University of Khartoum

The Adsorption and Desorption Of Diuron and Fluometuron by Soils

The Adsorption and Desorption Of Diuron and Fluometuron by Soils

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Title: The Adsorption and Desorption Of Diuron and Fluometuron by Soils
Author: Mustafa, M.A; etal
Abstract: The adsorption and desorption of diuron and fluometuron by the Gezira clay, Kinana clay, and Gerif loamy clay soils were studied. The two herbicides exhibited greater adsorption by the Gerif soil than by the Kinana and Gezira soils. The Kinana soil adsorbed more fluometuron than the Gezira soil. However, only at low and high concentrations of diuron did the Kinana soil show greater adsorption than the Gezira soil. At intermediate range of diuron concentrations the opposite occurred. Since the Gezira soil contained the lowest percentage of organic matter it was argued that organic matter did not play any significant role in the adsorption of these two herbicides by these soils. The Gerif soil has the highest specific surface area than the twos ils. It was thus concluded that in arid-zone soils, very low in organic matter, specific surface area may be a good criterion for determining adsorption. Diuron exhibited greater adsorption on the three soils than fluometuron. Desorption was studied by an extraction method and a leaching one. Fluometuron is retained more by the Gerif soil than by the other two soils. Diuron persisted in both the Gezira and Gerif soils but was readily desorbed from the Kinana soils.
URI: http://khartoumspace.uofk.edu/123456789/22283


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