cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14276982
title: Effects of the mechanical chiseling in the soil physical and agronomical attributes in an elephant grass crop

description: ABSTRACT Soil compaction is one of the major causes of yield losses in forage crops, especially those for the production of silage, due to heavy machinery traffic in seeding, management and harvesting operations. The soil chiseling could be an alternative to solve the problem. Thus, this work aimed to evaluate the effects of mechanical chiseling on the physical attributes in a Yellow Argisoil, and agronomic characteristics of elephant grass grown, in area with intensive traffic of machines. The experiment was conducted at the Campus of Agricultural Sciences - UNIVASF in the Submedium of the São Francisco River, in randomized blocks design with four replications; consisting of three depths chiseling: ESC 0 - without chiseling, ESC 15 - chiseling 0.00 to 0.15 m and ESC 30 - chiseling 0.00 to 0.30 m. It was evaluated the physical attributes of the soil before and after chiseling scarification, and soil bulk density, porosity and penetration resistance; and agronomical components of elephant grass: plant height and biomass production. The bulk density, porosity and resistance to penetration as well as biomass production were not affected by the depth of chiseling, due to the sand soil texture. The mechanical resistance to penetration proved to be the most sensitive attribute to identify the compacting and the effect of mechanical chiseling. It was not observed change in the soil physical properties in the treatments with chiseling, chiseling in the depth of 0.00 to 0.15 m and 0.00 to 0.30 m. The chiseling depth evaluated not affect the agronomical components of the elephant grass.
DOI: 10.6084/m9.figshare.14276975.v1
title: Agronomic performance of transgenic and isogenic corn hybrids in the state of Mato Grosso do Sul1

description: ABSTRACT Theoretically, isogenic hybrids should not present any differences in their genetic makeup due to recombinant DNA technology. However, these materials may behave differently in relation to adaptability and stability. This study aimed at evaluating the agronomic performance of transgenic corn and their isogenic hybrids in two locations in Mato Grosso do Sul, Brazil. Three isogenic simple hybrids and two transgenic varieties of each hybrid were evaluated. The first and second corn crop of 2013/14 were simultaneously analyzed in Dourados and Caarapó, two locations in the State of Mato Grosso do Sul, totaling four environments x season conditions that were evaluated.. A randomized complete block design with three replicates per location was used, and the treatments were arranged in a 3 × 3 factorial design (three genetically modified and three conventional hybrids), with three replicates per site. Characteristics such as plant height, ear height, male flowers, female flowers, and grain yield were evaluated. The parameters adaptability and stability were estimated using the Eberhart and Russell model. In all environments, transgenic hybrids showed higher average grain yield. Considering the environments, AG 7000, a conventional isogenic hybrid, obtained the highest average grain yield. The most stable and productive hybrids were DKB 390 VT PRO and AG 7000 YG, both transgenic. All assessed hybrids exhibited greater average plant height, ear height, and grain yield in Caarapó during the second corn crop, demonstrating that the environment at that site and time was more favorable.
DOI: 10.6084/m9.figshare.14276984
title: Obstruction and uniformity in drip irrigation systems by applying treated wastewater

description: ABSTRACT The use of wastewater in agriculture is an alternative to control surface water pollution, and helps to promote the rational use of water. Therefore, the objective of this study was to evaluate the obstruction and uniformity of application of treated wastewater in drip irrigation systems. The study was conducted in a greenhouse at the Universidade Federal de Campina Grande. The treatments were composed by the factorial combination of two factors: three types of water (supply water-ABAST, effluent of a constructed wetland system -WETLAND and upflow of anaerobic reactor effluent followed by constructed wetland system -UASB + WETLAND), and two drip irrigation systems (surface and subsurface), set in a completely randomized design, with four replications. The results indicated that the pH, suspended solids, total iron and coliforms of the WETLAND and UASB + WETLAND treatments represented a severe risk of clogging of drippers; the flow of the emitters increased as the service pressure was increased; values of CUC and CUD in surface and subsurface drip were classified as excellent in ABAST and WETLAND treatments. The degree of clogging reduced as pressure under surface and subsurface drip was increased.
DOI: 10.6084/m9.figshare.14276972.v1
title: Physico-chemical variability of cassava flour in the Território da Cidadania do Vale do Juruá, Acre

