RESEARCH ARTICLE Vol. 22 (1) April 2010, p. 721-728 DOWNWARD MOVEMENT OF CHLORPYRIFOS IN THE SOIL OF AN OIL PALM PLANTATION IN SEPANG, SELANGOR, MALAYSIA HALIMAH Muhamad * ; TAN Yew Ai * ; ISMAIL Sahid ** ; NASHRIYAH Mat + FULL TEXT | DOWNLOAD PDF