Yield Of Soybean Cultivars Research Articles

Produção e qualidade fisiológica de sementes de soja em diferentes ambientes de cultivo

The objective of this study was to evaluate the physiological quality and seed yield of soybean cultivars produced in Campo Mourao and Guarapuava, Parana Sta...

Atributos físicos do solo e produtividade da soja em sistema de integração lavoura-pecuária com braquiária e soja

A integração lavoura-pecuária por meio da sucessão entre pastagem de braquiária no outono/inverno e culturas de grãos no verão constitui-se em uma opção para aumentar e diversificar a renda do produtor e melhorar a qualidade do sistema plantio direto. Com o objetivo de avaliar o efeito da época de dessecação da pastagem ou da pressão de pastejo por bovinos sobre atributos físicos do solo e a produtividade da soja em um sistema de integração lavoura-pecuária (SILP), foi conduzido um experimento sobre um Latossolo Vermelho Distroférrico. Nas parcelas principais, foram aplicadas pressões de pastejo equivalentes a 6,9; 9,4; e 16,5 unidades animais por hectare durante 19 dias em pastagem de Brachiaria brizantha cv. 'Xaraes', cuja fitomassa foi dessecada 30 dias antes da semeadura da soja (DAS). Também foram conduzidos tratamentos sem pastejo, nos quais a fitomassa foi dessecada aos 30, 44 e 52DAS. Foi determinada a fitomassa remanescente da pastagem, densidade, porosidade e resistência à penetração do solo e a produtividade das cultivares de soja 'BRS 294RR' e 'BRS 255RR', semeadas em subparcelas. As alterações nos atributos físicos do solo pelo pisoteio se concentraram na camada de 0,0-0,05m, contudo as maiores pressões de pastejo aumentaram o grau de compactação do solo até a camada de 0,2-0,3m. A produtividade da cultivar 'BRS 294RR' aumentou e a da cultivar 'BRS 255RR' não foi afetada pelo incremento da pressão de pastejo, demostrando que há diferença de resposta entre os genótipos ao grau de compactação do solo e, principalmente, à fitomassa remanescente da pastagem. A produtividade da soja em SILP com alta produção de matéria seca de B. brizantha é afetada pelo intervalo entre a dessecação da pastagem e a semeadura da cultura.

CRESCIMENTO E PRODUTIVIDADE DE SOJA EM DIFERENTES ÉPOCAS DE SEMEADURA NO OESTE DA BAHIA

O objetivo deste trabalho foi avaliar o desempenho vegetativo e produtivo de cinco cultivares de soja com diferentes ciclos de maturação indicados para a região Oeste da Bahia, em diferentes épocas de semeadura. Os ensaios foram instalados no campo experimental da Fundação Bahia, na Fazenda Maria Gabriela, município de São Desidério - BA, no ano agrícola 2006/2007. O delineamento experimental foi em blocos casualizados no esquema fatorial 4 X 5 (quatro épocas de semeadura: primeira época 29/11/2006, segunda época 14/12/2006, terceira época 28/12/2007, quarta época 12/01/2007 e cinco cultivares: M-SOY 8411, BRS Corisco, BRS 263 [Diferente], BRS Barreiras e M-SOY 9350) com quatro repetições. Para avaliar o desempenho vegetativo foi realizado o acompanhamento fenológico durante todo ciclo da cultura e efetuadas coletas quinzenais de cinco plantas/parcela, iniciando aos trintas dias após a emergência (DAE) até a maturação fisiológica (R7), para determinação da massa de matéria seca, da área foliar, do número de folhas e da altura das plantas. Para avaliar o desempenho produtivo foi determinada a produtividade de grãos na área útil de cada parcela. A época de semeadura influencia o desempenho vegetativo e produtivo dos cultivares de soja. O atraso na época de semeadura promove redução no ciclo dos cultivares de soja, principalmente na fase reprodutiva. Ecofisiologicamente, as semeaduras tardias 28/12/2006 e 12/01/2007 não são favoráveis à obtenção de produtividades superiores para a soja no Oeste da Bahia.

