PRODUTIVIDADE DE CULTIVARES DE SOJA EM FUNÇÃO DA VARIAÇÃO DA DENSIDADE DE PLANTAS

Abstract

The suitable plant population for soybean implantation can be used to maximize its grain yield potential. In this sense, the objective of this work was to evaluate the performance of two soybean cultivars, with different characteristics of grazing, in function of the plant population variation in two production environments. The trials were conducted at Fazenda Vitória (Environment 1) in the municipality of Rio Verde and Bayer Research Station (Environment 2) in the municipality of Santa Helena de Goiás, in the 2017/2018 harvest. The experimental design was randomized blocks, in a 2x4 factorial scheme, with five replications. Two soybean cultivars (M7110IPRO and M7739IPRO) and five populations (populations ranged from 16.66% to 33.33% as recommended by the breeder) were tested. Each plot consisted of four rows of six meters in length, spaced 0.5 m between rows. The evaluated agronomic characteristics were: plant height, number of pods per plant and per meter, grain yield and weight of one thousand grains. Thus, it can be concluded that in both clayey and highly clayey soil conditions, the plants density yielding the highest productivity of the cultivar M7110IPRO was at 19 plants per metro-1. The productive potential of the cultivar M7739IPRO is higher in the condition of greater fertility (Environment 2), being the density of 13 plants per metro-1 the most recommended. It was evident at the end that the recommendation to producers about the use of seeds should be improved from a standardized final stand recommendation to a population according to the existing production environment in each area