bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Influence of Ammonium Nitrate on the Growth and Yield of Crested Wheatgrass on the Oregon High Desert1
Authors: Sneva Forrest A. , Hyder Donald N. , Cooper C. S. 
Published: July 2010

SynopsisSpring yields of crested wheatgrass were more than doubled by application of 30 pounds per acre of N and were directly related to April and May temperatures but inversely related to the amount of fall and winter precipitation over a 4‐year period. Annual yields were directly related to fertility rate, and to the amount of precipitation received in the preceding November 1 to June 1 period. Counting residual response, the 20 pounds per acre fertility rate returned 25 pounds of herbage per pound of N applied.
Chromosome Numbers, Fertility and Rhizome Expression of Hybrids Between Grain Sorghum and Johnsongrass1
Authors: Hadley Henry H. 
Published: July 2010

SynopsisHybrids between either male‐fertile or genetic male‐sterile grain sorghum and Johnsongrass included highly sterile 30‐chromosome and relatively fertile 40‐chromosome types. Hybrids between cytoplasmic male‐sterile gram sorghum and Johnsongrass included highly sterile 30‐chromosome and male‐sterile 40‐chromosome types. Rhizomes of the 30‐chromosome types were vigorous; those of the 40‐chromosome types were generally much weaker.
Nitrate Accumulation in Some Iowa Crop Plants1
Authors: Hanway J. J. , Englehorn A. J. 
Published: July 2010

SynopsisNitrate accumulation occurred in stalks or stems of corn, sorghum, and soybean plants. Legumes in the rotation or applications of manure or nitrogen fertilizer increased the nitrate content of the plants. The amount of nitrate in plants depended upon the stage of maturity, the degree of drouth injury, and the availability of nitrogen in the soil. Nitrate content was reduced but not destroyed by ensiling corn plants.
Chemical Composition, Nutrient Absorption, and Stalk Rot Incidence of Corn as Affected by Chloride in Potassium Fertilizer1
Authors: Younts S. E. , Musgrave R. B. 
Published: July 2010

SynopsisHigh rates of chloride had little effect on the percentage of other elements in corn leaf tissue in field experiments, whereas total absorption of phosphorus, nitrogen, and magnesium was affected in pot experiments. Stalk rot incidence was decreased with increased potassium chloride applications but not with increased potassium sulfate and potassium metaphosphate applications.
Air Pollution With Relation to Agronomic Crops: VII. Fluoride Uptake from Soils1
Authors: Hansen E. Don , Wiebe H. H. , Thorne Wynne 
Published: July 2010

SynopsisFluoride uptake by turnips and alfalfa from four soils was increased by addition of sodium fluoride and sodium fluorosilicate. Uptake was less from soils containing higher levels of clay, lime, and organic matter. Yields were generally reduced when fluoride absorbed from the soils reached levels exceeding 60 ppm in the shoots.Under field conditions, fluoride contamination to plants apparently occurs directly from the air rather than indirectly by way of the soil.
Vector Representation of Biologic Fields of Force1
Authors: Grafius J. E. , Kiesling R. L. 
Published: July 2010

SynopsisA vector method was developed to describe planes of force due to the interaction of a set of genotypes and the environment. Vector analysis was used to estimate the effect of a disease and of night temperature on sets of genotypes. The effect of mildew on barley was described in terms of an angle θ from a given axis which represented the severity of the epiphytotic, and in terms of the degree of determination by the forces in the so‐called mildew plane.
The Relationship of Furrow Depth to Moisture Content of Soil and to Seedling Establishment on a Range Soil1
Authors: McGinnies William J. 
Published: July 2010

SynopsisThe use of furrows 2 to 4 inches deep significantly increased soil moisture available for seed germination on a range soil by reducing the rate of moisture loss. Seedling establishment was improved by using a 4‐inch deep furrow.
Variety ✕ Environment Interactions in Cotton Variety Tests and Their Implications on Testing Methods1
Authors: Miller P. A. , Williams J. C. , Robinson H. F. 
Published: July 2010

SynopsisA substantial variety ✕ location ✕ year second‐order interaction was observed for lint yield. Variety ✕ year and variety ✕ location interactions, however, were small and nonsignificant. Thus it does not appear necessary to divide the North Carolina cotton area into subareas for testing purposes.
A Correlation and Path‐Coefficient Analysis of Components of Crested Wheatgrass Seed Production1
Authors: Dewey Douglas R. , Lu K. H. 
Published: July 2010

