Source: https://repository.rothamsted.ac.uk/item/8w172/the-importance-of-long-term-experiments-in-agriculture-their-management-to-ensure-continued-crop-production-and-soil-fertility-the-rothamsted-experience
Timestamp: 2019-04-24 06:00:17+00:00

Document:
Johnston, A. E. and Poulton, P. R.
Summary Long‐term field experiments that test a range of treatments and are intended to assess the sustainability of crop production, and thus food security, must be managed actively to identify any treatment that is failing to maintain or increase yields. Once identified, carefully considered changes can be made to the treatment or management, and if they are successful yields will change. If suitable changes cannot be made to an experiment to ensure its continued relevance to sustainable crop production, then it should be stopped. Long‐term experiments have many other uses. They provide a field resource and samples for research on plant and soil processes and properties, especially those properties where change occurs slowly and affects soil fertility. Archived samples of all inputs and outputs are an invaluable source of material for future research, and data from current and archived samples can be used to develop models to describe soil and plant processes. Such changes and uses in the Rothamsted experiments are described, and demonstrate that with the appropriate crop, soil and management, acceptable yields can be maintained for many years, with either organic manure or inorganic fertilizers. Highlights Long‐term experiments demonstrate sustainability and increases in crop yield when managed to optimize soil fertility. Shifting individual response curves into coincidence increases understanding of the factors involved. Changes in inorganic and organic pollutants in archived crop and soil samples are related to inputs over time. Models describing soil processes are developed from current and archived soil data.
Antille, D. L., Godwin, R. J., Sakrabani, R., Seneweera, S., Tyrrel, S. F. and Johnston, A. E. 2017. Field-scale evaluation of biosolids-derived organomineral fertilizers applied to winter wheat in England. Agronomy Journal. 109 (2), pp. 654-674.
Potassium fertilization: paradox or K management dilemma?
Bar-Yosef, B., Magen, H., Johnston, A. E. and Kirkby, E. A. 2015. Potassium fertilization: paradox or K management dilemma? Renewable Agriculture and Food Systems. 30, pp. 115-119.
Roberts, T. L. and Johnston, A. E. 2015. Phosphorus use efficiency and management in agriculture. Resources, Conservation and Recycling. 105, pp. 275-281.
Johnston, A. E. 2015. Review of an ADAS Report 'The agronomic case for polyhalite', dated 8 April 2014 (Report prepared for the North York Moors National Park Authority). North York Moors National Park Authority.
Johnston, A. E., Fixen, P. and Poulton, P. R. 2014. The efficient use of phosphorus in agriculture. IPNI.
Johnston, A. E., Poulton, P. R., Fixen, P. E. and Curtin, D. 2014. Phosphorus: its efficient use in agriculture. in: Sparks, D. L. (ed.) Advances in Agronomy Vol.123 Elsevier.
Poulton, P. R., Johnston, A. E. and White, Robin P. 2013. Plant-available soil phosphorus. Part I: the response of winter wheat and spring barley to Olsen P on a silty clay loam. Soil Use and Management. 29 (1), pp. 4-11.
Johnston, A. E., Poulton, P. R. and White, Robin P. 2013. Plant-available soil phosphorus. Part II: the response of arable crops to Olsen P on a sandy clay loam and a silty clay loam. Soil Use and Management. 29 (1), pp. 12-21.
Why are long-term experiments important?
Poulton, P. R. 2012. Why are long-term experiments important? Izvestiya Timiryazevskoi Sel'skokhozyaistvennoi Akademii. 3, pp. 36-45.
Johnston, A. E. and Curtin, D. 2012. Letter to the editors of Nutrient Cycling in Agroecosystems. Springer.
White, P. J., Broadley, M. R., Thompson, J. A., Mcnicol, J. W., Crawley, M. J., Poulton, P. R. and Johnston, A. E. 2012. Testing the distinctness of shoot ionomes of angiosperm families using the Rothamsted Park Grass Continuous Hay Experiment. New Phytologist. 196 (1), pp. 101-109.
Guntzer, F., Keller, C., Poulton, P. R., McGrath, S. P. and Meunier, J-D. 2012. Long-term removal of wheat straw decreases soil amorphous silica at Broadbalk, Rothamsted. Plant and Soil. 352 (1-2), pp. 173-184.
Stiehl-Braun, P. A., Powlson, D. S., Poulton, P. R. and Niklaus, P. A. 2011. Effects of N fertilizers and liming on the micro-scale distribution of soil methane assimilation in the long-term Park Grass experiment at Rothamsted. Soil Biology and Biochemistry. 43, pp. 1034-1041.
Fraser, R. A., Bogaard, A., Heaton, T., Charles, M., Jones, G., Christensen, B. T., Halstead, P., Merbach, I., Poulton, P. R., Sparkes, D. and Styring, A. K. 2011. Manuring and stable nitrogen isotope ratios in cereals and pulses: towards a new archaeobotanical approach to the inference of land use and dietary practices. Journal of Archaeological Science. 38, pp. 2790-2804.
Barre, P., Eglin, T., Christensen, B. T., Ciais, P., Houot, S., Katterer, T., Kogut, B., Van Oort, F., Peylin, P., Poulton, P. R., Romanenkov, V. and Chenu, C. 2011. Long-term bare fallow experiments: new opportunities for studying stable soil carbon. Agrokhimia. 12, pp. 28-36.
Johnston, A. E. and Poulton, P. R. 2011. Response of cereals to soil and fertilizer phosphorus (HGCA Research Review No. 74). Home Grown Cereals Authority (HGCA) Stoneleigh.
Barre, P., Eglin, T., Christensen, B. T., Ciais, P., Houot, S., Katterer, T., Van Oort, F., Peylin, P., Poulton, P. R., Romanenkov, V. and Chenu, C. 2010. Quantifying and isolating stable soil organic carbon using long-term bare fallow experiments. Biogeosciences. 7, pp. 3839-3850.
Silvertown, J., Tallowin, J. R. B., Stevens, C., Power, S. A., Morgan, V., Emmett, B., Hester, A., Grime, P. J., Morecroft, M., Buxton, R., Poulton, P. R., Jinks, R. and Bardgett, R. D. 2010. Environmental myopia: a diagnosis and a remedy. Trends in Ecology & Evolution. 25, pp. 556-561.
Kohler, I. H., Poulton, P. R., Auerswald, K. and Schnyder, H. 2010. Intrinsic water-use efficiency of temperate seminatural grassland has increased since 1857: an analysis of carbon isotope discrimination of herbage from the Park Grass Experiment. Global Change Biology. 16 (5), pp. 1531-1541.
Milford, G. F. J. and Johnston, A. E. 2009. Potassium and nitrogen interactions in crop production (Translation into Polish of Proceedings of the International Fertiliser Society No. 615).
Johnston, A. E. 2009. Potassium, magnesium and soil fertility: long term experimental evidence (Translation into Polish of Proceedings of the International Fertiliser Society No. 613).
Johnston, A. E. and Syers, J. K. 2009. A new approach to assessing phosphorus use efficiency in agriculture.
