Revista Brasileira De Herbicidas 2005; 4(2): 1-9
Effect of soil moisture status on carfentrazone-ethyl selectivity and weed control on soybeans
DOI: 10.7824/rbh.v4i2.31
The effects of soil water and, by inference, the plant water status prior to herbicide treatment, on the response of soybean and Euphorbia heterophylla L. to carfentrazoneethyl applied alone and in mixture with imazethapyr were studied under field conditions. The study was conducted during the 2001/2002 growing season. The experimental design was a split block in strips with four replications. The strips consisted of irrigation (irrigation and no-irrigation) and herbicide. The irrigation consisted of an event of 30 mm of water 2 which was carried-out in the day prior to herbicide application using sprinklers. The herbicides were carfentrazone-ethyl 10,0 g a. i. ha-1, carfentrazone-ethyl 10,0 g a . i./ha + imazethapyr 24,5 g a. i./ha. A check and a hoed treatment were included. High moisture status plants (irrigated) were more sensitive to carfentrazone-ethyl applied alone and in mixture with imazethapyr than unirrigated plants. The best E. heterophylla control was given by carfentrazone-ethyl 10,0 g a . i./ha1 + imazethapyr 24,5 g a. i./ha. Soybean plants recovered from the initial phytotoxicity caused by carfentrazone-ethyl treatments and there was neither effect on the final plant height or biomass and grain yield.
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