Revista Brasileira De Herbicidas 2000; 1(3): 249-254
Efficacy and selectivity of tank mixtures of preemergence herbicides in no-till soybean.
DOI: 10.7824/rbh.v1i3.342
A trial was carried out on Bela Vista Farm, Serranópolis (GO), to evaluate the efficiency and selectiveness ofherbicide combinations applied in preemergence for soybean cv. Rainha. The treatments used were: metalochlor+diclosulam (2400+35 g/ha), sulfentrazone+diclosulam (250+25, 300+20, 350+ 15 and 200+35 g/ha), clomazone+diclosulam (504+25, 720+25, 828+25, 504+30, 720+30 and 828+30 g/ha), as well as an untreated control. It was concluded that the herbicide mixtures were selective for soybean cv. Rainha. Sulfentrazone+diclosulam and clomazone+diclosulam, independently ofthe dose used showed an efficient control of capim-carrapicho (Cenchrus echinatus), picão-preto (Bidens pilosa), trapoeraba (Commelina benghalensis), leiteiro (Euphorbia heterophylla) and guanxuma (Sida rhombifolia), close to that ofmetolachlor+diclosulam (2400+35 glha). The lowest bean yield was obtained with the untreated control. Significant differences betwen the chemical treatments for productivity were not observed but the lowest bean yield was obtained with the untreated control. The dry weight of weeds in the untreated control was superior to that obtained with chemical treatments.
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