Diclosulam effects on soybean grown in soils of different textural classes

Abstract

The use of herbicides in pre-emergence of the soybean crop is a great tool for weed management. However, it is important to know the effects of herbicides in order to avoid a decrease in productivity. The objective of this study was to evaluate the sensitivity of three soybean cultivars submitted to pre-emergence application of diclosulam in clayey soils and average. The experiments were conducted in a greenhouse in randomized complete block design with four replications in a 6x2 factorial, where factor A corresponded to the treatments and the B factor was the soil textures. The treatments were different herbicide spraying times diclosulam, all pre emergency, being: without application, 28, 21, 14, 7 and 0 days before sowing (DAS) soybeans. The cultivars M IPRO 6410 NS 6906 NS 7000 and IPRO IPRO. Sowing took place at the end of the spray treatments at day 0 DAS. We evaluated the emergence speed index (EVI), percentage of phytotoxicity, plant height, dry weight of shoot and dry root weight. According to the methodologies used in this experiment, the herbicide diclosulam applied in pre emergence in clayey soils and average is safe for soybean cultivars analyzed, it did not cause negative effects on plant development.