Abstract
The aim of this study was to compare the agronomic performance of RR soybean genotypes with conventional soybean genotypes derived from two-way crosses and evaluate through path analysis the influence of important traits for culture on the grain yield (GY) in the Northwestern of Sao Paulo, Brazil. It was used the randomized block design with three replications. Among the analyzed RR genotypes, three genotypes has high GY, with average values over 4575.5 kg ha-1, while among the conventional, ten genotypes, and the check Conquista showed superiority for GY, with average values over 3511.4 Kg ha-1. In general, the most productive RR soybean genotypes showed higher values when compared with conventional genotypes with higher yield. However, conventional soybean showed a higher number of superior genotypes with similar behavior when compared to the RR soybean. For the group of RR soybean genotypes, all agronomic traits, except one hundred seed weight (HSW), correlated positively with GY. For the group of conventional soybean genotypes, there was no significant correlation between GY and all agronomic traits analyzed. The genotypic correlation and path analysis indicate the plant height at flowering (PHF) and plant height at maturity (PHM) as the most favorable and direct effect on GY. Key words: Glycine max, breeding, genetic correlations, productive performance, direct effect, RR soybeans.
Highlights
Soybean (Glycine max (L.) Merrill] is considered one of the most important crops in Brazil due to be the most widely grown in different regions, moving significantly the economy and generating jobs and rents
The aim of this study was to compare the agronomic performance of Roundup Ready (RR) soybean genotypes with conventional soybean genotypes derived from two-way crosses and evaluate through path analysis the influence of important traits for culture on the grain yield (GY) in the Northwestern of São Paulo, Brazil
For the group of conventional soybean genotypes, there was no significant correlation between GY and all agronomic traits analyzed
Summary
Soybean (Glycine max (L.) Merrill] is considered one of the most important crops in Brazil due to be the most widely grown in different regions, moving significantly the economy and generating jobs and rents. In São Paulo state,in the crop year 2015/2016, the area cultivated with soybean was 857,600 hectares, with an average productivity of grains of 3316 kg ha-1 and production of 2.84 millions of tons of grains (Conab, 2016). It is noteworthy that the high level of soybean production has great contribution of breeding with the development of transgenic cultivars. According to Lima et al (2008) and Matsuo et al (2009), the adoption of RR cultivars is based on the ease of management of areas infested with weeds, allowing the efficient check of weeds in post-emergence stage
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