Weed control in irrigated rice as a function of pre-emergence herbicide rates and irrigation start

摘要

The objective of this work was to evaluate the behavior of two herbicides, penoxsulam and clomazone, as a function of rates and times of flooding on weed control and grain yield in rice. The trial was conducted in split-split plots and completely randomized block design, with irrigation start (19, 24 and 29 days after emergence), and two herbicides, penoxsulam (18, 36, 54 and 72 g ha-1) and clomazone (300, 400, 500 and 600 g ha-1) applied in pre-emergence of weeds and rice crop. Penoxsulam, between 18 and 72 g ha-1, and clomazone, between 400 and 600 g ha-1, applied in pre-emergence in rice crop, allowed irrigation start 29 days after emergence (DAE), without reductions in weed control or grain yield.