clay and hexazinone

clay has been researched along with hexazinone* in 2 studies

Other Studies

2 other study(ies) available for clay and hexazinone

Article	Year
The dissipation of hexazinone in tropical soils under semi-controlled field conditions in Kenya. Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes, 2009, Volume: 44, Issue:7 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 DT(50) 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 microg/g dry soil) was also studied and was found to enhance dissipation to some extent, giving DT(50) values of 18 days and 18.3 days in clay and loam soil types, respectively. Topics: Aluminum Silicates; Biodegradation, Environmental; Clay; Herbicides; Kenya; Soil; Triazines; Volatilization	2009
Inorganic and organic clays as carriers for controlled release of the herbicide hexazinone. Journal of agricultural and food chemistry, 2002, Apr-10, Volume: 50, Issue:8 The risk of ground water contamination resulting from rapid leaching of highly soluble pesticides can be minimized through the application of the pesticide adsorbed on a matrix or carrier, which limits the amount of pesticide immediately available for undesirable losses. The use of natural materials for this purpose is of special interest in terms of economy and sustainability. In this work the adsorption of the herbicide hexazinone by two montmorillonites saturated with various inorganic and organic cations was determined and the ability of the two clays displaying the highest adsorption capacities [Fe(3+)-saturated Wyoming montmorillonite, (Fe-SW) and hexadecyltrimethylammonium-saturated Arizona montmorillonite (HDTMA-SA)] to act as carriers for slow release of hexazinone and to reduce herbicide leaching losses was evaluated. Hexazinone formulations based on Fe-SW and HDTMA-SA displayed slow release properties in water and soil/water suspensions, reduced herbicide leaching in soil columns, and maintained herbicidal activity, as compared with the currently available commercial hexazinone formulation (wettable powder). Loosely bound hexazinone-HDTMASA formulations, which led to the slowest breakthrough of hexazinone in soil columns along with the greatest amounts of herbicide released from the clay particles, displayed the most interesting characteristics for their use as slow release formulations and to prevent ground water contamination. Topics: Adsorption; Aluminum Silicates; Chemical Phenomena; Chemistry, Physical; Clay; Herbicides; Soil; Triazines; Water; Water Pollution	2002

Article

Year

The dissipation of hexazinone in tropical soils under semi-controlled field conditions in Kenya.

Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes, 2009, Volume: 44, Issue:7

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 DT(50) 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 microg/g dry soil) was also studied and was found to enhance dissipation to some extent, giving DT(50) values of 18 days and 18.3 days in clay and loam soil types, respectively.

Topics: Aluminum Silicates; Biodegradation, Environmental; Clay; Herbicides; Kenya; Soil; Triazines; Volatilization

2009

Inorganic and organic clays as carriers for controlled release of the herbicide hexazinone.

Journal of agricultural and food chemistry, 2002, Apr-10, Volume: 50, Issue:8

The risk of ground water contamination resulting from rapid leaching of highly soluble pesticides can be minimized through the application of the pesticide adsorbed on a matrix or carrier, which limits the amount of pesticide immediately available for undesirable losses. The use of natural materials for this purpose is of special interest in terms of economy and sustainability. In this work the adsorption of the herbicide hexazinone by two montmorillonites saturated with various inorganic and organic cations was determined and the ability of the two clays displaying the highest adsorption capacities [Fe(3+)-saturated Wyoming montmorillonite, (Fe-SW) and hexadecyltrimethylammonium-saturated Arizona montmorillonite (HDTMA-SA)] to act as carriers for slow release of hexazinone and to reduce herbicide leaching losses was evaluated. Hexazinone formulations based on Fe-SW and HDTMA-SA displayed slow release properties in water and soil/water suspensions, reduced herbicide leaching in soil columns, and maintained herbicidal activity, as compared with the currently available commercial hexazinone formulation (wettable powder). Loosely bound hexazinone-HDTMASA formulations, which led to the slowest breakthrough of hexazinone in soil columns along with the greatest amounts of herbicide released from the clay particles, displayed the most interesting characteristics for their use as slow release formulations and to prevent ground water contamination.

Topics: Adsorption; Aluminum Silicates; Chemical Phenomena; Chemistry, Physical; Clay; Herbicides; Soil; Triazines; Water; Water Pollution

2002