Percentage of Soybean Lipids in Different Crops, Densities, and Positions in the Plant in Southern Pará

Abstract

The lipid content in soybean grain can be influenced by environmental characteristics, pod positioning, and plant population. However, the objective is to evaluate the percentage of soybean lipids in different plant positions in populations of two crops, in the southern region of the state of Pará. In this sense, two tests were carried out, one in the agricultural year 2018/19 and the other in 2020/21, in Conceição of the Araguaia-PA. The experimental design used in each assay was randomized blocks with three replications. The treatments were arranged in plots sub-sub-sub-Subdivided, being allocated in the plots six cultivars, in the subplots three sowing densities (10; 14; 18 seeds m-1) and the sub-sub-two plots sites in the plant (on top and in the bottom third). The characteristic studied was the percentage of lipids. Individual variance analysis was performed and, later, joint analysis of the assays was performed. The highest averages of lipid contents were obtained in the lower third of the plant, with emphasis on the cultivars Ultra 75i77 IPRO, in the density of 18 seeds m-1 (24.3% crop 1 and 24.1% in the crop 2). The densities influenced the results, showing significant differences between them and being the best density of (18 seeds m-1). When the grains were collected in the lower third of the plant, they showed the highest lipid contents. Crop 1 was affected by the high temperature followed by a water deficit in the grain filling phase, showing that in November in southern Pará you can get summer in the R5.1.