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• W985707573 abstract "Norflurazon is a seJective herbicide etfective against many a111ma] broad-Ieaved weeds. lis retention in soil, is related to the organic matter, being slIbject lo considemble leaching in sandy soils with low organic mattcr conten!' Application of organic wastes to soils can be a good method to reduce pesticide losses due to leaching processes, and also has been generally accepted as a disposal practice that reeycles beneficial plant nutricnts, However, a wide diversity of organic wastes can be applied on soils of very different eharacteristics, and the behaviour of these systems with respect to pesticides adsorption can be also very different. For this reason, the aim of this study was to asses the inftllence of three organic waste amendments on 1I0rftllfaZOn adsorption-desorption processes in several soils with very diiIerent properties, as a first step lO evaluate the potentialleaching of this pesticide thl'ough organic fertilised soils. Three organic amendments were used: a commercial product manufactured 1'rom olive mil! wastewater and other plant residues, an urban wastc compost, and wastcs from papel' industry, Thc organic carbon amendment of ihe soils was carried out by mixing thoroughly, dllring 24 hours, 300 g of the original soiJ with 20 g of the three amendments. The amended soils were lIsed immediately after preparation and also after during two Illonths at 37C, adding water periodically, Quadrllplicate ndsorption experiments were done by mixing lO g of the native and amendcd soils with 20 mL of 0.01 M Ca(NO,), Sollllions, containing vafIolls concentrations (4,8, 12, 16,20 mg L,I) of norflurazon. After ~tiaking for 24 h at 20 ± 1°C, the sllspensions were centrifuged and the concenlralIon of norfturazon in the supernatant was determined. Desorption experiments were performed after adsorption equilibriul11 was reached, by removing half ofthe supernatant atler centrifugation, replacing il by LO mL 01'0.01 M Ca(NOJ, solution, al!owing equilibration for an additional 24-11 period, and after thal operating as in tl;e adsorption experiment. This process was repeated twice more. As a eonsequence of the basic pH of the residues, the soil pH was highcr after the addition of Ihe waste fhtilisers. The OM content ofthe soils also increased afler fertilisation, but decreases a littlc aftcr agcing. Norfturazon adsorption inereases in some of the fertilised soils, speeial!y in those soils with a very low OM content, bUI decreases in those Boil s that adsorbed a high amount of pesticide before fertiliser addition. The effeet of lhe difIerent waste fel1ilisers added on norfturazoll adsorption depends on the properties of the soH in which it is applied. Norfturazon desorption inereases in al! cases in fertiliscd soil, in comparison to pcsticide desorption from native soils, even in those fertilised soils in which lhe pesticide adsorption was very high. The waSle fertiliser Ihat gave a higher norflurazon desorption was the urban wasle compost." @default.
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• W985707573 date "2001-01-01" @default.
• W985707573 modified "2023-09-27" @default.
• W985707573 title "Effect of three organic wastes on the adsorption behaviour of norflurazon in soils" @default.
• W985707573 hasPublicationYear "2001" @default.
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