The dissipation of hexazinone in tropical soils under semi-controlled field conditions in Kenya |
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| Authors: | Joseph O Lalah Bonface M Muendo Zachary M Getenga |
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| Institution: | 1. Department of Chemistry , Maseno University , Maseno, Kenya;2. Department of Chemistry, Faculty of Science and Engineering , Masinde Muliro University of Science and Technology , Kakamega, Kenya |
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| Abstract: | The dissipation of hexazinone (Velpar) in two tropical soil types in Kenya was studied under field and semi-controlled conditions for a period of 84 days. The dissipation was found to be very rapid and this could be attributed to adverse weather conditions including high initial rainfall as well as to low soil-organic-matter content, volatilization, surface run-off and biodegradation. The DT50 values of dissipation obtained by first order kinetics were 20 days and 21.3 days in clay and loam soil types, respectively. The influence of bargasse compost (1000 μg/g dry soil) was also studied and was found to enhance dissipation to some extent, giving DT50 values of 18 days and 18.3 days in clay and loam soil types, respectively. |
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| Keywords: | Hexazinone field dissipation half-life tropical soil |
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