Tye, A. M., Kemp, S. J. and Poulton, P. R. 2009. Responses of soil clay mineralogy in the Rothamsted Classical Experiments in relation to management practice and changing land use. Geoderma. 153, pp. 136-146.
Atkinson, M. D., Kettlewell, P. S., Poulton, P. R. and Hollins, P. D. 2008. Grain quality in the Broadbalk Wheat Experiment and the winter North Atlantic Oscillation. The Journal of Agricultural Science. 146, pp. 541-549.
Syers, J. K., Johnston, A. E. and Curtin, D. 2008. Efficiency of soil and fertilizer phosphorus use: reconciling changing concepts of soil phosphorus behaviour with agronomic information (FAO Fertilizer and Plant Nutrition Bulletin 18). Food and Agriculture Organization of the United Nations (FAO), Rome, Italy.
Jenkinson, D. S., Poulton, P. R. and Bryant, C. 2008. The turnover of organic carbon in subsoils. Part 1. Natural and bomb radiocarbon in soil profiles from the Rothamsted long-term field experiments. European Journal of Soil Science. 59 (2), pp. 391-399.
Fan, M-S., Zhao, F-J., Poulton, P. R. and McGrath, S. P. 2008. Historical changes in the concentrations of selenium in soil and wheat grain from the Broadbalk experiment over the last 160 years. Science of the Total Environment. 389, pp. 532-538.
Milford, G. F. J. and Johnston, A. E. 2007. Potassium and nitrogen interactions in crop production (Proceedings of the International Fertiliser Society 615).
Bogaard, A., Heaton, T. H. E., Poulton, P. R. and Merbach, I. 2007. The impact of manuring on nitrogen isotope ratios in cereals: archaeological implications for reconstruction of diet and crop management practices. Journal of Archaeological Science. 34, pp. 335-343.
Senbayram, M., Poulton, P. R. and Jones, J. A. 2007. The influence of long term manure and ignoring fertiliser applications on plant and soil. Annual meeting, Stable Isotope Mass Spectrometry User Group (SIMSUG 2007), Newcastle University.
Johnston, A. E. 2006. Changes in understanding the behaviour of soil and fertiliser phosphorus: implications for their efficient use in agriculture : Paper presented to the International Fertiliser Society at a Conference in Cambridge, 14th December 2006.
Hassanin, A., Lee, R. G. M., Johnston, A. E. and Jones, K. C. 2006. Reductions and changing patterns of ambient PCDD/Fs in the UK: evidence and implications. Chemosphere. 65, pp. 530-539.
Blair, N., Faulkner, R. D., Till, A. R. and Poulton, P. R. 2006. Long-term management impacts on soil C, N and physical fertility. Part 1: Broadbalk experiment. Soil & Tillage Research. 91, pp. 30-38.
Stapleton, L. M., Laybourn-Parry, J., Poulton, P. R., Tye, A. M., West, H. M., Young, S. D. and Crout, N. M. J. 2006. Parsimonious modelling of nutrient fluxes for a terrestrial ecosystem on Svalbard. Biogeochemistry. 80, pp. 57-69.
Silvertown, J., Poulton, P. R., Johnston, A. E., Edwards, G., Heard, M. and Biss, P. M. 2006. The Park Grass Experiment 1856-2006: its contribution to ecology. Journal of Ecology. 94 (4), pp. 801-814.
Poulton, P. R. 2006. Rothamsted Research: guide to the classical and other long-term experiments, datasets and sample archive. Rothamsted Research, Harpenden.
Kettlewell, P. S., Easey, J., Stephenson, D. B. and Poulton, P. R. 2006. Soil moisture mediates association between the winter North Atlantic Oscillation and summer growth in the Park Grass Experiment. Proceedings of the Royal Society of London Series B Biological Sciences. 273, pp. 1149-1154.
Poulton, P. R. 2006. A celebration of 150 years of the Park Grass Experiment. Rothamsted Research, Harpenden.
Johnston, A. E. 2005. Phosphorus nutrition of arable crops. in: Sims, J. T. and Sharpley, A. N. (ed.) Phosphorus: agriculture and the environment&nbsp; ACSESS.
Scott, B. F., Spencer, C., Matin, J. W., Barra, R., Bootsma, H. A., Jones, K. C., Johnston, A. E. and Muir, D. C. G. 2005. Comparison of haloacetic acids in the environment of the northern and southern hemispheres. Environmental Science & Technology. 39, pp. 8664-8670.
Stapleton, L. M., Crout, N. M. J., Sawstrom, C., Marshall, W. A., Poulton, P. R., Tye, A. M. and Laybourn-Parry, J. 2005. Microbial carbon dynamics in nitrogen amended Arctic tundra soil: measurement and model testing. Soil Biology and Biochemistry. 37, pp. 2088-2098.
Tye, A. M., Young, S. D., Crout, N. M. J., West, H. M., Stapleton, L. M., Poulton, P. R. and Laybourn-Parry, J. 2005. The fate of 15N added to high Arctic tundra to mimic increased inputs of atmospheric nitrogen released from a melting snowpack. Global Change Biology. 11 (10), pp. 1640-1654.
Hassanin, A., Johnston, A. E., Thomas, G. O. and Jones, K. C. 2005. Time trends of atmospheric PBDEs inferred from archived U.K. herbage. Environmental Science & Technology. 39, pp. 2436-2441.
Stewart, W. M., Dibb, D. W., Johnston, A. E. and Smyth, T. J. 2005. The contribution of commercial fertilizer nutrients to food production. Agronomy Journal. 97, pp. 1-6.
Crawley, M. J., Johnston, A. E., Silvertown, J., Dodd, M., De Mazancourt, C., Heard, M. S., Henman, D. F. and Edwards, G. R. 2005. Determinants of species richness in the Park Grass Experiment. American Naturalist. 165, pp. 179-192.
Johnston, A. E. 2005. Lawes, John Bennet and Gilbert, Joseph Henry. Elsevier Academic Press, Amsterdam.
Micronutrients in soil and agrosystems: occurrence and availability.
Johnston, A. E. 2004. Micronutrients in soil and agrosystems: occurrence and availability.
Green, N. J. L., Hassanin, A., Johnston, A. E. and Jones, K. C. 2004. Observations on historical, contemporary, and natural PCDD/Fs. Environmental Science & Technology. 38, pp. 715-723.
Jenkinson, D. S., Poulton, P. R., Johnston, A. E. and Powlson, D. S. 2004. Turnover of nitrogen-15-labeled fertilizer in old grassland. Soil Science Society of America Journal. 68, pp. 865-875.
Poulton, P. R., Cracuin, I., Powlson, D. S. and Jenkinson, D. S. 2003. The influence of straw incorporation and soil type on the losses of soil inorganic nitrogen and its use by winter wheat. International Atomic Energy Agency, Vienna.
Johnston, A. E. 2003. Understanding potassium and its use in agriculture. Brussels, European Fertilizer Manufacturers Association.
Long-term experiments in the 21st century - continuity or change?
Johnston, A. E. 2003. Feed the soil to feed the people: the role of potash in sustainable agriculture. Proceedings of the IPI Golden Jubilee Congress 1952-2002, Basel, 8-10 October 2002. Volume 1. Invited papers. Inpernational Potash Institute, Basel.
