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Search Results: 1 - 10 of 19411 matches for " glycine max (l.) merrill. "
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Interaction between Soybean Cultivars and Seed Density  [PDF]
Igor Oliveri Soares, Pedro Milanez de Rezende, Adriano Teodoro Bruzi, Alan Mario Zuffo, Everton Vinicius Zambiazzi, Vanoli Fronza, Cícero Monti Teixeira
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.69142
Abstract: Plant, environmental conditions and management type will determine final crop yield. Enhanced yield can be reached by using well-adapted and potentially productive genotypes; all of them ally to crop cultural practices and management. Among these, seed density stands out, once it interferes with plant morphology and competition for water and nutrients. Thus, this study aimed to evaluate the effect of varied seed densities on agronomic traits in soybean, besides identifying cultivars with wide adaptability to different environments and seed densities. Six soybean cultivars were assessed under four seed densities (100, 200, 300 and 400 thousand plants·ha-1), in nine different environments from Minas Gerais State, Brazil. The experimental design was a completely randomized block design with three replications. The BRSMG 760SRR and BRSMG 820RR cultivars had the best average performance independent of the environments and seed densities. The seed density of 300 thousand plants per hectare showed to be as the most adequate for soybean cultivation on the evaluated environments. Furthermore, seed density interacted with the agronomic traits in soybean.
Performance of Conventional and Transgenic Soybean Cultivars in the South and Alto Paranaiba Regions of Minas Gerais, Brazil  [PDF]
Isabela Pereira de Lima, Adriano Teodoro Bruzi, Flávia Barbosa Silva Botelho, Everton Vinicius Zambiazzi, Igor Oliveri Soares, Alan Mario Zuffo
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.69138
Abstract: The aim of this study was to compare transgenic and conventional soybean cultivars in regard to yield performance and agronomic traits. Six soybean cultivars were tested: three conventional cultivars and their three isogenic transgenic derivatives, in two locations, Lavras and Patos de Minas in Minas Gerais, Brazil, in the 2012/13 crop season. Data on yield (kg·ha-1), plant height (cm), and tolerance to lodging were collected. The cultivars had different responses. The cultivar BRS/MG46 Conquista had lower yields than its isogenic derivative BRS Valiosa RR, but this was not seen with the conventional cultivar M-SOY 6101, which produced more than its isogenic derivative M-SOY 7211 RR. Between the isogenic cultivars BRS/MG68 Vencedora and BRS Favorita RR, there were no significant differences. Nevertheless, the contrast between the mean values of the transgenic and conventional cultivars shows that the conventional cultivars had mean values greater than the transgenic cultivars.
Evaluation of Soybean Cultivars of Contrasting Cycles according to the Level of Investment in Fertilization  [PDF]
Emerson Borghi, Eduardo de Paula Sim?o, álvaro Vilela de Resende, Jo?o Carlos Cardoso Galv?o, Sebasti?o Pedro da Silva Neto, André Ferreira Pereira
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.812202
Abstract: The objective of the present study was to characterize the duration of the phenological stages, the agronomic characteristics and grain yield in soybean cultivars with contrasting cycles and indeterminate growth type, submitted to different fertilization investment environments under no-tillage system in the central region of Minas Gerais. The work was conducted under field conditions, in an experimental area of Embrapa Maize and Sorghum, in Sete Lagoas, MG, in the harvest of 2015/2016. Ten soybean cultivars with different relative maturity groups (RMG) were studied, representing almost all RMG materials currently sown in Minas Gerais, in two environments with different levels of fertilizer investment. The variables were submitted to analysis of joint variance, in order to verify the existence of interaction between cultivars and investment in fertilization environments. Fertilizer investment levels influence grain yield of soybean cultivars of contrasting cycles. The higher height of the soybean plants implies higher lodging and lower grain yield. This situation is aggravated by the greater investment in fertilization. The difference between the cycles of the cultivars is in the duration of the vegetative stages, being greater in the later cultivars.
