Use efficiency of water and radiation in soybean under competition with Alepo sorgo.

Abstract

The objective of this study was to evaluate the use efficiency of water and radiation (WUE and RUE) of two soybeans cultivars growing under different plant densities, row spacing and competition with glyphosate resistant Aleppo sorghum. In general, the presence of weeds reduced total dry matter, yield, WUE and RUE. The increase in density and the decrease in row spacing improved WUE and RUE and increased total dry matter and yield. Soybean cultivar with the highest maturity group accumulated more dry matter than that with the lowest maturity group. However, both cultivars showed similar yields and RUE.