Johnston, A. E. and Richards, I. R. 2003. Effectiveness of the water-insoluble component of triple superphosphate for yield and phosphorus uptake by plants. The Journal of Agricultural Science. 140, pp. 267-274.
Johnston, A. E. and Richards, I. R. 2003. Effectiveness of different precipitated phosphates as phosphorus sources for plants. Soil Use and Management. 19 (1), pp. 45-49.
Johnston, A. E. and Hollies, J. 2003. Soil analysis: it's interpretation and nutrient management practices.
Poulton, P. R., Pye, E., Hargreaves, P. R. and Jenkinson, D. S. 2003. Accumulation of carbon and nitrogen by old arable land reverting to woodland. Global Change Biology. 9 (6), pp. 942-955.
Kirchmann, H., Johnston, A. E. and Bergstrom, L. F. 2002. Possibilities for reducing nitrate leaching from agricultural land. Ambio. 31, pp. 404-408.
Kafkafi, U., Xu, G., Imas, P., Magen, H., Tarchitzky, J. and Johnston, A. E. 2002. Potassium and chloride in crops and soils: the role of potassium chloride fertilizer in crop nutrition (IPI Research Topics No. 22). International Potash Institute (IPI), Berne, Switzerland.
Johnston, A. E. and Steen, I. 2002. Understanding phosphorus and its use in agriculture. Brussels, European Fertilizer Manufacturers Association.
Meijer, S. N., Harner, T., Helm, P. A., Halsall, C. J., Johnston, A. E. and Jones, K. C. 2001. Polychlorinated naphthalenes in UK soils: Time trends, markers of source, and equilibrium status. Environmental Science & Technology. 35 (21), pp. 4205-4213.
Johnston, A. E. and Milford, G. F. J. 2001. The effect of nutrients in the subsoil on crop responses to applied potassium and phosphorus.
Johnston, A. E., Poulton, P. R., Dawson, C. J. and Crawley, M. J. 2001. Inputs of nutrients and lime for the maintenance of fertility of grassland soils.
Johnston, A. E. and Salter, J. L. 2001. Soil management for sustainable farming.
Harmer, R., Peterken, G., Kerr, G. and Poulton, P. R. 2001. Vegetation changes during 100 years of development of two secondary woodlands on abandoned arable land. Biological Conservation. 101, pp. 291-304.
Meijer, S. N., Halsall, C. J., Harner, T., Peters, A. J., Ockenden, W. A., Johnston, A. E. and Jones, K. C. 2001. Organochlorine pesticide residues in archived UK soil. Environmental Science & Technology. 35, pp. 1989-1995.
Johnston, A. E., Poulton, P. R. and Syers, J. K. 2001. Phosphorus, potassium and sulphur cycles in agricultural soils.
Green, N. J. L., Jones, J. L., Johnston, A. E. and Jones, K. C. 2001. Further evidence for the existence of PCDD/Fs in the environment prior to 1900. Environmental Science & Technology. 35, pp. 1974-1981.
Johnston, A. E. 2001. Principles of crop nutrition for sustainable food production.
Johnston, A. E. 2000. Soil and plant phosphate. Paris, International Fertilizer Industry Association.
Johnston, A. E. 2000. Some aspects of nitrogen use efficiency in arable agriculture.
Virtanen, R., Johnston, A. E., Crawley, M. J. and Edwards, G. R. 2000. Bryophyte biomass and species richness on the Park Grass Experiment, Rothamsted, UK. Plant Ecology. 151, pp. 129-141.
Johnston, A. E. 2000. Nitrogen mobility - a review.
Johnston, A. E. 2000. Efficient use of nutrients in agricultural production systems. Communications in Soil Science and Plant Analysis. 31, pp. 1599-1620.
Bull, I. D., Nott, C. J., Van Bergen, P. F., Poulton, P. R. and Evershed, R. P. 2000. Organic geochemical studies of soils from the Rothamsted classical experiments VI The occurrence and source of organic acids in an experimental grassland soil. Soil Biology and Biochemistry. 32, pp. 1367-1376.
Bull, I. D., Van Bergen, P. F., Nott, C. J., Poulton, P. R. and Evershed, R. P. 2000. Organic geochemical studies of soils from the Rothamsted Classical Experiments - V. The fate of lipids in different long-term soil experiments. Organic Geochemistry. 31, pp. 389-408.
Higgs, B., Johnston, A. E., Salter, J. L. and Dawson, C. J. 2000. Some aspects of achieving sustainable phosphorus use in agriculture. Journal of Environmental Quality. 29, pp. 80-87.
Response to comment on "Evidence for the presence of PCDD/Fs in the environment prior to 1900 and further studies on their temporal trends"
Alcock, R. E., Jones, K. C., Mclachlan, M. S. and Johnston, A. E. 1999. Response to comment on "Evidence for the presence of PCDD/Fs in the environment prior to 1900 and further studies on their temporal trends".
Chalmers, A. G., Renwick, A., Johnston, A. E. and Dawson, C. J. 1999. Design, development and use of a national survey of fertiliser applications.
Johnston, A. E. 1999. Essential Role of Potassium in Diverse Cropping Systems: Proceedings of Workshop C, 16th World Congress of Soil Science, Montpellier, 20-26 August 1998. International Potash Institute (IPI), Berne, Switzerland.
Blake, L. and Johnston, A. E. 1999. The retention and release of phosphorus from soil.
Are the Rothamsted experiments still relevant to modern farming?
Tilman, E. A., Tilman, D., Crawley, M. J. and Johnston, A. E. 1999. Biological weed control via nutrient competition: potassium limitation of dandelions. Ecological Applications. 9 (1), pp. 103-111.
Johnston, A. E. 1998. Food security in the WANA region, the essential need for balanced fertilization. Proceedings of a Regional Workshop of the International Potash Institute, Bornova, Izmir, Turkey, 26-30 May 1997. International Potash Institute (IPI), Berne, Switzerland.
Poulton, P. R. 1998. The effectiveness of nitrogen derived from organic matter; results from long-term experiments. Proceedings Conference on New Concepts on Plant Nutrition Acquisition, Tsukuba, Japan, March 1998 .
Van Bergen, P. F., Nott, C. J., Bull, I. D., Poulton, P. R. and Evershed, R. P. 1998. Organic geochemical studies of soils from the Rothamsted Classical Experiments - IV. Preliminary results from a study of the effect of soil pH on organic matter decay. Organic Geochemistry. 29, pp. 1779-1795.
Johnston, A. E. Syers, J. K. (ed.) 1998. Nutrient management for sustainable crop production in Asia. CABI International, Wallingford, Oxon (CABI).
Zhao, F-J., Spiro, B., Poulton, P. R. and McGrath, S. P. 1998. Use of sulfur isotope ratios to determine anthropogenic sulfur signals in a grassland ecosystem. Environmental Science & Technology. 32, pp. 2288-2291.
Is exchangeable K a sufficient guide for K recommendations?
