Oil Palm Bulletin No. 37 (November 1998) p1-14
Empty fruit bunch mulching and nitrogen fertilizer amendment : the resultant effect on oil palm performance and soil properties
HAMDAN Abu Bakar , AHMAD TARMIZI Mohamad , MOHD TAYEB Dolmat

Oil Palm Bulletin No. 13 (November 1986) p1 - 11
Volatilisation losses of nitrogen from urea applied to Malaysian soils Effect of granular size and soil properties
H.L. Foster and Zin Z. Zakaria