Desempenho de duas cultivares de soja em função da população de plantas na região norte do Paraná

Abstract

The aim of this work was to evaluate the performance of the cultivars TMG 4001 and NK 7074 regarding plant populations. The work was carried out TMG Experimental Plant, in Cambé, Paraná. The effects of the different plant populations were evaluated by the following production factors: productivity, number of grains per pods, number of grains per plant, weight of 1000 grains, lodging, plants height and of first pods insertion height. It was used randomized complete blocks design for the treatments and parcels subdivided, in the factorial 2x5 with six replicates. The two cultivars studied were planted in five populations (220, 300, 415, 520 e 640 thousand plants ha-1). The data were submitted for variance analysis, regression and linear correlation. With the results it was possible to conclude: 1 – In TMG 4001 there was quadratic interaction for productivity with ideal populations of 400 a 420 thousand plants per hectare, where the productivity was 3.662,11 kg.ha-1; In NK 7074 the linear interaction was 200 thousand plants per hectare the best population with productivity of 3.288,32 kg.ha-1; 2- With the Pearson correlation test, it was possible to infer that the cultivars showed the following interations: positive relation to lodging regarding high population and plants height. Negative relation to the number pods per plant and the grains per plant, and its effects are dependent on the higher or lower population of plants per area. The height of first pods insertion and weight of 1000 grains are not influenced by the variation of the plant populations, even by the possible physiologic interaction due to this.