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

Oil Palm Bulletin No. 10 (May 1985) p1 - 9
Volatilisation losses of nitrogen from urea applied to Malaysian soils 1.Effect of application rate and the admixture of other fertilisers
FOSTER, H L tan