description: ABSTRACT The flour is a processed cassava food of great dietary importance, but with little standardization due to the craft manufacturing process. The aim of this study was to analyze the variability of artisanal cassava flour produced in Território da Cidadania do Vale do Juruá, Acre, and group the producing municipalities according to physico-chemical characteristics using multivariate analysis todetermine their influence on the flour quality. A total of 138 flour samples were collected in the cities of Cruzeiro do Sul, Mâncio Lima, Rodrigues Alves, Porto Walter and Marechal Thaumaturgo. Moisture, ash, total protein, ether extract, total fiber, total carbohydrate, energy value, titratable acidity, pH and water activity were determined in the samples. Data were analyzed using descriptive statistics and means compared with the Tukey test. and multivariate statistics in a complementary way, hierarchical cluster analysis with Euclidean distance and Ward method, and non-hierarchical, k-means, principal components analysis with correlation matrix, and backward stepwise discriminant analysis. The results showed that the flours met the quality standards required by the legislation. The different multivariate analyzes were consistent, indicating that the physico-chemical properties of the flours have a pattern of distribution, which suggests standards in the manufacturing process distributed according to the location of the municipalities analyzed. The most influencing characteristics for flour discrimination are acidity, pH, water activity and moisture, indicating that the mode of production has great influence on the quality of the flour produced.
DOI: 10.6084/m9.figshare.14276977.v1
title: Co-inoculation of Rhizobium tropici and Azospirillum brasilense in common beans grown under two irrigation depths

description: ABSTRACT The alternative technique of co-inoculation or mixed inoculation with symbiotic and non-symbiotic bacteria has been studied in leguminous plants. However, there are few field studies with common beans and under the influence of the amount of irrigated water. Thus, the objective of this study was to evaluate the efficiency of inoculation and co-inoculation of common beans with Rhizobium tropici and Azospirillum brasilense under two irrigation depths. The experiment was carried out in the winter of 2012 and 2013, in Selvíria, state of Mato Grosso do Sul. The experimental design was composed of randomized blocks in split-plot scheme with two irrigation depths in the plots (recommended for common beans and 75% of the recommended) and five forms of nitrogen (N) supply in the split-plots (control non-inoculated with 40 kg ha- 1 of N in topdressing, 80 kg ha- 1 of N in topdressing, A. brasilense inoculation with 40 kg ha-1 of N in topdressing, R. tropici inoculation with 40 kg ha-1 of N in topdressing, and co-inoculation of A. brasilense and R. tropici with 40 kg ha- 1 of N in topdressing) with four repetitions. Co-inoculation increased nodulation in the second year of cultivation. None of the evaluated treatments increased the grain yield in relation to non-inoculated control with 40 kg ha-1 of nitrogen in topdressing, which presented average yield of 2,200 kg ha-1. The use of 75% of the recommended irrigation depth provides similar grain yield to the recommended irrigation depth in common beans cropped in winter.
DOI: 10.6084/m9.figshare.14276983
title: Soil compaction in a sugarcane field at Baía Formosa, Rio Grande do Norte, Brazil

description: ABSTRACT Soil compaction is one of the main constraints imposed to growth of sugar cane root system, with consequences as reduction on plant ability to absorb water and nutrients. In this context, this study had as objective to identify regions in the field with different compaction levels, allowing the adoption of site specific management. The work was carried out at the Green Valley Sugarcane Mill, in Baía Formosa, RN, Brazil. Soil penetration resistance (RSP) was used as indicative parameter of soil compaction, and was assessed in an area of 113.59 ha, divided in 12 sugarcane fields, where 113 georeferenced points were located. Determinations were made in the 0-10, 11-20, 21-30 and 31-40 cm depths, by means of a soil penetrometer with automatic data acquisition system. Data were analyzed through descriptive statistics and geostatistical tools, which were used for evaluating spatial dependence of variables and draw contour maps, after kriging interpolation. Contour maps show regions in the area with different soil compaction levels. Subsoiling may be avoided in 18.80% of the total area, mainly in the fields 45 and 48. In other regions subsoiling must be performed deeper than 40 cm.
DOI: 10.6084/m9.figshare.14276980.v1
title: Seed inoculation with Azospirillum brasilense and N fertilization of corn in the Cerrado biome

