Comportamento da soja BRS 7780 IPRO (Glycine max L. MERRIL) no município de Serra Talhada - PE em diferentes densidades de semeadura

Abstract

Soy, being a very important oilseed for the production of oils and bran, becomes an alternative for the composition of human and animal food, since it has gained great expressiveness in Brazil over the years. Due to the scarcity of studies on soybeans in some Northeastern states and the adequate production arrangements for the crop, it is of great importance to develop research on seeding density, a determining factor in the production environment influencing the growth and development of soybeans, with the objective of evaluating the behavior of the BRS 7780 IPRO soybean variety in different plant densities (333, 416 and 476 thousand plants ha1), in semi-arid conditions, in the municipality of Serra Talhada. The study was developed in the period from March to June 2019, at the Universidade Federal Rural de Pernambuco, Unidade Acadêmica de Serra Talhada. The experimental design used was that of randomized blocks, with three treatments representing planting densities of 333 thousand, 416 thousand and 476 thousand ha-1 plants, with eight repetitions. Plant height and first pod insertion, number of pods and grains per plant, number of branches, wet and dry weight of pods, mass of 1000 grains and estimated grain productivity were evaluated. It was concluded that the height of the plants and the insertion of the first pod are higher with the increase of the seeding density, however, it promoted a greater reduction in the number of branches per plant, number of pods and grains per plant. For the cultivar studied, sowing density extremes did not promote considerable variations in productivity and the weight of 1000 grains. The BRS 7780 IPRO soybean cultivar presented a first pod insertion height close to that adequate for mechanized harvesting