Stability of soybean yield through different sowing periods

Abstract

-Soybean yield is highly affected by sowing period and there are significant productivity losses when sowings are done outward a relatively restricted period in many regions of Brazil. Breeding cultivars less sensitive to photoperiod and to temperature variations is desirable for adaptation to wider sowing period and wider latitude range and also make irrigated soybean cultivation possible during the fall-winter seasons in frost free regions. The possibility of selecting high yielding and stable lines for yield during various sowing periods was studied by analyzing the behavior of 100 non-selected advanced lines (F 9 and F 10 ), from each one of all possible biparental crosses involving the genotypes BR85-29009, OCEPAR 8, FT-2, and BR-13. Experiments were set up in a completely randomized design with single-plant hill plots and received supplementary irrigation. Sowing was on Sept 27, Oct 20, Nov 17, and Dec 17 in 1993/94 and Sept 20, Oct 20, Nov 17, and Dec 14 in 1994/95 at Londrina, PR, Brazil. Procedures of regression analysis and minimum variance among planting date means were efficient for selecting stable lines during the four sowing seasons. It was possible to select stable and high yielding genotypes through the four sowing periods in all the crosses. No specific cross was clearly better to produce a greater number of stable genotypes.Index terms: Glycine max, cultivars, genotypes, progeny, photoperiodicity, temperature, yields, productivity. ESTABILIDADE DE PRODUÇÃO DA SOJA EM DIFERENTES ÉPOCAS DE SEMEADURARESUMO -A produtividade da soja é muito influenciada pela época de semeadura, ocorrendo perdas significativas na produtividade quando as semeaduras são realizadas fora de um período relativamente restrito em muitas regiões do Brasil. A criação de cultivares menos sensíveis à variação do fotoperíodo e da temperatura, além de possibilitar a ampliação do período de semeadura, permite o cultivo dessas cultivares numa faixa mais ampla de latitude e a viabilização do cultivo de soja irrigada, durante o outono-inverno, em regiões isentas de geadas. Para estudar a possibilidade de selecionar linhagens produtivas e estáveis às épocas de semeadura, 100 linhagens (F 9 e F 10 ) não-selecionadas, derivadas de cada um dos possíveis cruzamentos entre os genótipos BR85-29009, OCEPAR-8, FT-2 e BR-13, foram semeadas em experimentos irrigados instalados segundo esquema em covas, sob um delineamento inteiramente casualizado. As datas de semeadura no campo foram 27/09, 20/10, 17/11 e 17/12, em 1993/94 e 20/09, 20/10 17/11 e 14/12, em 1994/95, em Londrina, PR. Métodos de análise de regressão e de variância mínima entre médias de épocas de semeadura foram eficientes para selecionar linhagens estáveis às épocas de semeadura. Foi possível selecionar genótipos estáveis às quatro épocas de semeadura, em todos os cruzamentos, e não foi observada superioridade de um cruzamento específico.

Selection of Useful Germplasm Based on the Variation Analysis of Growth and Seed Quality of Soybean Germplasms Grown at Two Different Latitudes

“…During the growth duration of the soybeans at two different latitudes, Suwon and Yeoncheon, the accumulated temperature and sunshine duration in 2015 increased relative to those in the normal years whereas the precipitation in 2015 severely declined rather than that of normal years. However, our results were similar to previous results that the soybeans grown at low latitude are earlier in flowering and maturing periods and are lower in biomass and yield than that at high latitude (Lima et al 2000), that drought-stress affect to decrease in seed yield and yield components (Frederick et al 2001), and that the increase of sunshine duration results in the increase of soybean yield (Kumar et al 2008). For these results, although we assumed that weather conditions are likely to affect the agronomic characteristics and chemical compositions but could not indicate a critical major environmental factor on regional variation of yield and growth because numerous weather conditions, especially precipitation and sunshine duration, were complicatedly different depending on cultivation years and regions.…”

Identification of mega‐environments in Europe and effect of allelic variation at maturity E loci on adaptation of European soybean

“…Dependent on the photoperiod sensitivity of the cultivars, they matured later or even failed in reaching full maturity at the northern locations with their longer day lengths. Similar results were reported by Lima et al (2000), where cultivars when grown at a lower latitude flowered and matured earlier. Nevertheless, there are some locations where the genotypes responded differently than expected from the locations' latitude.…”

“…Similar results were reported by Lima et al . (), where cultivars when grown at a lower latitude flowered and matured earlier. Nevertheless, there are some locations where the genotypes responded differently than expected from the locations' latitude.…”

Agronomic performance and stability of seed, protein and oil yields of seven soybean cultivars determined in field experiments in Slovenia

“…Numerous authors use different yieldstability statistics to evaluate performance of tested genotypes (YAN and RAJCAN, 2003), e.g. GGE biplot (ZHANG et al, 2005;MATEI et al, 2018), Wricke's ecovalence (SILVA et al, 2016), regression (b), determination (R 2 ) and deviation of the linear regression (σ 2 ) coefficients (LIMA et al, 2000), regression coefficient (b) (YAN et al, 2010), coefficients of variation (CV) (POPOVIĆ et al, 2012), amongst others. Interestingly, however, all stability indices are relative to each study and determine the best genotype among tested cultivars.…”