description: ABSTRACT There is a great interest to reduce doses and increase efficiency of inputs in agriculture. One alternative to lower doses of N fertilizers in corn is seed inoculation with diazotrophic bacteria, which can fix atmospheric N in soil. This study aimed to evaluate the effect of N doses-in the absence and presence of Azospirillum brasilense-on plant nutritional status at different growth stages and on seed yield of corn. The experiment was conducted during the 2011/2012 production season on a typical cerrado soil in Uberlândia, Triângulo Mineiro. The experimental design was randomized blocks with six repetitions. The treatments consisted of five N doses and the absence or presence of Azospirillum brasilense (100 mL ha-1) as a seed inoculant. A commercial product with minimum concentration of 2x108 CFU mL-1 100 mL ha-1 was used. Inoculation with Azospirillum brasilense did not significantly affect corn macronutrient content and yield, except for foliar calcium and potassium at 200 kg N ha-1 at the V8 stage. Corn yield increased with N doses up to 150 kg N ha-1.
DOI: 10.6084/m9.figshare.14276982.v1
title: Effects of the mechanical chiseling in the soil physical and agronomical attributes in an elephant grass crop

description: ABSTRACT Soil compaction is one of the major causes of yield losses in forage crops, especially those for the production of silage, due to heavy machinery traffic in seeding, management and harvesting operations. The soil chiseling could be an alternative to solve the problem. Thus, this work aimed to evaluate the effects of mechanical chiseling on the physical attributes in a Yellow Argisoil, and agronomic characteristics of elephant grass grown, in area with intensive traffic of machines. The experiment was conducted at the Campus of Agricultural Sciences - UNIVASF in the Submedium of the São Francisco River, in randomized blocks design with four replications; consisting of three depths chiseling: ESC 0 - without chiseling, ESC 15 - chiseling 0.00 to 0.15 m and ESC 30 - chiseling 0.00 to 0.30 m. It was evaluated the physical attributes of the soil before and after chiseling scarification, and soil bulk density, porosity and penetration resistance; and agronomical components of elephant grass: plant height and biomass production. The bulk density, porosity and resistance to penetration as well as biomass production were not affected by the depth of chiseling, due to the sand soil texture. The mechanical resistance to penetration proved to be the most sensitive attribute to identify the compacting and the effect of mechanical chiseling. It was not observed change in the soil physical properties in the treatments with chiseling, chiseling in the depth of 0.00 to 0.15 m and 0.00 to 0.30 m. The chiseling depth evaluated not affect the agronomical components of the elephant grass.
DOI: 10.6084/m9.figshare.5720341
title: Potential of hybrids and segregating populations of pumpkin for oil content in seeds and shrub-type plants

description: ABSTRACT The objective of this study was to characterize and evaluate hybrid and segregating populations of crosses between accessions of Cucurbita moschata, with oil potential, and cultivars that possess the gene of dwarfism (bush), aiming at obtaining genotypes with high seed oil yield and reduced plant architecture. The experimental design was in randomized blocks with three replicates. Each replicate consisted of five plants of the BGH-7319 and BGH-7765 accessions, of the cultivars Piramoita and Tronco Verde and the F1 hybrids (BGH-7319 × Piramoita, BGH-7319 × Tronco Verde, BGH-7765 × Tronco Verde), considering the three central plants of the plots as useful. Thirty plants for each of the three F2 populations ('Population 1 F2', 'Population 2 F2', 'Population 3 F2') were evaluated. Twenty-eight phenological descriptors were applied, nine of which were related to the vegetative phase of the plants, 12 referring to the fruits, and seven to the seeds. The data were subjected to analysis of variance and the means of the treatments were compared with the means of the controls at 5% of probability by Dunnett’s test. In predicting the potential of populations to obtain superior strains, the methodology of Jinks & Pooni (1976) was used. The hybrid BGH-7319 × Tronco Verde stood out for the characteristics of seed mass per fruit, mass of 100 seeds, and seed length, width, and thickness, being promising for the oil content of the seeds. The 'Population 2 F2', derived from the crossbreeding between BGH-7319 and Tronco Verde was to the most promising for plant with shrub-type growth.
DOI: 10.6084/m9.figshare.5720341.v1
title: Potential of hybrids and segregating populations of pumpkin for oil content in seeds and shrub-type plants

