cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14307017
title: Attenuation of low-temperature stress in rice seedlings

description: ABSTRACT Rice is a cold-sensitive crop, and its exposure to low-temperature stress, during germination and early seedling growth, can negatively affect the initial stand establishment. Substances that act as growth regulators can be used to mitigate this initial stress. Thus, the influence of gibberellic acid, thiamethoxam and a phytohormone was investigated at the growth variables and antioxidant enzyme activity of the 'Irga 424' and 'Puita Inta CL' rice cultivars, at low-temperature (17 ºC). The products act on the germination percentage of 'Puita Inta CL', but vigor is only influenced by giberellic acid. Giberellic acid influences shoot length, irrespective of cultivar, while thiamethoxam and the phytohormone only affect length in 'Puita Inta CL'. The antioxidant activity depends on the cultivar and organ tested (shoot or root). These products mitigate the effects of cold, thereby preventing the formation of reactive-oxygen species and lipid peroxidation, and positively influence the superoxide dismutase enzyme activity.
DOI: 10.6084/m9.figshare.14306996
title: Mathematical models of anaerobic digestion for the treatment of swine effluents

description: ABSTRACT Pig breeding results in the production of large amounts of waste, which can cause serious environmental problems, when handled incorrectly. This study aimed at testing mathematical models to estimate the parameters of anaerobic biodigestion in biodigesters as a function of the composition of swine effluents with and without separation of the solid fraction and hydraulic retention times (HRT). Semi-continuous biodigesters fed with swine effluents with and without separation of the solid fraction and managed for 15, 22, 29 and 36 days of hydraulic retention were used. The potential of biogas and methane production, as well as the reduction of total solids, volatile solids and chemical oxygen demand, were assessed as a function of the effluents composition. HRT was the variable that most influenced the variation of the models, followed by the contents of total and volatile solids. Uni and multivariate models presented high confidence indices, being classified as “great” at predicting the potentials of biogas and methane production and “good” at predicting the reductions of total solids, volatile solids and chemical oxygen demand. The models obtained in this study can be used to reliably predict the parameters of the anaerobic biodigestion process of swine effluents in semi-continuous tubular biodigesters.
DOI: 10.6084/m9.figshare.14306994
title: Alternatives in bean fertilization to reduce the application of N-urea

description: ABSTRACTAs a result of the increasing use of chemical nitrogen fertilizers and their economic and environmental impacts, it is necessary to search for alternative methods to improve soil fertility, such as biological nitrogen fixation and/or alternative supplements of this nutrient. This study aimed at evaluating the effects of inoculation and application of seaweed extract, molybdenum and rock powder, as an alternative to the application of urea, in beans. A randomized blocks design, with three replications, was used. Two common bean cultivars (Pérola and FEPAGRO 26), as well as the following cultivation methods, were used: i) conventional; ii) inoculation with a mixture of three inoculants recommended for bean; iii) inoculation + complementation via seeds, with extracts of the Ascophyllum nodosum seaweed and mineral fertilizer containing rock powder and molybdenum; iv) inoculation + complementation via leaf, using products with extracts of the Ascophyllum nodosumseaweed and mineral fertilizer containing rock powder and molybdenum. The inoculation alone is not enough to reach grain yield levels similar to those reached using the conventional method. The cultivation method with inoculation + complementation via seeds maintains grain yield with the lowest cost, in relation to the conventional method.
DOI: 10.6084/m9.figshare.14306993
title: Water and salt stress in soybean seeds classified in different sizes

description: ABSTRACT The importance of seed size has been reported for many species, since it may affect seed germination and seedling vigor, especially under stress conditions. This study aimed at evaluating the effect of seed size on the germination and initial growth of soybean seedlings (M9144RR and M8527RR cultivars), under water and salt stress conditions. Water stress was induced by mannitol and salt stress by sodium chloride. The seeds were submitted to the germination test, first germination count and seedling growth to assess the effects of the treatments. A completely randomized design with four replications was used. The germination and vigor of soybean seeds decreased with the reduction of osmotic potential. There was no effect of seed size on germination and seedlings length. However, the seeds with higher size resulted in seedlings with greater dry mass, even when subjected to water and salt stress conditions.
DOI: 10.6084/m9.figshare.14306991
title: Agronomic characteristics and yield of organic maize straw intercropped with perennial green manures