SynopsisFertility and plant size were the most important components of seed yield. Inasmuch as fertility and plant size were negatively correlated, r = −.665, a compromise must be reached in selection for these two characters if maximum seed yields are to be obtained. The method of “path coefficients” proved useful in analyzing correlation coefficients in this system of interrelated variables.
Heterosis in Barley1
Authors: Grafius J. E. 
Published: July 2010

SynopsisEvidence was presented that genes for yield per se do not exist in barley. Hence yield is an artifact. If there are no genes per se for yield, there can be no dominance effects due to yield genes, or for that matter no over‐dominance of yield genes or heritability of yield. F1 vigor was shown to be due to epistasis. A large share of the F1 vigor in this experiment was shown to be fixable in a true breeding form.
The Randomness of Pollination in a Polycross Nursery of Smooth Bromegrass, Bromus inermis Leyss1
Authors: Ives Joseph D. , Thomas H. L. 
Published: July 2010

SynopsisTests for randomness of pollination for 13 characters showed only 1 case out of the 13 with significant differences due to replication (i.e. location) in the polycross or parental field.
The Inheritance of Resistance in Barley to the Yellow‐Dwarf Virus1
Authors: Rasmusson D. C. , Schaller C. W. 
Published: July 2010

SynopsisYellow dwarf resistance was controlled by 1 gene in each of 4 barley varieties. Evidence from resistant ✕ resistant crosses indicated that these varieties carried the same gene for resistance. This gene conditioned a level of resistance adequate to assure fair yields under the most severe yellow dwarf conditions. No associations were found between the gene for resistance to yellow dwarf and genes located on linkage groups I and II.
Inheritance of Plant Height and Capsule Length in Sesame, Sesamum Indicum L.
Authors: Culp Thomas W. 
Published: July 2010

SynopsisInheritance of plant height was found to be controlled by 3 to 10 factors, most of which produced complete dominance of tall plants. Heritability of this character was estimated to be in the range of 40 to 50%. Inheritance of capsule length was found to be controlled by 2 to 5 factors. Dominance of genes for both short and long capsules was indicated. Heritability of this character was estimated to be in the range of 50 to 70%. Correlations between characters were highly significant, but of low magnitude.
Predicting Disease Resistance in Synthetic Varieties of Alfalfa from Clonal Cross Data1
Authors: Pearson L. C. , Elling L. J. 
Published: July 2010

SynopsisFor resistance to each of two diseases, bacterial wilt and common leafspot, synthetic variety performance essentially agreed with the average performance of all the crosses among the clones of which each synthetic was composed. There was no evidence of specific combining ability among the clonal crosses for either of these characters.
Influence of Environment on the Vegetative Growth of Plants Watered at Various Soil Moisture Suctions1
Authors: Letey J. , Blank G. B. 
Published: July 2010

SynopsisAt high suctions there was greater reduction in vegetative plant growth when the environment caused high evapotranspiration than when the evapotranspiration was low. Transpiration diminished as soil moisture suction increased, regardless of environment, but, under conditions of high evapotranspiration, the reduction in transpiration was relatively greater. Regardless of environment, less water was used per unit dry weight produced when watering was delayed until higher suctions.
Leaf Area Determination in Grain Sorghum1
Authors: Stickler F. C. , Wearden S. , Pauli A. W. 
Published: July 2010

SynopsisMaximum length × maximum width × 0.747 was found to be an accurate and reliable method of estimating leaf area in 6 grain sorghum varieties. Using the component of variance technique, it was shown that most of the variability in area from leaf to leaf on the sorghum plants within a set of data was due to position on the plant.
Effect of Certain Fertility and Management Treatments on the Growth and Early Development of Tillers of Two Varieties of Smooth Bromegrass1
Authors: Hertz L. B. 
Published: July 2010

SynopsisSeedlings of two varieties of Bromus inermis Leyss., Lyon and Canadian certified, produced more tillers when kept free of weeds than when weeds were clipped or where a companion crop was used. The production of tillers by Canadian certified (northern adapted) was greater than by Lyon (southern adapted) when free of competition. The addition of fertilizer did not significantly increase the development of tillers.
Relative Efficiency of Plot Sizes and Numbers of Replications as Indicated by Yields of Orchardgrass Seed in a Uniformity Test1
Authors: Rampton H. H. , Petersen Roger G. 
Published: July 2010

