Bioavailability of diuron,imazapic and isoxaflutole in soils of contrasting textures |
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Authors: | Miriam H Inoue Rubem S Oliveira Jr Jamil Constantin Diego G Alonso Cássio A Tormena |
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Institution: | 1. Department of Agronomy , State University of Mato Grosso , Tangará da Serra, Brazil;2. Department of Agronomy , State University of Maringá , Maringá, Brazil |
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Abstract: | This research was aimed at understanding the dynamics of the herbicides diuron 3-(3,4-dichlorophenyl)-1,1-dimethylurea], imazapic 2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-5-methylnicotinic acid] and isoxaflutole 5-cyclopropyl-4-(2-methanesulfonyl-4-trifluoromethyl benzoyl)isoxazole] in two soils of different physico-chemical properties. To accomplish such intent, several greenhouse experiments were run. The bioavailability of diuron (0; 1.6 and 3.2 kg ha? 1), imazapic (0; 98 and 122.5 g ha? 1) and isoxaflutole (0; 35 and 70 g ha? 1) was measured in samples from a sandy loam soil and a clay soil, by sowing a bioindicator (Brachiaria decumbens), at 0, 25, 50, 75 and 100 days after herbicides application (DAA). Diuron was very stable in clay soil, providing control equal to or higher than 92% of bioindicator, up to 100 DAA, as assumed by biomass accumulation. No differential effect was observed in sandy loam soil, even when 2x labeled rate were applied. Imazapic provided a short bioavailability in relation to B. decumbens, independent of rates applied. The persistence of isoxaflutole was longer in clay soil (28 to 30 days). |
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Keywords: | Herbicides persistence retention |
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