Falhas na semeadura de soja: impactos sobre parâmetros morfológicos e no rendimento final de grãos

Abstract

Variable soybean seed distribution in rows can reduce the final stand and compromise grain yield. This paper evaluates the impact of seed distribution on some plants’ morphological characteristics and final soybean yield. The study was conducted at the experimental area of the Federal University of Santa Maria, Frederico Westphalen Campus, in Rio Grande do Sul State, under a completely randomized block design consisting of five treatments and four repetitions. The size of the plant spacing in the row made up the variation factor, and spaces of 0 (no space); 7.7; 15.4; 30.8 and 61.4 cm were evaluated. The parameters evaluated were plant height; main stem diameter; number of lateral branches; fruit per plant; insertion height of the first legume; number of viable nodes on the main stem; number of viable nodes on the lateral branches, and final grain yield (kg ha-1). Plant spacing in rows increases the number of lateral branches, the number of nodes in lateral branches and the fruit per plant, and spacing up to 61.6 cm does not compromise the final soybean yield.