SynopsisIncreasing replications or increasing plot size permitted detection of smaller differences in yield of orchardgrass seed. Accuracy of yield estimates changed most rapidly with change in replications. Hence, on a given area, most accurate yield estimates would result with plots of minimum size and increased replications. Plot cost:land cost relationships showed that as land cost increased, optimum plot size decreased. Optimum plot size for close‐drills was about half that for 3‐foot rows.
Influence of Soil Oxygen on Growth and Mineral Concentration of Barley1
Authors: Letey J. , Stolzy L. H. , Valoras N. , Szuszkiewicz T. E. 
Published: July 2010

SynopsisTechniques for varying soil oxygen in studies involving grasses are described. Vegetative growth of barley was found to be rather insensitive to low soil oxygen. Oxygen diffusion rates of approximately 15 × 10−8 gm. cm.−2 min.−1 is limiting for barley root growth whereas the optimum diffusion rate for shoot growth is less than 40 × 10−8. Low oxygen decreased the concentration of K and P in the shoot, but Na and Ca+Mg were not greatly influenced by the oxygen treatment.
Effect of Soil Temperature and Nitrogen Fertilization on the Growth of Soft Chess (Bromus mollis) at Two Elevations
Authors: Jones M. B. , McKell C. M. , Winans S. S. 
Published: July 2010

SynopsisApplied nitrogen increased the growth rate of the grass very little when the average soil temperature was below 45° F. Grass fertilized with nitrogen showed the greatest increase in growth compared with unfertilized grass when the average soil temperature was between 47° and 55°. When the temperature went above 55° the difference between unfertilized and fertilized grass decreased.
Leachable Nitrogen from Soils Incubated with Turfgrass Fertilizers1
Authors: Bredakis E. J. , Steckel J. E. 
Published: July 2010

SynopsisLeachable nitrogen was greatest in the first 3‐week period and varied as follows: (NH4)2S04 = Urea > castor pomace > Milorganite > Uramite = Nitroform. In the 3‐ to 12‐week period leachable nitrogen varied as: Uramite = Nitroform > castor pomace = Milorganite. Decreased soil acidity increased the leachable nitrogen from all materials in the first 3 weeks.
Estimates of Optimum Plot Size and Shape and Replicate Number for Forage Yield of Alfalfa‐Bromegrass Mixtures1
Authors: Torrie J. H. , Schmidt D. R. , Tenpas G. H. 
Published: July 2010

SynopsisIncreasing plot length was more efficient than increasing plot width to reduce variation among plots for forage yield of alfalfa‐bromegrass mixtures. Estimates of optimum plot size and replicate number to detect differences among treatments were similar, using the coefficient of variability and Smith's b. Greater efficiency and less variation in the relative costs of plots of different sizes were observed for the lattice as compared with the randomized complete block designs.
Effect of Aluminum on Copper Sorption by Wheat1
Authors: Hiatt A. J. , Amos D. F. , Massey H. F. 
Published: July 2010

SynopsisThe uptake of copper by excised wheat roots was inhibited by the presence of low concentrations of aluminum in the substrate. No evidence was obtained to indicate that copper and aluminum were competing for a common ion carrier involved in active accumulation. The inhibition tended to be overcome by higher levels of copper concentrations, suggesting that aluminum and copper were competing for common binding sites at or near the root surface.
Irrigation Water Management and Nitrogen Fertilization of Grain Sorghums1
Authors: Musick J. T. , Grimes D. W. , Herron G. M. 
Published: July 2010

SynopsisGrain yields were curvilinearly related to the number of irrigations, depletion of soil moisture, and increments of applied N. Evapotranspiration was related to number of irrigations and to available soil moisture. Plant growth response to applied N increased evapotranspiration slightly. Irrigation and applied N both increased the efficiency of water use. Maximum efficiency occurred at a yield level below maximum production.
Effects of Mineral Nutrition on High Temperature Induced Growth Retardation of Kentucky Bluegrass1
Authors: Pellett Harold M. , Roberts Eliot C. 
Published: July 2010

