Revista Brasileira De Herbicidas 2000; 1(2): 119-122

ISSUE Cover

Selectivity ofherbicides diclosulam, flumetsulam, and cloransulam in several soybean cultivars

DOI: 10.7824/rbh.v1i2.324

Selectivity is the capacity ofherbicides to control weeds in a crop without reducing the productivity and quality ofthe final product. It cannot be determined only by the verification of presence or not oftoxicity symptoms, because there are already well-known herbicides that can reduce the productivity of crops without producing visual effects and also herbicides that provoke quite accentuated toxicity, but that allow the crop to manifest its productive potentials fully. This work has the objective to evaluate the selectivity of diclosulam, flumetsulam and cloransulam in soybean BR-16, BR-911241 O, Embrapa 64 (Ponta Porã), BR-37, BR-9113306, Lambari, Cambará, Embrapa-61, Conquista and Embrapa 65 (ltapoty) cultivars. The experiment was carried out in the experimental area of Embrapa Agropecuária Oeste, in Dourados, MS, during 1998/99. The experimental design was a split plot, with four replications. The main plots were the herbicides and the subplots were the cultivars. Plant height, number of plants by meter and grain production were evaluated. Diclosulam at 35 g/ha and mixtures of diclosulam+flumetsulam at the rates of20+94 g/ha, cloransulam+lactofen at 40+ 120 g/ha and cloransulam+imazethapyr at 30+50 g/ha did not affect the height and 1998/99. A semeadura e aplicação dos tratamentos em préemergência ocorreram em 12.12.98. Os tratamentos em pósemergência foram realizados em 05/01/99. As cultivares de soja utilizadas foram BR-16, BR- 911241O,Embrapa64(pontaPorã), BR-37, BR-91 13306,Lambari, Cambará, Embrapa-6I, Conquista e Embrapa 65 (Itapoty). Foram realizadas as práticas culturais recomendadas para a região de acordo com Embrapa (1996). O solo da área experimental apresentava as seguintes características de fertilidade e textura: number ofplants by linear meter and the production ofgrains, showing to be highly selectives to soyben BR-I6, BR-9II2410, Embrapa 64 (ponta Porã), BR-37, BR-9113306, Lambari, Cambará, Embrapa-61, Conquista and Embrapa 65 (ltapoty) cultivars.