COMPORTAMENTO FENOLÓGICO, NUTRICIONAL E DE PRODUTIVIDADE DE CULTIVARES DE SOJA NO SUDESTE PARAENSE

Abstract

Evaluate the potential of different soybean cultivars in complex conditions such as in the Amazon region is necessary to investigate the adaptability and behavior in various aspects of these cultivars. In this sense, the objective was to evaluate the phenological, nutritional and productivity behavior of soybean cultivars under edaphoclimatic conditions in Pará southeast. For this, nine cultivars were tested: BRS 279RR, BRS 333RR, BRS 325RR, BRS 9090RR, BRS 8990RR, BRS SambaíbaRR, P98R31, P98Y51 and P98Y70. The experimental design was in randomized blocks, with density of 240.000 plants.ha^-1, with four replications. Plant height and first pod insertion (cm), flowering and maturation (days) and grain yield (kg ha^-1) were evaluated. In addition, was quantified N, P and K leaf contents. For plant height, the cultivars BRS 9090RR, BRS 333RR and P98Y70 stood out, with heights of 73.25; 72.25 and 71 cm, respectively. The insertion of the first pod ranged from 8.75 (P98Y51) to 16.75 cm (BRS 333 RR). Flowering was reached between 34 (P98R31) and 42 (BRS 333RR and P98Y70) days after emergence. The maturation period started at a minimum of 98 days (P98R31) and a maximum of 119 days (BRS 333RR) after emergence. The highest yields were registered for BRS’s and P98Y70, varying between 1890 and 3192 kg.ha^-1. The N, P, K leaf contents did not differ between the cultivars tested. The BRS 333RR, showed excellent performance of agronomic characteristics.