Características agronômicas com diferentes condições de cultivo de soja no sul do Pará

Every day, research focuses on increasing the productivity of soybeans and for the southern region of Pará it needs agronomic evaluations. The objective is to evaluate the agronomic characteristics of soybean kg/ha-1, at three densities (10; 14; 18 seeds/m) in 2 different planting seasons, in the southern region of the state of Pará. In this sense, two trials were carried out, being the harvests (2018/19 and 2020/21) in Conceição do Araguaia -PA. The design was randomized blocks (DBC) in sub-subdivided plots with three replications. The treatments consisted of two planting times, in the main plots, six soybean cultivars, in the sub-subplots, three sowing densities (10; 14; 18 seeds/m). Individual analysis of variance and, later, joint analysis of the tests was performed. The characteristics studied were: Height of plants (AP); Number of pods per plant (NVP); 1000 seeds weight (PMS); Grain yield (PROD). Plant height ranged from 42.6 to 65 cm, and the cultivar Ultra 75i77 IPRO had the lowest and highest average at the same density in different crops. In seasons 1 and 2 they had NVP with an overall average higher of 32.5 at the density of 10 seeds/m, with emphasis on cultivar Desafio that had 36.3 NVP in season 1. In PMS, cultivar Desafio obtained both in the highest density in the two highest seasons (236.6 g) and the smallest weight (146.3 g). This differential data can only be explained by the environmental factor. The highest yields occurred in crop 1, with a difference between crop of almost 30%.