Johnston, A. E. and Krauss, A. 1998. Is exchangeable K a sufficient guide for K recommendations? Proceedings 16th World Congress of Soil Science, Montpellier, 20-26 August 1998 .
Alcock, R. E., Mclachlan, M. S., Johnston, A. E. and Jones, K. C. 1998. Evidence for the presence of PCDD/Fs in the environment prior to 1900 and further studies on their temporal trends. Environmental Science & Technology. 32 (11), pp. 1580-1587.
Wakefield, J. A., Poulton, P. R., Murphy, D. V. and Webster, C. P. 1998. The effect of long-term fertilizer nitrogen and farmyard manure on soluble forms of nitrogen in the soil. Abstracts British Society for Soil Science Down to Earth Conference, University of Reading, 31 March-1 April 1998 .
Powlson, D. S. and Poulton, P. R. 1998. Using long-term experiments at Rothamsted to address current agricultural and environmental issues. Archiv fur Acker- und Pflanzenbau und Bodenkunde. 42 (6), pp. 455-478.
Bull, I. D., Van Bergen, P. F., Poulton, P. R. and Evershed, R. P. 1998. Organic geochemical studies of soils from the Rothamsted Classical Experiments II: soils from the Hoosfield Spring Barley experiment treated with different quantities of manure. Organic Geochemistry. 28 (1-2), pp. 11-26.
Molina, J. A. E., Crocker, G. J., Grace, P. R., Klir, J., Korschens, M., Poulton, P. R. and Richter, D. D. 1997. Simulating trends in soil organic carbon in long-term experiments using the NCSOIL and NCSWAP models. Geoderma. 81, pp. 91-107.
Kelly, R. H., Parton, W. J., Crocker, G. J., Grace, P. R., Klir, J., Korschens, M., Poulton, P. R. and Richter, D. D. 1997. Simulating trends in soil organic carbon in long-term experiments using the century model. Geoderma. 81, pp. 75-90.
Jensen, L. S., Mueller, T., Nielsen, N. E., Hansen, S., Crocker, G. J., Grace, P. R., Klir, J., Korschens, M. and Poulton, P. R. 1997. Simulating trends in soil organic carbon in long-term experiments using the soil-plant-atmosphere model DAISY. Geoderma. 81, pp. 5-28.
Franko, U., Crocker, G. J., Grace, P. R., Klir, J., Korschens, M., Poulton, P. R. and Richter, D. D. 1997. Simulating trends in soil organic carbon in long-term experiments using the CANDY model. Geoderma. 81, pp. 109-120.
Chertov, O. G., Komarov, A. S., Crocker, G., Grace, P., Klir, J., Korschens, M., Poulton, P. R. and Richter, D. 1997. Simulating trends of soil organic carbon in seven long-term experiments using the SOMM model of the humus types. Geoderma. 81, pp. 121-135.
Changsheng, L., Frolking, S., Crocker, G. J., Grace, P. R., Klir, J., Korschens, M. and Poulton, P. R. 1997. Simulating trends in soil organic carbon in long-term experiments using the DNDC model. Geoderma. 81, pp. 45-60.
Arah, J. R. M., Thornley, J. H. M., Poulton, P. R. and Richter, D. D. 1997. Simulating trends in soil organic carbon in long-term experiments using the ITE (Edinburgh) Forest and Hurley pasture ecosystem models. Geoderma. 81, pp. 61-74.
Van Bergen, P. F., Poulton, P. R. and Evershed, R. P. 1997. Nitrogen-containing macromolecular moieties in soil organic matter.
Johnston, A. E. 1997. Fertilisers and agriculture: fifty years of developments and challenges.
Van Bergen, P. F., Bull, I. D., Poulton, P. R. and Evershed, R. P. 1997. Organic geochemical studies of soils from the Rothamsted Classical experiments. I. Total lipid extracts, solvent insoluble residues and humic acids from Broadbalk Wilderness. Organic Geochemistry. 26 (1-2), pp. 117-135.
Jackson, A. M., Poulton, P. R. and Ball, A. S. 1997. Importance of farming practice on the isolation frequency of Thermoactinomyces species. Soil Biology and Biochemistry. 29, pp. 207-210.
Johnston, A. E. 1997. The value of long-term field experiments in agricultural, ecological and environmental research. in: Sparks, D. L. (ed.) Advances in Agronomy (Vol. 59) Elsevier.
Johnston, A. E. 1996. Phosphorus: essential plant nutrient, possible pollutant.
Mepham, N., Poulton, P. R. and Murphy, D. V. 1996. Application of 15N labelled materials to soil research. Abstracts Stable Isotope Mass Spectrometry Users Group 2nd Annual Conference (SIMSUG '96), Llandudno, 10-12 Januery 1996 .
Poulton, P. R. 1996. Woburn Ley-Arable. GCTE Focus 3 Office, Wallingford.
Poulton, P. R. 1996. Park Grass. GCTE Focus 3 Office, Wallingford.
Poulton, P. R. 1996. Hoosfield Continuous Barley. GCTE Focus 3 Office, Wallingford.
Poulton, P. R. 1996. Geescroft Wilderness. GCTE Focus 3 Office, Wallingford.
Poulton, P. R. 1996. Broadbalk Wheat Experiment. GCTE Focus 3 Office, Wallingford.
A polymorphism for phosphate uptake/arsenate tolerance in Holcus lanatus L.: is there a correlation with edaphic or environmental factors?
Naylor, J., Macnair, M. R., Williams, E. N. D. and Poulton, P. R. 1996. A polymorphism for phosphate uptake/arsenate tolerance in Holcus lanatus L.: is there a correlation with edaphic or environmental factors? Heredity. 77, pp. 509-517.
Poulton, P. R. 1996. Management and modification procedures for long-term field experiments. Canadian Journal of Plant Science. 76, pp. 587-594.
The Rothamsted long-term experiments: are they still relevant?
Poulton, P. R. 1996. The Rothamsted long-term experiments: are they still relevant? Canadian Journal of Plant Science. 76, pp. 559-571.
Bacon, J. R., Jones, K. C., McGrath, S. P. and Johnston, A. E. 1996. Isotopic character of lead deposited from the atmosphere at a grassland site in the UK since 1860. Environmental Science & Technology. 30, pp. 2511-2518.
Kjeller, L. O., Jones, K. C., Johnston, A. E. and Rappe, C. 1996. Evidence for a decline in atmospheric emissions of PCDD/Fs in the UK. Environmental Science & Technology. 30 (4), pp. 1398-1403.
Alcock, R. E., Lead, W. A., Johnston, A. E. and Jones, K. C. 1995. Are polychlorinated biphenyls produced naturally? Results from recent UK investigations. in: Grimvall, A. and de Leer, E. W. B. (ed.) Naturally-produced organo-halogens: Selected and edited proceedings of the First Conference on Naturally-Produced Organohalogens&nbsp; Dordrecht, Netherlands, Springer Science.
Beck, A. J., Lam, V., Henderson, D. E., Beven, K. J., Harris, G. L., Howse, K. R., Johnston, A. E. and Jones, K. C. 1995. Movement of water and the herbicides atrazine and isoproturon through a large structured clay soil core. Journal of Contaminant Hydrology. 19, pp. 237-260.