Intervalo hídrico ótimo e produtividade de cultivares de soja

Determinar o intervalo hídrico ótimo e sua relação com a produtividade de soja, foi o que se objetivou com o presente estudo, razão por que se conduziu um experimento em Jaboticabal, SP, em Latossolo Vermelho de textura média. O delineamento experimental foi inteiramente casualizado, em parcelas subdivididas (seis níveis de compactação e quatro cultivares), com quatro repetições. Os níveis de compactação, foram: T0 = 0; T1* = 1; T1 = 1; T2 = 2; T4 = 4 e T6 = 6 passadas, no mesmo local, de um trator de 11 toneladas, perfazendo toda a superfície do solo. No tratamento T1* a compactação ocorreu quando o solo estava mais seco. Em dezembro de 2003 foram semeadas as cultivares de soja (Glycine max) IAC Foscarin 31, MG/BR 46 (Conquista), BRS/MG 68 (Vencedora) e IAC 8 - 2. Após a semeadura, coletaram-se amostras indeformadas de solo nas camadas de 0,03-0,06; 0,08-0,11; 0,15-0,18; e 0,22-0,25 m, para determinação da curva de retenção de água, de resistência do solo à penetração e do intervalo hídrico ótimo (IHO). Segundo o modelo do IHO, a densidade do solo crítica (Dsc) à produtividade de soja varia entre as cultivares nos valores de 1,56 a 1,64 Mg m-3. A densidade do solo, a partir da qual a produtividade das cultivares de soja decresceu, foi superior à Dsc.

ダイズの苗立ち、窒素固定、収量に対する新規地下灌漑システム（FOEAS）の効果（予備実験）

ダイズの苗立ち、窒素固定、収量に対する新規地下灌漑システム（FOEAS）の効果（予備実験）

Quantitative Trait Loci for Soybean Seed Yield in Elite and Plant Introduction Germplasm

Genetic improvement for yield in soybean [Glycine max (L.) Merr.] has been accomplished by breeding within a narrow elite gene pool. Plant introductions (PIs) may be useful for obtaining additional increases in yield if unique and desirable alleles at quantitative trait loci (QTL) can be identified. The objectives of the study were to identify QTL for yield in elite and PI germplasm and to determine if the PIs possessed favorable alleles for yield. Allele frequencies were measured with simple sequence repeat (SSR) markers in three populations, designated AP10, AP12, and AP14, that differed in their percentage of PI parentage. AP10 had 40 PI parents, AP12 had 40 PI and 40 elite parents, and AP14 had 40 elite parents. Four cycles of recurrent selection for yield had been conducted in the three populations. Allele frequencies of the highest‐yielding C4 lines in the three populations were compared with the parents used to form the populations of the initial cycles. Allele flow was simulated to account for genetic drift. Fifty‐four SSRs were associated with 43 yield QTL. Seven of the QTL had been identified in previous research. Sixteen favorable marker alleles were unique to the PI parents. The genes associated with the unique PI alleles merit further investigation for their potential to increase yield of soybean cultivars.

Morphology, forage and seed yield of soybean cultivars of different maturity grown as a forage crop in Turkey

Soybean [Glycine max (L.) Merr.] has long been used as a forage crop but its morphological development and forage potential have not been studied extensively. A study was conducted using oilseed soybean cultivars of different maturity to determine their morphological development, forage yield, seed components and seed yield at the University of Ankara, Turkey. Five soybean cultivars OAC Salem (earliest), OAC Bayfield (midearly), OAC Eclipse (mid-early but later than OAC Bayfield), OAC Glencoe (full-season soybean) and SA.88 (late), were used in the study conducted in 2000 and 2001. The full-season cultivar OAC Glencoe was the tallest cultivar, and had the highest levels of fresh and dry matter yield and crude protein yield among soybean cultivars in both years. Therefore, OAC Glencoe is considered to be the most suitable soybean cultivar for forage production when intercropped with corn in Ankara region of Turkey. However, attention should be given to the earliest maturing cultivar OAC Salem that had the highest seed yield and better relative seed composition of all the cultivars. Key words: Forage, soybean, cultivar, morphology, development

Economics of Fall Tillage for Early and Conventional Soybean Plantings in the Midsouthern USA

Conventional soybean [Glycine max (L.) Merr.] production in the midsouthern USA has involved planting Maturity Group (MG) V and later cultivars in May and later months in a seedbed that has been shallow‐tilled in the fall or spring just before planting. Moisture deficits that frequently occur from April through September reduce yield of soybean cultivars used in this traditional production system. Field experiments using MG IV ‘DP 3478’ and MG V ‘Hutcheson’ were conducted at Stoneville, MS (33°26′ N lat) on Sharkey clay (very fine, smectitic, thermic chromic Epiaquert) in 1995, 1996, and 1998. The objective was to compare yields and economic returns from April and May or later plantings of MG IV and V soybean cultivars grown without irrigation on clay soil following shallow (ST) and deep (DT) fall tillage. Net returns were calculated as the difference between income and all direct and indirect costs, excluding those for land, management, and general farm overhead. Costs for the DT treatment were $22 to $27 ha−1 greater than those for ST. Yields and net returns resulting from DT were greater than those from ST in 1 yr. Yields and net returns from April plantings were greater than those from May or later plantings in 2 of the 3 yr. These results indicate that April plantings will result in greater yields and net returns over the long term, but increased profits from DT are infrequent.

