School of Environmental and Natural Resource Sciences, Faculty
of Science and Technology,
Universiti Kebangsaan Malaysia, 43600 UKM, Bangi,
of Environmental and Natural Resource Sciences, Faculty of Science and
Universiti Kebangsaan Malaysia, 43600
UKM, Bangi, Malaysia
06 August 2011
Laboratory experiments were conducted to evaluate
adsorption, desorption and mobility of metsulfuron-methyl in soils of the oil palm agroecosystem consisting of the Bernam,
Selangor, Rengam and Bongor
soil series. The lowest adsorption of metsulfuron-methyl
occurred in the Bongor soil (0.366 ml g-1),
and the highest in the Bernam soil (2.837 ml g-1).
The Kfads (Freundlich) values of metsulfuron-methyl were 0.366, 0.560, 1.570 and 2.837 ml
g-1 in Bongor, Rengam,
Selangor and Bernam soil,
respectively. The highest Kfdes value of
metsulfuron-methyl, observed in the Bernam soil, was 2.563 indicating low desorption
0.280 (relatively strong retention). In contrast, the lowest Kfdes value of 0.564 was observed for the Bongor soil, which had the lowest organic matter (1.43%)
and clay content (13.2%). Soil organic matter and clay content were the main
factors affecting the adsorption of metsulfuron-methyl.
The results of the soil column leaching studies suggested that metsulfuron-methyl has a moderate potential for mobility
in the Bernam and Bongor
soil series with 19.3% and 39%, respectively for rainfall at 200 mm. However,
since metsulfuron-methyl is applied at a very low
rate (the maximum field application rate used was 30 g ha-1) and
is susceptible to biodegradation, the potential for ground water
contamination is low.? ???
Metsulfuron-methyl, Mobility, Leaching?
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