SynopsisTurf grown on low N was more resistant to high temperatures than that on high N. Neither P nor K affected this resistance. High levels of N and P gave less‐resistant plants than high N and low P. The reverse was true with N and K.
Row Spacing, Plant Populations and Moisture Supply as Factors in Dryland Grain Sorghum Production1
Authors: Bond J. J. , Army T. J. , Lehman O. R. 
Published: July 2010

SynopsisField experiments and long term weather data indicate that in the Southern Great Plains plant populations of about 18,000 plants per acre in 40‐inch rows will in most years result in the best grain yields. Forage production was higher with reduced row width and increased seeding rates. Results are explained on the basis of water availability and use during the growing season.
Principles of Nutrient Uptake From Fertilizer Bands. VI. Germination and Emergence of Corn as Affected by Ammonia and Ammonium Phosphate1
Authors: Allred S. E. , Ohlrogge A. J. 
Published: July 2010

SynopsisFree ammonia associated with diammonium phosphate fertilizer was toxic to germinating corn. Ammonia at partial vapor pressures as low as 0.125 mm. Hg was toxic to corn when it was exposed to this environment for 2 days during the initial stages of germination.
Pans in the Southern Great Plains Soils. I. Why Root‐Restricting Pans Occur1
Authors: Taylor H. M. , Mathers A. C. , Lotspeich F. B. 
Published: July 2010

SynopsisSeventeen root‐restricting pans of the Southern Great Plains were investigated. The concept that soil pans are either genetic in origin or that they develop as a result of man's manipulation of the soil can explain less than half of the cases. The theory is developed that the root‐restricting features of these 17 pans are caused by excessive soil strength that occurs largely as a result of soil drying.
Studies with Sudangrass. I. Effect of Growth Stage and Level of Nitrogen Fertilizer Upon Yield of Dry Matter; Estimated Digestibility of Energy, Dry Matter and Protein; Amino Acid Composition; and Prussic Acid Potential1
Authors: Jung G. A. , Lilly B. , Shih S. C. , Reid R. L. 
Published: July 2010

SynopsisYields increased and digestibility decreased with advance in maturity. Nitrogen fertilization influenced yields markedly but had only a minor effect on digestibility of dry matter. Amino acid levels were altered by both cutting management and nitrogen fertilization. Prussic acid levels for all treatments were low and considered as safe for livestock.
An Evaluation of Nitrogen Fertilization in Legume‐Grass and All‐Grass Pasture1
Authors: Wedin W. F. , Donker J. D. , Marten G. C. 
Published: July 2010

SynopsisA simple legume‐grass mixture was more productive than a grass + N mixture in 1958 but less productive in 1959, following legume depletion due to winter‐killing. A low rate of nitrogen applied to depleted legume‐grass swards was economically superior to high rates on either legume‐depleted or all‐grass pastures, but especially the latter. Results over the 5‐year period suggest the desirability of seeding simple legume‐grass mixtures with limited nitrogen amendments after legume depletion rather than seeding of either complex or all‐grass mixtures.
The Growth and Yield of Corn. II. Daily Growth of Corn Kernels1
Authors: Duncan W. G. , Hatfield A. L. , Ragland J. L. 
Published: July 2010

SynopsisUnder the conditions of this experiment the stalk was an important storage organ for sugar which, under some conditions, can be translocated to maintain dry weight growth of the kernels for extended periods in the absence of photosynthesis. It seems probable that sugar storage in the stalk provides most of the reservoir of readily mobile sucrose required to maintain relatively uniform kernel growth in spite of wide diurnal and day‐to‐day variation in photosynthesis.
An Exponential Model for Predicting Optimum Plant Density and Maximum Corn Yield1
Authors: Carmer S. G. , Jackobs J. A. 
Published: July 2010

SynopsisThe relationship between yield of corn, Y, and plant density, N, per unit area may be depicted as Y = NAKN. Methods of estimating the parameters A and K and optimum density, Nopt, and maximum yield, Ymax, are presented. Data from a yield trial of 8 single cross hybrids at 4 densities are used to illustrate the usefulness of the model.
Effect of Temperature and Cutting on the Growth of Creeping Bentgrass (Agrostis palustris Huds.) Roots1
Authors: Beard James B. , Daniel William H. 
Published: July 2010