Nicholson, F. A., Jones, K. C. and Johnston, A. E. 1995. The Significance of the Retention of Atmospherically Deposited Cadmium on Plant-Surfaces to the Cadmium Content of Herbage. Chemosphere. 31 (4), pp. 3043-3049.
Poulton, P. R. 1995. The importance of long-term field trials in understanding sustainable farming systems: the Rothamsted experience. Australian Journal of Experimental Agriculture. 35, pp. 825-834.
Webster, G., Poulton, P. R., Cocking, E. C. and Davey, M. R. 1995. The nodulation of micro-propagated plants of Parasponia andersonii by tropical legume rhizobia. Journal of Experimental Botany. 46, pp. 1131-1137.
Jones, K. C., Johnston, A. E. and McGrath, S. P. 1995. The importance of long- and short-term air-soil exchanges of organic contaminants. International Journal of Environmental Analytical Chemistry. 59, pp. 167-178.
Johnston, A. E. and Jones, K. C. 1995. The origin and fate of cadmium in soil.
Beck, A. J., Harris, G. L., Howse, K. R., Johnston, A. E. and Jones, K. C. 1995. Effect of crop residue management and drainage on the persistence and movement of Isoproturon in a structured clay soil over the growing season of a winter barley crop. Journal of Agricultural and Food Chemistry. 43, pp. 1368-1376.
Poulton, P. R. and Johnston, A. E. 1994. The Rothamsted Classical Experiments. Agrokemia es Talajtan. 43, pp. 249-263.
Johnston, A. E. 1994. The role of nitrogen in crop production and losses of nitrate by leaching from agricultural soil. Marine Pollution Bulletin. 29, pp. 414-419.
Alcock, R. E., Halsall, C. J., Harris, C. A., Johnston, A. E., Lead, W. A., Sanders, G. and Jones, K. C. 1994. Contamination of environmental samples prepared for PCB analysis. Environmental Science & Technology. 28 (11), pp. 1838-1842.
Nicholson, F. A., Jones, K. C. and Johnston, A. E. 1994. Effect of phosphate fertilisers and atmospheric deposition on long-term changes in the cadmium content of soils and crops. Environmental Science & Technology. 28 (12), pp. 2170-2175.
Johnston, A. E., McEwen, J., Lane, P. W., Hewitt, M. V., Poulton, P. R. and Yeoman, D. P. 1994. Effects of one to six year old ryegrass-clover leys on soil nitrogen and on the subsequent yields and fertilizer nitrogen requirements of the arable sequence winter wheat, potatoes, winter wheat, winter beans (Vicia faba ) grown on a sandy loam soil. The Journal of Agricultural Science. 122 (1), pp. 73-89.
McGrath, S. P., Hall, J. E., Lopez-Real, J. M., Lee, H., Chambers, B. J., Smith, K., Stevens, R. J., Hadley, P., Smith, S., Pickering, J., Kendle, T., Allison, M. F., Johnston, A. E. and Prew, B. D. 1993. SCI Agriculture and Environment Group symposium: use and value of organic materials in agriculture. Journal of the Science of Food and Agriculture. 63 (1), pp. 97-102.
Hart, P. B. S., Powlson, D. S., Poulton, P. R., Johnston, A. E. and Jenkinson, D. S. 1993. The availability of the nitrogen in the crop residues of winter wheat to subsequent crops. The Journal of Agricultural Science. 121 (3), pp. 355-362.
Beck. A. J., Johnston, A. E. and Jones, K. C. 1993. Movement of nonionic organic chemicals in agricultural soils. Critical Reviews in Environmental Science and Technology. 23, pp. 219-248.
Alcock, R. E., Johnston, A. E., McGrath, S. P., Berrow, M. L. and Jones, K. C. 1993. Long-term changes in the polychlorinated biphenyl content of United Kingdom soils. Environmental Science & Technology. 27, pp. 1918-1923.
Zhao, F-J., McGrath, S. P. and Poulton, P. R. 1993. Long-term changes of soil sulphur status and plant sulphur uptake in the Park Grass Experiment, Rothamsted. Insight from Foresight. Abstracts Rothamsted 150th Anniversary Conference, Harpenden, July 1993 .
Jones, K. C., Johnston, A. E. and McGrath, S. P. 1993. Long-term monitoring of pollutants in soils. Insight from Foresight. Abstracts Rothamsted 150th Anniversary Conference, Harpenden, July 1993 .
Johnston, A. E. 1993. The Rothamsted "Classical" Experiments. Insight from Foresight. Abstracts Rothamsted 150th Anniversary Conference, Harpenden, July 1993 .
Johnston, A. E. and Jones, K. C. 1992. The cadmium issue - long-term changes in the cadmium content of soils and the crops grown on them", International Workshop on phosphate fertilizers and the environment. Mar 23-27, 1992 Tampa, Florida, USA.
Jones, K. C., Jackson, A. and Johnston, A. E. 1992. Evidence for an increase in the cadmium content of herbage since the 1860s. Environmental Science & Technology. 26 (4), pp. 834-836.
Jones, K. C., Sanders, G., Wild, S. R., Burnett, V. and Johnston, A. E. 1992. Evidence for a decline of PCBs and PAHs in rural vegetation and air in the United Kingdom. Nature. 356 (6365), pp. 137-140.
Wild, S. R., Jones, K. C. and Johnston, A. E. 1992. The polynuclear aromatic hydrocarbon (PAH) content of herbage from a long-term grassland experiment. Atmospheric Environment. 26A, pp. 1299-1307.
Powlson, D. S., Hart, P. B. S., Poulton, P. R., Johnston, A. E. and Jenkinson, D. S. 1992. Influence of soil type, crop management and weather on the recovery of 15N-labelled fertilizer applied to winter wheat in spring. The Journal of Agricultural Science. 118 (1), pp. 83-100.
Johnston, A. E. 1991. Organic matter/mineral matter in the context of clean technology. Seminar on Agriculture and Aquaculture: Environment Northern Seas Conference Report.
Kjeller, L-O., Jones, K. C., Johnston, A. E. and Rappe, C. 1991. Increases in the polychlorinated dibenzo-p-dioxin and -furan content of soils and vegetation since the 1840s. Environmental Science & Technology. 25 (9), pp. 1619-1627.
Johnston, A. E. 1991. Potential changes in soil fertility from arable farming including organic systems.
Jones, K. C. and Johnston, A. E. 1991. Significance of atmospheric inputs of lead to grassland at one site in the United Kingdom since 1860. Environmental Science & Technology. 25 (6), pp. 1174-1178.
Evidence for a decline in rural herbage lead levels in the U.K.
Jones, K. C., Symon, C., Taylor, P. J. L., Walsh, J. and Johnston, A. E. 1991. Evidence for a decline in rural herbage lead levels in the U.K. Atmospheric Environment. 25 (2), pp. 361-369.
Soil fertility-how can we define it in intensive agricultural systems?