description: ABSTRACT Maize intercropped with perennial green manure is an option to promote soil coverage, control weeds and recycle soil nutrients, in an organic system. This study aimed at evaluating the agronomic characteristics and yield of grains and organic maize straw intercropped with perennial green manures sown at different maize growth stages. A 3 x 2 + 1 factorial design was used, with three perennial species of green manure - calopogonium (Calopogonium mucunoides Desv.), tropical kudzu [Pueraria phaseoloides (Roxb.) Benth] and perennial soy [Neonotonia wightii (Wight & Arn) Lackey] - and two green manure sowing times - at the maize V4 (four expanded leaves) and VT (bolting) stages - plus a control treatment (maize monoculture). A randomized blocks design, with four replications, was used. Soil coverage, production of green manures dry matter and weeds, and maize growth and production variables were evaluated. The sowing of green manures at the V4 stage had a higher percentage of soil coverage, in relation to the VT stage. Calopogonium, when compared to the other green manure species, had the highest percentage of soil coverage (35.63 %) and dry matter (1.0 Mg ha-1). Perennial green manures grown intercropped with maize did not affect growth, grain yield and maize straw. However, they were not effective in suppressing weeds.
DOI: 10.6084/m9.figshare.14306988
title: Total alcoholic acidity and pH tests as quality parameters in stored soybean grains

description: ABSTRACT Despite the technology available to agriculture, qualitative and quantitative losses occurring during post-harvest are still not controlled, and stored grains may undergo changes in their composition, due to storage conditions. This study aimed at determining the sensitivity of the alcoholic acidity and pH tests in soybean (GB 874RR cultivar) grains with different quality standards obtained during storage. A completely randomized design, in a 3 x 6 x 5 (3 storage conditions x 6 storage times x 5 methods) factorial scheme, was used. A correlation was observed among pH, total acidity content (r = 0.888) and grain quality parameters. Deterioration was identified based on the total acidity content, showing a high correlation with fungal incidence (r = 0.864), ether extract (r = -0.781) and electrical conductivity (r = 0.923). The use of phenolphthalein as indicator is more sensitive than pH 8.8. Among the pH determination methods, AOAC was the most suitable for assessing the quality loss during storage.
DOI: 10.6084/m9.figshare.14306985
title: Potassium availability to flooded rice in lowland soils

description: ABSTRACT Non-exchangeable potassium (K) forms are not estimated by usual methods of soil K availability, like Mehlich-1, but they can contribute to K nutrition of flooded rice. This study aimed at evaluating K forms in lowland soils by different chemical methods and associate them to K absorption by flooded rice. Fourteen lowland soils cultivated with flooded rice (IRGA 417 cultivar) were sampled and used in a greenhouse experiment. The K forms in the soil samples were extracted before and after rice cultivation by using calcium chlorite, Mehlich-1, sodium tetra phenyl borate (NaTFB) and fluorite acid. The K uptake was measured in rice shoots. There was a wide variation in K forms among the lowland soils. The variation in the amount of K extracted by using the Mehlich-1 method does not explain the K absorption by irrigated rice plants in every soil. The NaTFB method was more sensitive to evaluate K availability in lowland soils cultivated with flooded rice plants.
DOI: 10.6084/m9.figshare.14306984
title: Volumetric contraction and drying kinetics of Musa sapientum slices

description: ABSTRACT Drying is a method employed in food preservation, which influences the preservation time, quality and durability of these products. This study aimed to characterize the drying kinetics and evaluate the shrinkage of Musa sapientum slices, under temperatures of 40-60 ºC. The mathematical models used to analyze drying were diffusion approximation, two terms, Midilli & Kucuk and Thompson, while the ones used to evaluate shrinkage were Lozano, McMinn & Magee, Rovedo, Suarez & Viollaz and Ratti. The model that best fitted the experimental drying data was Midilli & Kucuk, for presenting the best coefficient of determination (R2) and the lowest average relative error (P) and estimate standard deviation (SE). For shrinkage, the best model was Ratti, due to its higher R2 and lower P and SE. The volume reduction (VR) presented an inverse relation with temperature. For temperatures of 40 ºC, 50 ºC and 60 ºC, the VR estimates with pachymeter were respectively 21.65 %, 19.46 % and 17.74 %, while the estimates with image were 27.74 %, 24.08 % and 22.50 %.
DOI: 10.6084/m9.figshare.14306981
title: Isolation and selection of plant growth-promoting bacteria associated with sugarcane