SynopsisThe rate of growth of individual roots and total root production of creeping bentgrass was significantly reduced at 90° F. Cessation of growth of individual roots occurred more rapidly as temperature was increased from 60° to 90° F., but the rate of root growth on a per day basis was similar in the 60 to 80° F. range.
Effect of Planting Time and Photoperiod on Tephrosia vogelii
Authors: Irvine J. E. , Freyre R. H. 
Published: July 2010

AbstractTwenty‐six consecutive plantings of Tephrosia vogelii were made at 2‐week intervals at Mayaguez, Puerto Rico, to determine the effect of planting time on growth rate, flowering, and rotenoid content. The replicated plantings showed that maximum growth occurred in the spring, irrespective of planting time. Flowering occurred as a photoperiodic response to a 13‐hour day or to an interrupted night. Leaf‐rotenoid content as measured by the red‐color test was lowest in spring and highest in fall in plants of the same age.
Soil Fertilization and Nitrate Accumulation in Vegetables1
Authors: Brown J. R. , Smith G. E. 
Published: July 2010

AbstractFive different rates of nitrogen were applied to plots upon which were grown several different varieties of vegetables. Nitrogen fertilization caused significant increases in nitrate content in red radishes, kale, mustard, and turnip roots and tops. The maximum accumulation of nitrates appeared to vary with species, but differences in harvest dates between species precluded valid statistical tests of the differential accumulations. No significant differences in nitrate accumulation were found between varieties of the same species. Early maturing vegetables tended to accumulate more nitrate than late maturing varieties at a given rate of fertilization. Differences in nitrate content were observed at different sampling dates. The absence of phosphorus, potassium, or lime, or the presence of trace elements in the fertilizer treatment had no significant influence on nitrate accumulation.
Longevity and Dormancy in Seeds of Several Cool‐Season Grasses and Legumes Buried in Soil1
Authors: Rampton H. H. , Ching Te May 
Published: July 2010

AbstractNine kinds of crop seeds were buried in the field at 1‐, 2‐, 3‐, 5‐, and 7‐inch depths in Saran mesh bags to determine seed longevity and dormancy. Generally, persistence and viability were lowest at the 1‐inch depth and increased with depth, with differential longevity among species. Seeds of perennial ryegrass declined in viability most rapidly; orchardgrass and chewings fescue lost their viability after three winters; Highland bentgrass and Oregon annual ryegrass retained considerable viability; and red clover was highest in viability.
A Physiological Effect of Nitrogen on Phosphorus Absorption by Corn1
Authors: Leonce F. S. , Miller M. H. 
Published: July 2010

AbstractA series of soil and solution experiments were conducted to study the mechanism responsible for the increased P absorption which occurs when N is added to a P fertilizer band.The addition of (NH4)2SO4 or NH4Cl to a pellet P‐32 labelled, concentrated superphosphate placed 0.5 inch to the side of a corn root greatly increased the labelled P content of the plant tops. The addition of KNO3 reduced the P content of the tops when compared to concentrated superphosphate only. When the pellets consisted of phosphate only or phosphate plus KNO3, labelled P accumulated to high levels in the root as revealed by autoradiographs. No such accumulation occurred in the presence of NH4+ ions.The addition of NH4NO3 to a nutrient solution increased the transfer of P through a 1‐inch segment of a corn root exposed to the solution, but did not influence the accumulation in the root.It was concluded that the NH4+ ion has a specific influence on the transfer of P across the root symplast to the xylem.
Salt Tolerance of N. Co. Varieties of Sugar Cane. I. Sprouting, Growth, and Yield1
Authors: Bernstein Leon , Francois L. E. , Clark R. A. 
Published: July 2010

AbstractThe salt tolerance of N. Co. 293 and N. Co. 310 was determined in large greenhouse soil cultures with four levels of added NaCl and CaCl2 and in artificially salinized field plots. In the latter, sulfate salinity and high proportions of magnesium salts were also studied. ‘N. Co. 293’ was more salt‐tolerant than ‘N. Co. 310’ at moderate and high salinities, but both varieties had similar salt tolerance in the greenhouse at a low salinity. Yields decreased by 10% at 3 mmho/cm (ECe) and by 25% at about 5 mmho/cm. The ratoon crop in the field plots was only half as salt tolerant as the seed crop, and differences in salt tolerance between the varieties diminished during the second year. The greater sensitivity of the second year's growth is tentatively attributed to the combined effect of low winter temperature and salinity.