Response of Inoculum and Fertilizers on Nodulation and Economic Yield of Soybean Cultivars

Response of Inoculum and Fertilizers on Nodulation and Economic Yield of Soybean Cultivars

Effect of manganese deficiency on seed yield of soybean cultivars

Abstract Manganese (Mn) deficiency is a problem in soybeans grown on high pH soils, which to date can only be controlled by chemical fertilizers. In view of the success of genetic resistance in reducing yield losses associated with iron (Fe) deficiency chlorosis, a one year study was initiated to determine whether genetic resistance could be used to control Mn deficiency related yield losses. For this study, twenty soybean genotypes ranging from Group I maturity to Group III maturity were planted at five locations which had previously exhibited symptoms of Mn deficiency. Individual plots were rated for Mn‐deficiency symptoms on a 1–5 scale (1 = no yellowing to 5 = severe yellowing with some necrosis) at the Rl growth stage and plants in the center rows were harvested for yield. The mean Mn‐deficiency rating was 2.8 with a range from 1.8 for NKS 23–03 and P9181 to a 3.9 for A3205. The mean yield was 3059.3 kg/ha with a range from 3670.6 for A3205 to 2567.5 kg/ha for Chapman. The correlation between Mn‐defi...

Countermeasures of Decreased Yield by Continuously Cropped Soybeans. 8. Growth and yield of soybean cultivars with different maturing stage as affected by a plowing-in of a barley

Countermeasures of Decreased Yield by Continuously Cropped Soybeans. 8. Growth and yield of soybean cultivars with different maturing stage as affected by a plowing-in of a barley

EFFECT OF ROOT ROT INFECTION ON YIELD OF SOYBEAN CULTIVARS

Annals of Applied BiologyVolume 108, Issue S1 p. 176-177 EFFECT OF ROOT ROT INFECTION ON YIELD OF SOYBEAN CULTIVARS A.C. Uwala, A.C. Uwala National Cereals Research Institute, Ibadan, NigeriaSearch for more papers by this author A.C. Uwala, A.C. Uwala National Cereals Research Institute, Ibadan, NigeriaSearch for more papers by this author First published: April 1986 https://doi.org/10.1111/aab.1986.108.s1.176AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume108, IssueS1April 1986Pages 176-177 RelatedInformation

Effects of Application of Nematicide or Insecticide on the Growth and Yield of Soybean Cultivars Having Different Leveles of Resistance to Soybean Cyst Nematode

Effects of Application of Nematicide or Insecticide on the Growth and Yield of Soybean Cultivars Having Different Leveles of Resistance to Soybean Cyst Nematode

Root growth, nutrient uptake and yield of soybean cultivars grown in the field

Abstract Soybean (Glycine max L. Merr.) cultivars differ in their root morphology and their nutrient uptake capabilities. The relation between root growth, P and K uptake, and grain yield was investigated using eight cultivars grown in the field on Raub (Aquic Argiudoll) silt loam which received 49 kg P/ha and 93 kg K/ha. Hobbit (maturity group III, determinate) was among the highest in grain yield, P and K uptakes, and root system length. However, this cultivar was intermediate in its relative efficiency to utilize P and K to produce grain yield; among the most efficient cultivars were Asgrow 3127 (maturity group II) and Williams‐79 (maturity group III). The hay cultivar, Wilson‐6, was the least efficient. It was concluded that even though grain yield was correlated with nutrient uptake, selection for higher yields was not necessarily a selection for higher efficiency in utilization of fertilizer for grain production.

Effects of Flooding Treatments and Manure Application to the Soil Infested with Soybean Cyst Nematode on the Growth and Yield of Soybean Cultivars

Effects of Flooding Treatments and Manure Application to the Soil Infested with Soybean Cyst Nematode on the Growth and Yield of Soybean Cultivars