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Abdul Rashid Ahmad, . and Ismail Abu Bakar, . Potassium quantity and intensity variations of soils under anaerobic condition in relation to their mineralogical properties. pp. 123-130. ISSN 0128-0686
M.L. Sharma, . and Aminuddin Yusoff, . and M.Zulkefli, . and M. Mohd Zain, . and Abdul Rashid Ahmad, . (1996) Variations on the inorganic constituents in groundwater in tobacco agrosystem. [Proceedings Paper]
Lau C.H., . and Zaharah Abdul Rahman, . and Abdul Rashid Ahmad, . (1992) Phosphate : its chemistry and availability in Malaysian soils. [Proceedings Paper]