Johnston, A. E. 1990. North European outlook of plant nutrition guidelines - experience in the UK. Seminar 191, Nordiska Jordbruksforskares Forening, Sigtuna, Sweden, 1990.
Straw incorporation - its effects on soil fertility.
Johnston, A. E. 1990. Straw incorporation - its effects on soil fertility. Straw disposal and soil management after 1992. Proceedings Lincolnshire Agricultural Society, November, 1990. pp. 1-10.
Low input agriculture - is it sustainable?
Johnston, A. E. 1990. Low input agriculture - is it sustainable? Journal of the Fertilizer Society of South Africa .
The nitrogen cycle in UK arable agriculture.
Johnston, A. E. and Jenkinson, D. S. 1989. The nitrogen cycle in UK arable agriculture.
The role of nitrogen in agriculture.
Leaching of nitrate from soils receiving organic or inorganic fertilizers continuously for 135 years.
Accumulation and loss of nitrogen from manure, sludge and compost: long-term experiments at Rothamsted and Woburn.
Ways of overcoming constraints to reduced tillage; effect of changing straw disposal on soil nitrogen.
Benefits from long-term ecological research; some examples from Rothamsted.
Uptake of foliar-applied urea by winter-wheat (Triticum aestivum ): the influence of application time and the use of a new 15N technique.
Powlson, D. S., Poulton, P. R., Moller, N. E., Hewitt, M. V., Penny, A. and Jenkinson, D. S. 1989. Uptake of foliar-applied urea by winter-wheat (Triticum aestivum ): the influence of application time and the use of a new 15N technique. Journal of the Science of Food and Agriculture. 48 (4), pp. 429-440.
Cadmium in cereal grain and herbage from long-term experimental plots at Rothamsted, UK.
Jones, K. C. and Johnston, A. E. 1989. Cadmium in cereal grain and herbage from long-term experimental plots at Rothamsted, UK. Environmental Pollution. 57 (3), pp. 199-216.
Unused fertiliser nitrogen in arable soils - its contribution to nitrate leaching.
Mcdonald, A. J., Powlson, D. S., Poulton, P. R. and Jenkinson, D. S. 1989. Unused fertiliser nitrogen in arable soils - its contribution to nitrate leaching. Journal of the Science of Food and Agriculture. 46 (4), pp. 407-419.
Polynuclear aromatic hydrocarbons in an agricultural soil: long term changes in profile distribution.
Jones, K. C., Stratford, J. A., Tidridge, P., Waterhouse, K. S. and Johnston, A. E. 1989. Polynuclear aromatic hydrocarbons in an agricultural soil: long term changes in profile distribution. Environmental Pollution. 56, pp. 337-351.
Phosphorus cycling in intensive arable agriculture.
Changes in the polynuclear aromatic hydrocarbon content of wheat grain and pasture grassland over the last century from one site in the UK.
Jones, K. C., Grimmer, G., Jacob, J. and Johnston, A. E. 1989. Changes in the polynuclear aromatic hydrocarbon content of wheat grain and pasture grassland over the last century from one site in the UK. Science of the Total Environment. 78, pp. 117-130.
Jones, K. C., Stratford, J. A., Waterhouse, K. S., Furlong, E. T., Giger, W., Hites, R. A., Schaffner, C. and Johnston, A. E. 1989. Increases in the polynuclear aromatic hydrocarbon content of an agricultural soil over the last century. Environmental Science & Technology. 23, pp. 95-101.
Johnston, A. E. 1988. Rothamsted and the nitrogen story.
Johnston, A. E. 1988. A Rothamsted view of nitrogen management.
Johnston, A. E. 1988. The value of long-term experiments - a personal view. in: Long-term studies in ecology : approaches and alternatives. Ed. G.E. Likens.
Johnston, A. E. 1988. Kaliumdungung zur Aufrechterhaltung eines ausgeglichenen K-Versorgungsgrades unter verschiedenen Anbausystemen.
Johnston, A. E. 1987. Saxmundham Experimental Station 1899-1986 A review of the achievements during 1965-1986. Rothamsted Experimental Station Report.
Effects of soil organic matter on yields of crops in long-term experiments at Rothamsted and Woburn.
Johnston, A. E. 1987. Effects of soil organic matter on yields of crops in long-term experiments at Rothamsted and Woburn.
Retrospective analysis of an archived soil collection. I. Metals.
Jones, K. C., Symon, C. J. and Johnston, A. E. 1987. Retrospective analysis of an archived soil collection. I. Metals. Science of the Total Environment. 61, pp. 131-144.
Recovery of 15N-labelled urea applied to the foliage of winter wheat.
Powlson, D. S., Poulton, P. R., Penny, A. and Hewitt, M. V. 1987. Recovery of 15N-labelled urea applied to the foliage of winter wheat. Journal of the Science of Food and Agriculture. 41 (3), pp. 195-203.
Retrospective analysis of an archived soil collection. II. Cadmium.
Jones, K., Symon, C. J. and Johnston, A. E. 1987. Retrospective analysis of an archived soil collection. II. Cadmium. Science of the Total Environment. 67, pp. 75-89.
Will Europe return to fallowing?
Johnston, A. E. 1987. Will Europe return to fallowing?
Johnston, A. E. 1987. Reducing nitrate pollution.
Straw incorporation and its implications for crop protection and wildlife.
Johnston, A. E., Smith, B. and Patterson, D. 1987. Straw incorporation and its implications for crop protection and wildlife.
McGrath, S. P. and Johnston, A. E. 1987. Le soufre en Grande-Bretagne.
Nitrogen - maximising benefits and minimising problems.
Johnston, A. E. 1987. Nitrogen - maximising benefits and minimising problems. Royal Agricultural Society of England (RASE), Stoneleigh.
Jones, K. C., Symon, C. J. and Johnston, A. E. 1986. Cadmium : temporal trends in archived soils from a semi-rural location in the UK In: Chemicals in the environment ed. J.M. Lester, R. Perry and, R.M. Sterritt, 553-559.
Powlson, D. S., Pruden, G., Johnston, A. E. and Jenkinson, D. S. 1986. The nitrogen cycle in the Broadbalk Wheat Experiment : recovery and losses of 15N-labelled fertilizer applied in spring and inputs of nitrogen from the atmosphere. The Journal of Agricultural Science. 107 (3), pp. 591-609.
The nitrogen cycle under continuous wheat.
Jenkinson, D. S., Powlson, D. S. and Johnston, A. E. 1986. The nitrogen cycle under continuous wheat.
AFRC Research on straw disposal.
Johnston, A. E. 1986. AFRC Research on straw disposal.
Phosphate fertilisers - is water solubility important?
Copestake, K. G., Johnston, A. E., Paulson, G. A. and Richards, I. R. 1986. Phosphate fertilisers - is water solubility important? Journal of the Science of Food and Agriculture. 37 (1), pp. 18-19.
Modelling the long-term residual effects of phosphorus residues in soil.
Johnston, A. E., Poulton, P. R. and Lane, P. 1986. Modelling the long-term residual effects of phosphorus residues in soil. Journal of the Science of Food and Agriculture. 37 (1), p. 8.
Cadmium accumulation in soils from long-continued applications of superphosphate.