description: ABSTRACT The objective of this study was to characterize and evaluate hybrid and segregating populations of crosses between accessions of Cucurbita moschata, with oil potential, and cultivars that possess the gene of dwarfism (bush), aiming at obtaining genotypes with high seed oil yield and reduced plant architecture. The experimental design was in randomized blocks with three replicates. Each replicate consisted of five plants of the BGH-7319 and BGH-7765 accessions, of the cultivars Piramoita and Tronco Verde and the F1 hybrids (BGH-7319 × Piramoita, BGH-7319 × Tronco Verde, BGH-7765 × Tronco Verde), considering the three central plants of the plots as useful. Thirty plants for each of the three F2 populations ('Population 1 F2', 'Population 2 F2', 'Population 3 F2') were evaluated. Twenty-eight phenological descriptors were applied, nine of which were related to the vegetative phase of the plants, 12 referring to the fruits, and seven to the seeds. The data were subjected to analysis of variance and the means of the treatments were compared with the means of the controls at 5% of probability by Dunnett’s test. In predicting the potential of populations to obtain superior strains, the methodology of Jinks & Pooni (1976) was used. The hybrid BGH-7319 × Tronco Verde stood out for the characteristics of seed mass per fruit, mass of 100 seeds, and seed length, width, and thickness, being promising for the oil content of the seeds. The 'Population 2 F2', derived from the crossbreeding between BGH-7319 and Tronco Verde was to the most promising for plant with shrub-type growth.
DOI: 10.6084/m9.figshare.14276983.v1
title: Soil compaction in a sugarcane field at Baía Formosa, Rio Grande do Norte, Brazil

description: ABSTRACT Soil compaction is one of the main constraints imposed to growth of sugar cane root system, with consequences as reduction on plant ability to absorb water and nutrients. In this context, this study had as objective to identify regions in the field with different compaction levels, allowing the adoption of site specific management. The work was carried out at the Green Valley Sugarcane Mill, in Baía Formosa, RN, Brazil. Soil penetration resistance (RSP) was used as indicative parameter of soil compaction, and was assessed in an area of 113.59 ha, divided in 12 sugarcane fields, where 113 georeferenced points were located. Determinations were made in the 0-10, 11-20, 21-30 and 31-40 cm depths, by means of a soil penetrometer with automatic data acquisition system. Data were analyzed through descriptive statistics and geostatistical tools, which were used for evaluating spatial dependence of variables and draw contour maps, after kriging interpolation. Contour maps show regions in the area with different soil compaction levels. Subsoiling may be avoided in 18.80% of the total area, mainly in the fields 45 and 48. In other regions subsoiling must be performed deeper than 40 cm.
DOI: 10.6084/m9.figshare.14276984.v1
title: Obstruction and uniformity in drip irrigation systems by applying treated wastewater

description: ABSTRACT The use of wastewater in agriculture is an alternative to control surface water pollution, and helps to promote the rational use of water. Therefore, the objective of this study was to evaluate the obstruction and uniformity of application of treated wastewater in drip irrigation systems. The study was conducted in a greenhouse at the Universidade Federal de Campina Grande. The treatments were composed by the factorial combination of two factors: three types of water (supply water-ABAST, effluent of a constructed wetland system -WETLAND and upflow of anaerobic reactor effluent followed by constructed wetland system -UASB + WETLAND), and two drip irrigation systems (surface and subsurface), set in a completely randomized design, with four replications. The results indicated that the pH, suspended solids, total iron and coliforms of the WETLAND and UASB + WETLAND treatments represented a severe risk of clogging of drippers; the flow of the emitters increased as the service pressure was increased; values of CUC and CUD in surface and subsurface drip were classified as excellent in ABAST and WETLAND treatments. The degree of clogging reduced as pressure under surface and subsurface drip was increased.
DOI: 10.6084/m9.figshare.14276986
title: Growth performance of castor bean hybrids under different plant densities