description: ABSTRACT Microorganisms play a vital role in maintaining soil fertility and plant health. They can act as biofertilizers and increase the resistance to biotic and abiotic stress. This study aimed at isolating and characterizing plant growth-promoting bacteria associated with sugarcane, as well as assessing their ability to promote plant growth. Endophytic bacteria from leaf, stem, root and rhizosphere were isolated from the RB 867515 commercial sugarcane variety and screened for indole acetic acid (IAA) production, ability to solubilize phosphate, fix nitrogen and produce hydrogen cyanide (HCN), ammonia and the enzymes pectinase, cellulase and chitinase. A total of 136 bacteria were isolated, with 83 of them presenting some plant growth mechanism: 47 % phosphate solubilizers, 26 % nitrogen fixers and 57 % producing IAA, 0.7 % HCN and chitinase, 45 % ammonia, 30 % cellulose and 8 % pectinase. The seven best isolates were tested for their ability to promote plant growth in maize. The isolates tested for plant growth promotion belong to the Enterobacteriaceae family and the Klebsiella, Enterobacter and Pantoea genera. Five isolates promoted plant growth in greenhouse experiments, showing potential as biofertilizers.
DOI: 10.6084/m9.figshare.14306979
title: Application of biodegradable films produced from irradiated whey protein concentrate

description: ABSTRACT Biodegradable films from whey proteins have a great potential for application on packaging, due to their excellent mechanical and optical properties. However, some processes, such as the use of gamma radiation, can affect the physical, mechanical and color properties of films produced from these proteins. This study aimed to produce biodegradable films from irradiated whey protein concentrate (50 kGy) and evaluate their efficiency for packaging apple. The use of films prepared with irradiated whey proteins was not a good barrier to moisture loss, when subjected to a temperature of 25 ºC and relative humidity of 55 %, but it is a great alternative for color preservation, slowing the browning of apples after cutting.
DOI: 10.6084/m9.figshare.14306976
title: Sugarcane leaf area estimate obtained from the corrected Normalized Difference Vegetation Index (NDVI)

description: ABSTRACT Large farmland areas and the knowledge on the interaction between solar radiation and vegetation canopies have increased the use of data from orbital remote sensors in sugarcane monitoring. However, the constituents of the atmosphere affect the reflectance values obtained by imaging sensors. This study aimed at improving a sugarcane Leaf Area Index (LAI) estimation model, concerning the Normalized Difference Vegetation Index (NDVI) subjected to atmospheric correction. The model generated by the NDVI with atmospheric correction showed the best results (R2 = 0.84; d = 0.95; MAE = 0.44; RMSE = 0.55), in relation to the other models compared. LAI estimation with this model, during the sugarcane plant cycle, reached a maximum of 4.8 at the vegetative growth phase and 2.3 at the end of the maturation phase. Thus, the use of atmospheric correction to estimate the sugarcane LAI is recommended, since this procedure increases the correlations between the LAI estimated by image and by plant parameters.
DOI: 10.6084/m9.figshare.14306975
title: Biometrics and physicochemical components of pomegranate stored under refrigeration

description: ABSTRACT The commercial cultivation of pomegranate plants has been growing throughout Brazil and has attracted the interest of northeastern fruit producers. However, for the establishment of pomegranate in the in natura fruit market, it is necessary to find out the refrigeration temperature most suitable for commercializing the product in distant markets. This study aimed to characterize the quality of ‘Molar’ pomegranate, during the storage of in natura fruits under different refrigeration temperatures (6 ºC, 10 ºC and 12 ºC). A completely split-plot randomized design, with four replications and four fruits per plot, was used. It was concluded that ‘Molar’ pomegranates stored at 12 ºC, for 36 days, followed by two days at 24 ºC and 43 ± 5 % RH, remain satisfactory for in natura commercialization, without affecting their biometric quality attributes and with small losses in their physicochemical properties. The temperatures of 6 ºC and 10 ºC may also be used for the refrigerated storage of the ‘Molar’ pomegranate, but with a smaller volume of juice per fruit.
DOI: 10.6084/m9.figshare.14306973
title: Growth suppression of sandspur grass by cover crops1

