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Mohd Taufik M. Y., . and Ahmed O. H., . and Nik Muhamad A. M., . (2009) Effects of mixing urea with acid sulphate soil and humic acid on ammonia loss exchangeable ammonium and available nitrate. [Proceedings Paper]
Mohamad Nasir H., . and Ahmed O. H., . and Jiwan M., . and Auldry C. P., . and Nik Muhamad A. M., . (2009) Production of potassium and calcium hydroxide compost and humic acid from sago Metroxylon sagu waste. [Proceedings Paper]
Roslliza S., . and Ahmed O. S., . and Nik Muhamad A. M., . (2009) Reduction of ammonia volatilization through mixing with humic and fulvic acids. [Proceedings Paper]