description: ABSTRACT Castor bean grown at high plant densities can increase yield due to increased light interception and reduction in sink demand. The objective of this study was to evaluate the effect of plant density on growth of castor bean hybrids. The experiment was conducted in Botucatu, SP, Brazil, in a split plot randomized block design, with four replications, in 2011 and 2012. The main plot consisted of the sampling times and the subplots consisted of a 3x3 factorial, with the 3 genotypes in the first factor and the 3 plant densities in the second factor. The variables analyzed were: dry mass of leaves, stems, racemes, and total dry matter, which were measured at 30, 60, 90, 120 and 150 days after emergence (DAE). Data were examined for significant differences using analysis of variance followed by the F test (p &lt; 0.05). When interaction was found between the factors and sampling the means were analyzed by regression analysis (p &lt; 0.05). Growth performance was higher in 2012 because of the greater water availability. In 2011, under lower rainfall, there was less branching resulting in cycle end, with total leaf loss. High plant densities partially suppress the development of higher-order structures, especially when associated with water restriction.
DOI: 10.6084/m9.figshare.5667982
title: Response of potato cultivars to increasing levels of NPK

description: ABSTRACT Potato cultivation has the capacity to respond to higher fertilization levels than other crops. However, the exaggerated fertilization can result in increased production cost and promote nutritional imbalance of the plant, in addition to contamination of the environment. Thus, the aim of this work was to evaluate the response of potato cultivars, bred and introduced to increasing levels of NPK, in relation to yield, specific gravity, and fry color. The experiment was carried out in Haplustox soil, in Canoinhas - SC, Brazil, in the spring season of 2014. The treatments consisted of four doses of NPK 04-14-08 fertilizer applied at 0, 3, 6, and 9 t ha-1. The experiment was conducted in a completely randomized block design (RCBD) replicated three times. Treatments were arranged in a split-plot design with cultivars as main plots and NPK doses as sub-plots. At 120 days after planting, the characters evaluated were analyzed statistically by variance analysis and polynomial regression. It was found that with increasing doses of NPK fertilizer, there is an increase in the number and size of the tubers produced; however, it does not alter the specific gravity of tubers, but there was improvement in the fry color, except for BRS Ana that had lighter fry color. The cultivars developed for local conditions, BRS Ana and BRS F63 Camila, were more productive than the introduced cultivars, Agata and Asterix, both at higher and lower doses of fertilizer. BRS F63 Camila was the most responsive cultivar to increase of fertilizer. Depending on the cultivar, the maximum technical viability estimated was the maximum tested value of 9 t ha-1 of NPK in the formula 04-14-08, as in the case of BRS F63 Camila. However, the maximum economic viability estimated ranged from 5.77 to 9.00 t ha-1.
DOI: 10.6084/m9.figshare.5667982.v1
title: Response of potato cultivars to increasing levels of NPK

description: ABSTRACT Potato cultivation has the capacity to respond to higher fertilization levels than other crops. However, the exaggerated fertilization can result in increased production cost and promote nutritional imbalance of the plant, in addition to contamination of the environment. Thus, the aim of this work was to evaluate the response of potato cultivars, bred and introduced to increasing levels of NPK, in relation to yield, specific gravity, and fry color. The experiment was carried out in Haplustox soil, in Canoinhas - SC, Brazil, in the spring season of 2014. The treatments consisted of four doses of NPK 04-14-08 fertilizer applied at 0, 3, 6, and 9 t ha-1. The experiment was conducted in a completely randomized block design (RCBD) replicated three times. Treatments were arranged in a split-plot design with cultivars as main plots and NPK doses as sub-plots. At 120 days after planting, the characters evaluated were analyzed statistically by variance analysis and polynomial regression. It was found that with increasing doses of NPK fertilizer, there is an increase in the number and size of the tubers produced; however, it does not alter the specific gravity of tubers, but there was improvement in the fry color, except for BRS Ana that had lighter fry color. The cultivars developed for local conditions, BRS Ana and BRS F63 Camila, were more productive than the introduced cultivars, Agata and Asterix, both at higher and lower doses of fertilizer. BRS F63 Camila was the most responsive cultivar to increase of fertilizer. Depending on the cultivar, the maximum technical viability estimated was the maximum tested value of 9 t ha-1 of NPK in the formula 04-14-08, as in the case of BRS F63 Camila. However, the maximum economic viability estimated ranged from 5.77 to 9.00 t ha-1.