Rothbaum, H. P., Goguel, R. L., Johnston, A. E. and Mattingly, G. E. G. 1986. Cadmium accumulation in soils from long-continued applications of superphosphate. Journal of Soil Science. 37 (1), pp. 99-107.
Soil organic matter, effects on soils and crops.
Johnston, A. E. 1986. Soil organic matter, effects on soils and crops. Soil Use and Management. 2 (3), pp. 97-105.
Sulphur - crop nutrient and fungicide.
McGrath, S. P. and Johnston, A. E. 1986. Sulphur - crop nutrient and fungicide.
Johnston, A. E., Lane, P. W., Mattingly, G. E. G., Poulton, P. R. and Hewitt, M. V. 1986. Effects of soil and fertilizer P on yields of potatoes, sugar beet, barley and winter wheat on a sandy clay loam soil at Saxmundham, Suffolk. The Journal of Agricultural Science. 106 (1), pp. 155-167.
McEwen, J. and Johnston, A. E. 1985. Yield and nitrogen-fixation of melilotus-alba. Field Crops Research. 12 (2), pp. 187-188.
The effect of straw incorporation on the uptake of nitrogen by winter wheat.
Powlson, D. S., Jenkinson, D. S., Pruden, G. and Johnston, A. E. 1985. The effect of straw incorporation on the uptake of nitrogen by winter wheat. Journal of the Science of Food and Agriculture. 36 (1), pp. 26-30.
McEwen, J., Johnston, A. E., Poulton, P. R. and Yeoman, D. P. 1984. Rothamsted Garden Clover - Red clover grown continuously since 1854 Yields, crop and soil analyses. Rothamsted Experimental Station Report. 2, pp. 225-237.
Dyke, G. V., George, B. J., Johnston, A. E., Poulton, P. R. and Todd, A. D. 1983. The Broadbalk wheat experiment 1968-78 : yields and plant nutrients in crops grown continuously and in rotation. Rothamsted Experimental Station, Harpenden.
McEwen, J., Johnston, A. E., Poulton, P. R. and Yeoman, D. P. 1983. Rothamsted garden clover - red clover grown continuously since 1854. Rothamsted Experimental Station Report. 2, pp. 225-237.
Dyke, G. V., George, B. J., Johnston, A. E., Poulton, P. R. and Todd, A. D. 1982. The Broadbalk wheat experiment 1968-78 : yields and plant nutrients in crops grown continuously and in rotation. Rothamsted Experimental Station Report. 2, pp. 5-44.
Lawlor, D. W., Day, W., Johnston, A. E., Legg, B. J. and Parkinson, K. J. 1981. Growth of spring barley under drought - crop development, photosynthesis, dry-matter accumulation and nutrient content. The Journal of Agricultural Science. 96 (FEB), pp. 167-186.
Johnston, A. E. 1981. Agricultural use of lime. Journal of the Science of Food and Agriculture. 32 (10), pp. 991-992.
Johnston, A. E. and Whinham, W. N. 1980. The use of lime on agricultural soils. Proceedings of the Fertiliser Society. 189, pp. 3-31.
Johnston, A. E., Poulton, P. R. and McEwen, J. 1980. Soils of rothamsted farm. The carbon and nitrogen content of the soils and the effect of changes in crop rotation and manuring on soil Ph, P, K and Mg. Rothamsted Experimental Station Report. 2, pp. 5-20.
Johnston, A. E. 1980. Release of potassium as measured in field experiments. Journal of the Science of Food and Agriculture. 31 (10), pp. 1078-1078.
Widdowson, F. V., Johnston, A. E. and Penny, A. 1980. Multifactorial experimentation on continuous winter-wheat grown in sandy clay soil at Saxmundham, Suffolk. The Journal of Agricultural Science. 94 (FEB), pp. 155-170.
Johnston, A. E., Poulton, P. R. and Williams, R. J. B. 1979. Results from an experiment on all-grass and grass-clover leys at Saxmundham, 1969-76, and changes in soil pH nitrogen, phosphorus and potassium due to cropping and manuring. Rothamsted Experimental Station Report. 2, pp. 99-117.
Rothbaum, H. P., McGaveston, D. A., Wall, T., Johnston, A. E. and Mattingly, G. E. G. 1979. Uranium accumulation in soils from long-continued applications of super-phosphate. Journal of Soil Science. 30 (1), pp. 147-153.
McEwen, J. and Johnston, A. E. 1979. Effects of subsoiling and deep incorporation of p-fertilizers and k-fertilizers on the yield and nutrient-uptake of barley, potatoes, wheat and sugar-beet grown in rotation. The Journal of Agricultural Science. 92 (JUN), pp. 695-702.
Johnston, A. E. 1979. Effect of soil improvers on seedling emergence, early growth and final yield. Journal of the Science of Food and Agriculture. 30 (3), pp. 338-338.
Day, W., Legg, B. J., French, B. K., Johnston, A. E., Lawlor, D. W. and Jeffers, W. D. C. 1978. Drought experiment using mobile shelters - effect of drought on barley yield, water-use and nutrient-uptake. The Journal of Agricultural Science. 91 (DEC), pp. 599-623.
Jenkinson, D. S. and Johnston, A. E. 1977. Soil organic matter in the Hoosfield continuous barley experiment. Rothamsted Experimental Station Report. 2, pp. 87-101.
Johnston, A. E. and Poulton, P. R. 1977. Yields on the Exhaustion Land and changes in NPK content of the soils due to cropping and manuring, 1852-1975. Rothamsted Experimental Station Report. 2, pp. 53-85.
Johnston, A. E., Mattingly, G. E. G. and Poulton, P. R. 1976. Effect of phosphate residues on soil phosphorus values and crop yields. I. Experiments on barley, potatoes and sugar beet on sandy loam soils at Woburn England. Rothamsted Experimental Station Report. 1975 (2), pp. 5-35.
Johnston, A. E. 1976. Additions and removals of nitrogen and phosphorus in long-term experiments at Rothamsted and Woburn and the effect of the residues on total soil nitrogen and phosphorus [wheat, barley, England]. Technical Bulletin Ministry of Agriculture Fisheries and Food.
Johnston, A. E. 1976. Some factors affecting crop response to soil-phosphorus. Journal of the Science of Food and Agriculture. 27 (6), pp. 590-590.
Thurston, J. M., Williams, E. D. and Johnston, A. E. 1976. Modern developments in an experiment on permanent grassland started in 1856 - effects of fertilizers and lime on botanical composition and crop and soil analyses. Annales Agronomiques. 27 (5-6), pp. 1043-1082.
Mattingly, G. E. G. and Johnston, A. E. 1976. Long-term rotation experiments at Rothamsted and Saxmundham-Experimental-Stations - effects of treatments on crop yields and soil analyses and recent modifications in purpose and design. Annales Agronomiques. 27 (5-6), pp. 743-769.
Johnston, A. E. and Mattingly, G. E. G. 1976. Experiments on continuous growth of arable crops at Rothamsted and Woburn-Experimental-Stations - effects of treatments on crop yields and soil analyses and recent modifications in purpose and design. Annales Agronomiques. 27 (5-6), pp. 927-956.
