Revista Brasileira De Herbicidas 2017; 16(3): 183-191
Control in soybean pre plant of volunteer glyphosate and ammonium glufosinate tolerant cotton and Eleusine indica
The objective of the research was to determine the efficacy of pre-emergence-applied herbicides sprayed at different rates and times before soybean planting under water deficit conditions, to control volunteer cotton plants tolerant to glyphosate and ammonium glufosinate and Eleusine indica. The trial was conducted on Formosa do Rio Preto/BA, during the 2015/16 growing season, in a randomized complete block design, with four replications and ten treatments, which included: glyphosate + diclosulam 960 + 25,2 g ha-1 a.i., glyphosate + diclosulam 960 + 35 g ha-1 a.i. sprayed 50, 20 and 0 days before soybean planting (DBP), glyphosate + flumioxazin 960 + 50 g ha-1 a.i., glyphosate + sulfentrazone 960 + 150 g ha-1 a.i., glyphosate + sulfentrazone 960 + 200 g ha-1 a.i. sprayed 0 DBP and an untreated treatment. Assessments of percentage visual control were performed 7 and 0 DBP and 14 and 45 days after soybean planting (DAP) and soybean grain yield was measured. Diclosulam at 25,2 and 35 g ha-1 a.i. controlled volunteer cotton plants when sprayed 50, 20 and 0 DBP. Sulfentrazone sprayed 0 DBP at 150 and 200 g ha-1 a.i. controlled volunteer cotton while flumioxazin did not provide adequate control. Diclosulam at 25,2 to 35 g ha-1 a.i. was the best treatment to control Eleusine indica when sprayed 0 DBP. Soybean yield was considered equal between treatments.
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