Adsorption-desorption and leaching potential of glyphosate and aminomethylphosphonic acid in acidic Malaysian soil amended with cow dung and rice husk ash |
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| Authors: | Jamilu Garba Abd Wahid Samsuri Radziah Othman Muhammad Saiful Ahmad Hamdani |
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| Affiliation: | 1.Department of Agricultural Education,Zamfara State College of Education,Maru,Nigeria;2.Department of Land Management, Faculty of Agriculture,Universiti Putra Malaysia,Serdang,Malaysia;3.Department of Crop Science, Faculty of Agriculture,Universiti Putra Malaysia,Serdang,Malaysia |
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| Abstract: | This study investigates adsorption-desorption and the leaching potential of glyphosate and aminomethylphosphonic acid (AMPA) in control and amended—addition of cow dung or rice husk ash—acidic Malaysian soil with high oxide mineral content. The addition of cow dung or rice husk ash increased the adsorptive removal of AMPA. The isotherm data of glyphosate and AMPA best fitted the Freundlich model. The constant Kf for glyphosate was high in the control soil (544.873 mg g?1) followed by soil with cow dung (482.451 mg g?1) then soil with rice husk ash (418.539 mg g?1). However, for AMPA, soil with cow dung was high (166.636 mg g?1) followed by soil with rice husk ash (137.570 mg g?1) then the control soil (48.446 mg g?1). The 1/n values for both glyphosate and AMPA adsorptions were
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