α-Tocopherol levels in natural and artificial aging of soybean seeds
Giurizatto, Maria Izabel Krüger;Ferrarese-Filho, Osvaldo;Ferrarese, Maria de Lourdes Lucio;Robaina, Antonio Dias;Gon?alves, Manoel Carlos;Cardoso, Cláudia Andréa Lima;
Acta Scientiarum. Agronomy , 2012, DOI: 10.4025/actasciagron.v34i3.12660
Abstract: tocopherols are well known constituents of vitamin e, and the main antioxidants in soybean. are natural antioxidants and stabilizers that can inhibit lipid degradation, reducing non-enzymatic oxidation of these compounds during storage of seeds, germination and initial development of seedlings. the objective of this work was to determine the level of α-tocopherol in four soybean seeds cultivars naturally and artificially aged. seeds of four soybean cultivars stored from 0 to 180 days in a dry chamber (natural aging) and subjected to high temperature and humidity (artificial aging) were analyzed for α-tocopherol content. the quantification of α-tocopherol in the soybean seeds was performed by high performance liquid chromatography (hplc) combined with the soxhlet extraction method. significant differences in α-tocopherol levels in seeds were observed for all cultivars and storage times. the α-tocopherol contents of the soybean seeds showed linear correlations with an increasing period of storage for all the cultivars studied. however, the artificially aged seeds had a higher content of α-tocopherol than those naturally aged.
Compara??o de procedimentos de sele??o para produ??o de gr?os em popula??es de soja
Reis, Edésio Fialho dos;Reis, Múcio Silva;Cruz, Cosme Dami?o;Sediyama, Tuneo;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000300006
Abstract: this study aimed to predict the genetic gain for grain production by applying different selection procedures and to choose, among the studied populations, the most promising one regarding gain expectation. four selection strategies were used: selection among and within families; combined selection and individual selection for grain production; as well as for selection free from weights and parameters, number of days and plant height at maturation. generation f5 individuals were selected, placed and observed in the field following the design standard-cultivars among the segregating lines, during the agricultural year of 1996/1997, in vicosa, minas gerais. the results indicated that, considering the family in the selective process, combined selection was the most promising strategy. however, individual selection showed the highest expectation of genetic gain among the four strategies. the cross between the parents ceps 89-26 and ft-cristalina presented the highest expectation of genetic gain.
Popula??es de plantas e estratégias de manejo de irriga??o na cultura da soja
Kuss, Rejane Cristina Roppa;K?nig, Osvaldo;Dutra, Luiz Marcelo Costa;Bellé, Rogério Ant?nio;Roggia, Samuel;Sturmer, Glauber Renato;
Ciência Rural , 2008, DOI: 10.1590/S0103-84782008000400036
Abstract: the objective of these experiments was to verify the effect of irrigation management and plant population on grain yield of soybean sown after recommends period. the experiment was conducted from january to may 2005 at federal university of santa maria. the experiment design was randomized blocks with subdivided bits in fourth repetitions. in the main bits were distributed three irrigation management: 1) no irrigated; 2) irrigated all cycle; and 3) irrigated in critical periods. in subplot were distributed both plants populations (250.000 and 400.000 plants ha-1). for the irrigated plants ll cycle or only in critical periods, the grain yield did not differ between tried populations. the grain yield of no irrigated plants had an increment of 21% with the increase of plant population to 400.000 plants ha-1.
Comprimento e índice de expans?o radial do hipocótilo de cultivares de soja
Costa, José Antonio;Pires, Jo?o Leonardo Fernandes;Thomas, André Luis;Alberton, Marilac;
Ciência Rural , 1999, DOI: 10.1590/S0103-84781999000400006
Abstract: the soybean seedling emergence is a function of the hypocotyl, responsible for the cotyledon elevation above the soil surface. the greater the hypocotyl length and diameter, the greater the seeddlings? capacity to emerge and overcome the resistence do to the soil surface crusting. the purpose of this work was to evaluate the hypocotyl length and swelling index (hsi) of soybean cultivars in different seed size. the experiment was performed at the faculdade de agronomia da universidade federal do rio grande do sul (fa/ufrgs). the hypocotyl length and hsi was determined in seventeen cultivars in three seed sizes (> 6.3mm; between 5.6 and 6.3mm and between 4.75 and 5.6mm in diameter). the cultivars had an average hypocotyl length between 8 and 11cm. the larger seeds produced seedlings with shorter hypocotyls, compared to medium-sized or small seeds, which produced longer ones. the hypocotyl hsi increased with the increase in seed size.