Johnston, A. E. 1975. Woburn Experimental Farm: a hundred years of agricultural research. Journal of the Royal Agricultural Society of England. 138, pp. 18-26.
Addiscott, T. M. and Johnston, A. E. 1975. Potassium in soils under different cropping systems, 3. Non-exchangeable potassium in soils from long-term experiments at Rothamsted and Woburn. Journal of Agricultural Science. 84, pp. 513-524.
Johnston, A. E. 1975. Experiments made on Stackyard Field, Woburn, 1876-1974. I. History of the Field, Details of the Cropping and Manuring and the Yields in the Continuous Wheat and Barley Experiments. Rothamsted Experimental Station Report. 2, pp. 29-44.
Johnston, A. E. 1975. The Woburn Market Garden experiment, 1942-1969. II: The effect of the treatments on soil pH, soil carbon, nitrogen, phosphorus and potassium. Rothamsted Experimental Station Report. 2, pp. 102-132.
Johnston, A. E. and Chater, M. 1975. Experiments made on Stackyard Field, Woburn, 1876-1974. II. Effects of treatments on soil pH, P and K in the Continuous Wheat and Barley Experiments. Rothamsted Experimental Station Report. 2, pp. 45-60.
Johnston, A. E. and Wedderburn, R. W. M. 1975. The Woburn Market Garden experiment 1942-1969 I. A history of the experiment, details of the treatments and yields of the crops. Rothamsted Experimental Station Report. 2, pp. 79-101.
Mattingly, G. E. G., Chater, M. and Johnston, A. E. 1975. Experiments made on Stackyard Field, Woburn, 1876-1974. III. Effects of NPK Fertilisers and Farmyard Manure on Soil Carbon, Nitrogen and Organic Phosphorus. Rothamsted Experimental Station Report. 1974 (2), pp. 61-77.
Addiscott, T. M. and Johnston, A. E. 1975. Potassium in soils under different cropping systems 3. Non-exchangeable potassium in soils from long-term experiments at Rothamsted and Woburn. The Journal of Agricultural Science. 84, pp. 513-524.
Mattingly, G. E. G., Chater, M. and Poulton, P. R. 1974. The Woburn Organic Manuring Experiment II. Soil Analyses, 1964-72, With Special Reference to Changes in Carbon and Nitrogen. Report - Agricultural Research Council and Ministry of Agriculture Rothamsted Experimental Station. 1973 (2), pp. 134-151.
Johnston, A. E. and Mitchell, J. D. 1974. The behaviour of K remaining in soils from the Agdell experiment at Rothamsted, the results of intensive cropping in pot experiments and their relation to soil analysis and the results of field experiments. Rothamsted Experimental Station Report. 2, pp. 74-94.
Johnston, A. E. 1973. Th effects of ley arable systems of farming on soil potassium reserves - Report from potassium systems of grassland farming. Lawes Agricultural Trust, (LAT) Harpenden.
Johnston, A. E. 1972. Changes in soil properties caused by the new liming scheme on Park Grass. Rothamsted Experimental Station Report. 2, pp. 177-180.
Johnston, A. E. and Penny, A. 1972. The Agdell experiment. Rothamsted Experimental Station Report. 2, pp. 38-68.
Johnston, A. E. 1972. The effects of ley and arable cropping systems on the amounts of soil organic matter in the Rothamsted and Woburn ley-arable experiment. Rothamsted Experimental Station Report. 2, pp. 131-159.
Johnston, A. E. 1971. Potassium residues in soils from experiments at Rothamsted and Woburn. Technical Bulletin Ministry of Agriculture Fisheries and Food. 20.
Johnston, A. E. and Addiscott, T. M. 1971. Potassium in soils under different cropping systems:1. Behaviour of K remaining in soils from classical and rotation experiments at Rothamsted and Woburn and evaluation of methods of measuring soil potassium. The Journal of Agricultural Science. 76 (3), pp. 539-552.
Addiscott, T. M. and Johnston, A. E. 1971. Potassium in soils under different cropping systems. 2. The effects of cropping systems on the retention by the soils of added K not used by crops. The Journal of Agricultural Science. 76, pp. 553-561.
Johnston, A. E. 1970. The value of residues from long-period manuring at Rothamsted and Woburn I A summary of the results of experiments started by Lawes and Gilbert. Rothamsted Experimental Station Report. 2, pp. 5-6.
Johnston, A. E. 1970. The value of residues from long-period manuring at Rothamsted and Woburn II A summary of the results of experiments started by Lawes and Gilbert. Rothamsted Experimental Station Report. 2, pp. 7-21.
Johnston, A. E. and Warren, R. G. 1970. The value of residues from long-period manuring at Rothamsted and Woburn III The experiments made from 1957 to 1962, the soils and histories of the sites on which they were made. Rothamsted Experimental Station Report. 2 (2), pp. 22-38.
Johnston, A. E., Warren, R. G. and Penny, A. 1970. The value of residues from long-period manuring at Rothamsted and Woburn IV The value to arable crops of residues accumulated from superphosphate. Rothamsted Experimental Station Report. 2, pp. 39-68.
Johnston, A. E., Warren, R. G. and Penny, A. 1970. The value of residues from long-period manuring at Rothamsted and Woburn V The value to arable crops of residues accumulated from potassium fertilizers. Rothamsted Experimental Station Report. 2, pp. 69-90.
Mattingly, G. E. G., Johnston, A. E. and Chater, M. 1970. The residual value of farmyard manure and superphosphate in the Saxmundham Rotation II Experiment, 1899-1968. Rothamsted Experimental Station Report. 2, pp. 91-112.
Johnston, A. E. 1969. The plant nutrients in crops grown on Broadbalk.
Johnston, A. E. 1969. The soils of Broadbalk : Plant nutrients in Broadbalk soils. Rothamsted Experimental Station Report. 2, pp. 93-115.
Johnston, A. E. and Garner, H. V. 1968. Broadbalk: Historical Introduction. Rothamsted Experimental Station Report. 2, pp. 12-25.
Warren, R. G. and Johnston, A. E. 1967. Hoosfield Continuous Barley. Rothamsted Experimental Station Report.
Warren, R. G., Johnston, A. E. and Cooke, G. W. 1965. Changes in the Park Grass experiment. Rothamsted Experimental Station Report.
Warren, R. G. and Johnston, A. E. 1965. Notes on the use of soil analysis for estimating available P in Rothamsted soils. Technical Bulletin Ministry of Agriculture Fisheries and Food. 13, pp. 30-37.
Warren, R. G. and Johnston, A. E. 1964. The Park Grass Experiment. Rothamsted Experimental Station Report.
Warren, R. G. and Johnston, A. E. 1962. Barnfield.
Warren, R. G., Johnston, A. E. and Arnold, P. W. 1962. The accumulation and loss of soil potassium in long-term experiments, Rothamsted and Woburn. Proceedings of the Fertiliser Society. 72, pp. 5-24.
Warren, R. G. and Johnston, A. E. 1959. The Exhaustion Land site. Rothamsted Experimental Station Report.

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