Research ArticleOpen accessPhrase in the titleEffect of N and K Fertilizers on Nutrient Leaching and Groundwater Quality under Mature Oil Palm in Sabah during the Monsoon PeriodPetronella G. Ah Tung, Mohd Kamil Yusoff, Nik Muhamad Majid et al.American Journal of Applied Sciences, Vol. 6, Issue 10 · 31 Oct 2009 · 10,143 accessesView PDFCite