In-furrow inoculation of soybean as alternative to fungicide and micronutrient seed treatment
Campo, Rubens José;Araujo, Ricardo Silva;Mostasso, Fábio Luís;Hungria, Mariangela;
Revista Brasileira de Ciência do Solo , 2010, DOI: 10.1590/S0100-06832010000400010
Abstract: soybean is a major grain crop in brazil, and yields can be considerably improved by inoculation with selected bradyrhizobium strains. however, the incompatibility between inoculation and seed treatments with fungicides and micronutrients represents a major barrier to the achievement of high rates of biological n2 fixation. inoculation practices that can alleviate the negative effects of agrochemicals must therefore be found and in-furrow inoculation seems to be an attractive alternative. this study reports the results of seven field experiments conducted in three growing seasons in brazil; three in soils previously cropped with inoculated soybean (> 104 cells g-1 of soil of bradyrhizobium), and four in areas where the crop was sown for the first time (< 102 cells g-1 of soil of bradyrhizobium). the compatibility with fungicides and micronutrients was compared in seeds inoculated with peat or liquid inoculants, or treated with different doses of liquid inoculant in-furrow. in areas with established bradyrhizobium populations, seed-applied agrochemicals did generally not affect nodulation, but also did not increase yields, while inoculation always increased n grain accumulation or yield, and n fertilizer decreased both nodulation and yield. where soybean was sown for the first time, the seed treatment with agrochemicals affected nodulation when applied together with peat or liquid inoculant. in-furrow inoculation alleviated the effects of seed treatment with agrochemicals; the best performance was achieved with high bradyrhizobium cell concentrations, with up to 2.5 million cells seed-1.
Dissimilaridade genética e análise de trilha de cultivares de soja avaliada por meio de descritores quantitativos
Rigon, Jo?o Paulo Gonsiorkiewicz;Capuani, Silvia;Brito Neto, José Félix de;Rosa, Genésio Mário da;Wastowski, Arci Dirceu;Rigon, Carlos Alberto Gonsiorkiewicz;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000200012
Abstract: in addition to the evaluations among genotypes, the use of multivariate techniques enables to restrict errors, mainly concerning genetic diversity, and therefore to predict combinations with greater heterotic effect, and the greater possibility of recovery of superior genotypes. the objective of this study was to evaluate the genetic divergence between 18 soybean cultivars based on six morphological characteristics. path analysis was performed to verify the contribution of direct and indirect characters on grain yield. the mahalanobis distance has founded techniques of both tocher method and dendrogram by single linkage. five different groups were formed: with nine genotypes considered similar among them; while the cultivars cep 59, netuno and urano formed groups isolated by the two grouping methods. the path analysis showed that the indirect characters had little influence on grain yield, with significant direct relationship with mass of 100 grain, and cultivars tertulha and cep 53 standing out with grain yields above 3.7 t.ha-1.
Accelerated aging and seedling field emergence in soybean
Torres, Reynaldo Melo;Vieira, Roberval Daiton;Panobianco, Maristela;
Scientia Agricola , 2004, DOI: 10.1590/S0103-90162004000500002
Abstract: information regarding the relationship between laboratory seed vigor testing and seedling field emergence is very important to estimate seed performance after sowing and help producers adopt the best procedures to improve stand establishment. the objective of the present study was to relate accelerated aging (aa) test results to soybean [glycine max (l.) merrill] seedling field emergence results based on data obtained over three agricultural years. the following evaluations were made: seed water content, standard germination, accelerated aging, electrical conductivity, and seedling field emergence. there was a close association between planting environmental conditions, seed physiological quality and seedling field emergence. the most accurate predictions were obtained for aa values > 90%, when field emergence was higher than 80% (r2 = 0.90). based on the results it was concluded that the aa test provided an accurate estimate of field emergence of soybean seedlings. however, as seedbed environmental conditions became less favorable, the ability of the aa test to estimate field performance significantly decreased.
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