description: ABSTRACTSandspur grass has hindered the integrated weed management in the Brazilian crop systems. This study aimed at evaluating the efficiency of biomass levels of different cover crops on the soil surface to control the sandspur grass. A complete randomized blocks design with four replications, in a 6 x 5 + 1 factorial arrangement, was used. The first factor consisted of six cover crops (Pennisetum glaucum-ADR 7010 and ADR 300 cultivars, Crotalaria ochroleuca, Urochloa ruziziensis, Fagopyrum tataricum and Crambe abyssinica) and the second one consisted of five biomass levels of each species (2 t ha-1, 4 t ha-1, 8 t ha-1, 12 t ha-1 and 16 t ha-1), plus a control treatment without soil cover. The variables analyzed were the total number of emerged plants, germination speed index, leaf area, root volume and shoot and root dry biomass. U. ruziziensis excelled in the suppression of C. echinatus growth by reducing the number of emerged plants, emergence speed index, shoot and root dry biomass, root volume and leaf area.
DOI: 10.6084/m9.figshare.14306970
title: Water erosion of dystrophic Red Latosols (Oxisols)

description: ABSTRACT In their natural state, Latosols (Oxisols) present great stability and resistance to erosion, being the most abundant and used soils for farming and cattle raising activities in southern Minas Gerais State, Brazil. However, along the last one hundred years, they have been submitted to intensive cultivation and managements which favor water erosion. This study aimed to estimate the water erosion rates of dystrophic Red Latosols from the Revised Universal Soil Loss Equation, compared with the soil loss tolerance limits, and assess the impact on water erosion of the managements more common in the region, by alternative conservation management simulation. Soil loss tolerance limits ranged from 8.94 Mg ha-1 year-1 to 9.99 Mg ha-1 year-1, with the study area presenting a susceptibility of soil loss of 23.86 Mg year-1, with an average rate of 8.40 Mg ha-1 year-1, corresponding to 34.80 % of the area with values above the soil loss tolerance limit. The biggest annual losses occur in areas with use and management of eucalyptus grown downhill (30.67 Mg ha-1 year-1) and pasture under continuous occupancy (11.10 Mg ha-1 year-1). However, when the average loss per type of use is considered, the areas more susceptible to water erosion are those with potato and eucalyptus crops, grown downhill, and those in bare soil. Nevertheless, in the simulated conservation management scenario, the average losses would be drastically reduced (8.40 Mg ha-1 year-1 to 2.84 Mg ha-1 year-1) and only 4.00 % of the area with soil loss would remain above the tolerance limits.
DOI: 10.6084/m9.figshare.14306969
title: Mycorrhizal fungi increase coffee plants competitiveness against Bidens pilosa interference

description: ABSTRACT Mycorrhizae provide several benefits to coffee plants. This study evaluated whether these benefits influence the damage caused by the Bidens pilosa competition with coffee seedlings. A randomized blocks design was used, with treatments established in a 2 x 3 factorial scheme (presence and absence of B. pilosa interference in non-inoculated control or plants inoculated with either Claroideoglomus etunicatum or Dentiscutata heterogama). Coffee seedlings were inoculated with fungi spores and developed for 120 days. Then, they were subjected to the interference of B. pilosa for more 120 days, when data were collected for growth traits, mycorrhizal colonization, dry matter and foliar nutrient concentrations in coffee plants. Dry matter and nutrient contents in B. pilosa plants were also evaluated. Inoculation provided better growth and nutrition of coffee plants. The competition with B. pilosa reduced mycorrhizal colonization, height, leaf area, leaf and stem dry mass, root dry weight, number of reproductive branches and levels of P and Fe in the coffee plants. However, the harmful effect of the interference was lower in inoculated coffee plants. The dry mass of B. pilosa decreased under the interference of inoculated coffee plants. The inoculation of C. etunicatum and D. heterogama in Arabica coffee seedlings increases the competitiveness of the crop against B. pilosa interference.
DOI: 10.6084/m9.figshare.14306966
title: Gypsum and lime increase soybean and maize yield and decrease drought stress

