Row spacing, plant density and intrarow plant spacing uniformity effect on soybean yield and agronomic characteristics

Abstract

The objective of the present study was to evaluate the row spacing (45 and 60 cm), plant populational density (10, 13, 16, 19 and 22 plants m^-1) and intrarow plant spacing uniformity (acceptable spacing 25%, 35%, 60% and 100%) effects on soybean yield. The experiment was carried out in the years 1997/1998 and 1998/1999, using the CAC-1 cultivar. The experimental design was a split-split plot, with three replications. There was increase in the soybean yield in the 45 cm-row spacing when plant density was reduced to 10 plants m^-1, and with uniformity above 60%. The plants height and lodging were significantly reduced; however, survival was increased as reduction of the density happened. It was also detected that the increase of the spacing uniformity reduced their lodging.