Desempenho agronômico de cultivares de soja em terras baixas

Abstract

The objective of this study was to evaluate the agronomic performance of 20 soybean cultivars in lowland by agronomic character measurement. The experiment was carried out in the agricultural year 201’7/2018, in the experimental area of Federal University of Pampa – Itaqui/RS, located at latitude 29º09'21 ''S, longitude of 56º33'02''W and altitude of 74 m. The experimental design was a randomized block design, with three replications, and 20 soybean cultivars as treatments. The experimental units (plots) were composed of 5 rows spaced at 0.45 m, with 3.0 m length. Were evaluated the variables as follows: plants per meter (PPM, units); plant mass (PM, g); plant height (PH, cm); first pod insertion height (FPIH, cm); number of branches (NB, units); number of nodes (NN, units); number of pods (NP, units); pods mass (PM, g), number of grains (NG, units) and grain yield per plant (YG, g.plant-¹). Statistical differences among cultivars were detected for evaluated variables, except for the variable NN. Besides clustering of means by Scott-Knott test at 5% of probability, were also calculated the coefficients correlation (genotypic and phenotypic) and experimental precision statistics. The cultivars "68I70 RSF IPRO - Ícone", "71 66 RSF IPRO - Ponta" and "6563 RSF IPRO", presented better performance, yielding 30.66, 25.82 and 20.78 g.plant-1 respectively, showing as potential genotypes for lowland production and for use in breeding programs.