description: ABSTRACT During the maize and soybean cultivation process, water deficit occurs frequently and can reduce grain yield. Gypsum can be used to mitigate yield losses. This study aimed to evaluate the influence of gypsum application, with and without lime, on soil chemical properties and maize and soybean yield, in a no-till system. The experimental design was completely randomized, with six gypsum doses (0 t ha-1, 0.5 t ha-1, 1 t ha-1, 2 t ha-1, 4 t ha-1 and 8 t ha-1), lime application and four replications, for maize. For soybean, a 6 x 2 factorial scheme, with six gypsum doses (0 t ha-1, 0.5 t ha-1, 1 t ha-1, 2 t ha-1, 4 t ha-1 and 8 t ha-1), with and without lime application, and four replications was used. Soil chemical attributes and maize and soybean grain yield were evaluated. Gypsum increases the Ca2+ levels, redistributes Mg2+ to the 10-20 cm and 20-40 cm depth layers and decreases the Al3+ contents in the 20-40 cm layer. Liming increases pH in the 0-10 cm depth layer and pH is not affected by the gypsum application. Gypsum increases maize and soybean grain yield, with response up to the 2 t ha-1 dose, with increments of 9.3 %, for maize, and 11.4 % and 11.3 %, respectively with and without lime, for soybean.
DOI: 10.6084/m9.figshare.14306894
title: AO_Data.xlsx

description: The dataset available here, is the final data set used for analysis after removing incomplete responses. Responses in certain columns have been coded as '0' or '1' where '1' indicates a positive response and '0' indicates a negative. Grouping of answers for demographic questions for analysis is described in Supplementary Material 2 of the associated publication. This data were imported into SPSS to conduct a two-step cluster analysis and once each row was assigned to one of our three final clusters, the data was imported into R (3.5.2). We used the nnet package to conduct a multinomial regression analysis with behavioural variables that were not used in the cluster analysis so we could detect significant differences among these variables between our three clusters.
DOI: 10.6084/m9.figshare.14306868
title: Effects of the use of beach sand on mixed mortar properties: analysis of granulometric variation

description: ABSTRACT Several environmental impacts are due to the high consumption of river sand in the construction industry. This study aims to analyze the influence of the use of beach sand in order to use river sand for mortar productions. From the river sand, two variations were made: the first one had 70% of fine fraction (particles &lt;1.18 mm) and 30% of medium fraction (particles &lt;2.36 mm); and the second, 60% fine fraction and 40% average fraction. Portland cement (CP II-Z-RS) and hydrated lime (CHI type) were used as constant and binder ratio (in weight) of 1:3 (binder/aggregate), with variations of 1:1:6 and 1:2:9 (cement, lime and aggregate). The experimental program consisted of the analysis of the aggregates (by means of the size distribution and the bulk density) and the mortars in the fresh and hardened state. In the fresh state, the relation between the water consumption and the consistency and bulk density was determined. In the hardened state, the capillary coefficient, the rate of mass change and the mechanical strength to compression and traction were determined. The results indicated that the beach and river sand presented similar physical behaviour, although the first one has a more uniform particle size distribution and a greater amount of fines, directly reflecting the performance of the mortars.
DOI: 10.6084/m9.figshare.14306864
title: Shear Strength of a typical soil from Manaus, Brazil, stabilized with ceramic residue additive

description: ABSTRACT The purpose of this study is to determine the geotechnical behavior of a clayey surface soil typical to the Manaus region (Amazonas, Brazil), when mixed with ceramic powder from brick residue produced by potteries located in the county of Iranduba, Amazonas, Brazil, and with residual sand (the reference mixture), commonly used in pavements in the region. The density of soil solids was determined, as well as particle size, consistency limits, compaction parameters and mineralogical identification using of X-ray diffraction. The following blends were made: 90% natural soil + 10% additive, 70% natural soil + 30% additive and 50% natural soil + 50% additive. The blends were evaluated according to their physical properties (Atterberg limits, grain size, and compaction) and mechanical behavior (direct shear test). The results for the compositions indicated that the larger the proportion of ceramic residue and sand, the higher the values of the apparent dry density and the lower the optimum moisture; and, in particular, the addition of ceramic residue had a positive effect on the mechanical results, clearly demonstrated by the increase in the cohesion of the 10% blend. These results validate the potential of the residue for use in road work, in addition to the environmental benefits, either as a disposal alternative of an environmental liability or as a form of minimizing natural resource extraction.