Browsing by Author "W. Y. Wan Abdullah"

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    Fate of Chlorothalonil, Chlorpyrifos and Profenofos in a vegetable farm in Cameron Highlands, Malaysia
    (Springer, 2005) C. K. Ngan; U. B. Cheah; W. Y. Wan Abdullah; K. P. Lim; B. S. Ismail
    The fate of chlorothalonil, chlorpyrifos and profenofos in sandy loam soil under tropical condition was studied in a vegetable plot in the Cameron Highlands, Malaysia. The plot was treated with chlorothalonil, chlorpyrifos and profenofos according to normal agricultural practices of the Cameron Highlands. Water (runoff and lysimeter), soil and bedload sediment samples were taken according to a sampling schedule. Residues in water, soil and bedload sediment samples were laboratory analysed to determine amount.
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    Modelling pesticide and nutrient transport in the Cameron Highlands, Malaysia Agro-Ecosystems
    (Springer, 2005) W. Y. Wan Abdullah; B. Y. Aminuddin; M. Zulkifli
    Cameron Highlands has a long history of intensive horticulture especially vegetable and flower cultivation. This industry uses large amounts of nutrients and pesticides. Several simulation models were used to assess the movement of pesticides and nutrients in relation to agronomic practices in farm plots cultivated with cabbage and chrysanthemum.
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    Prediction of soil and nutrient losses in a highland catchment
    (Springer, 2005) Ghulam M. Hashim; W. Y. Wan Abdullah
    A simulation study using GLEAMS (Groundwater Loading Effects of Agricultural Management Systems) was conducted at a catchment presently under tea farming in Cameron Highlands, Malaysia. Soil, water and nutrient transport associated with several alternative land uses was studied. In addition, the effect of a disruptive form of land clearing on soil, water and nutrient losses was also investigated. Modelling with GLEAMS required information from field measurements and observations, laboratory analyses, guide tables, industry records, maps and reports published by soil survey and meteorological departments.
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    Sustainability of current agricultural practices in the Cameron Highlands, Malaysia
    (Springer, 2005) B. Y. Aminuddin; M. H. Ghulam; W. Y. Wan Abdullah; M. Zulkefli; R. B. Salama
    A study on the sustainability of these agro-ecosystems was conducted. Results indicated that soil loss was in the range of 24-42 ton/ha/yr under vegetables and 1.3 ton under rain-shelter. Sediment load in the vegetable sub-catchment reached 3.5 g/L, 50 times higher than that associated with flowers under rain-shelter and tea. The sediments contained high nutrient loads of up to 470 kg N/ha/yr. The N, P and K lost in runoff from cabbage farms was 154 kg/season/ha, whereas in chrysanthemum farms it was 5 kg. In cabbage farms, the N, P, and K lost through leaching was 193 kg/season/ha. The NO3-N concentration in the runoff from the cabbage farms reached 25 ppm but less than 10 ppm in runoff from rain-shelters. Inorganic pollution in the rivers was within the acceptable limit of 10 ppm.