Desempenho agronômico de cultivares de soja sob diferentes arranjos de plantas

Abstract

The arrangement may alter the growth of soybean plants, their response to the incidence of biotic and abiotic stresses, the quality of sprays, lodging, and, especially, grain yield. The objective of this work was to evaluate the agronomic performance of two soybean cultivars, sown in different populations and spacing between lines. The cultivars used were NS 6909 IPRO® and NS 4823 RR®, submitted to different populations, 200, 300 and 400 thousand ha-1 plants, and line spacing of 0.20; 0.30; 0.40; 0.45 and 0.50 meters. The experiment was conducted in the agricultural year of 16/17, next to the Experimental Station of Annual Cultures, UTFPR, Campus Dois Vizinhos. The analyzed variables were: petiole length of the lower, middle and upper thirds, plant height, height of insertion of the first pod, number of pods per plant, number of grains per pod, number of grains per plant, mass of a thousand grains and productivity. The experimental design was a randomized block design, with three replications. The data were submitted to analysis of variance and, if there was any significance, the qualitative factors were compared by Scott Knott, 5% probability, and the quantitative factor by regression. The cultivar NS 6909 IPRO obtained the best results in the arrangement 0.20 m x 300 thousand plants. The NS 4823 RR presented better results in the arrangement of 0.30 m x 400 thousand plants. The cultivars responded differently to the arrangements tested, however, in general, the reduced spacings were higher than the traditional soybean spacings of 0.45 -0.50 m.