ÉPOCAS DE SEMEADURA NO DESEMPENHO AGRONÔMICO DE CULTIVARES DE SOJA EM RIO VERDE, GO

Abstract

National and international research has shown that the soybean sowing time can influence different components of crop production. Therefore, the objective of this study was to evaluate the influence of the sowing time on the agronomic performance of soybean cultivars in the municipality of Rio Verde, GO. The experiment included 59 commercial soybean cultivars, sown in two seasons of the 2017/18 crop, the first on October 17 (RVI) and the second on November 2 (RVII). The experimental design used was a randomized block with three replications in a factorial scheme. The plots consisted of 4 lines 4 meters long, spaced 0.50 m between lines and with a final plant population of 300,000 plants per hectare. The agronomic characteristics evaluated were: grain yield (PROD), mass of one hundred grains (MCG), number of pods per plant (NVP) and plant height (ALT). The data were submitted to analysis of variance for each environment and, verifying homogeneity. For the comparison between the means of each treatment, the Scott and Knott means cluster test at 5% significance was used. Significant variations for the average of PROD were observed, where the sowing RV I, results in a higher productivity, providing an increase of 11.88% over RVII, with emphasis on cultivating HK 8415IPRO which obtained the highest average, with 5847.29 kgha- 1. Among 59 cultivars evaluated, 18 showed significant variations for the PROD variable between environments. A great variation for the NVP characteristic was observed between the environments, where RVII presented the best conditions, with an average of 70.45. A difference of 15 days between plantings was not enough to express a difference in the average for plant height.

Keywords: Glycine max (L.) Merril, Genotype x environment interaction, Productivity.