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Zulkefli M., . and Norziana Z.Z., . (2008) Effect of urea coated with different concentrations of nitrohumic acid NHA on ammonia volitilization. [Proceedings Paper]
Illani Z.I, . and Faridah M., . and Aini Z., . and Zulkefli M., . (2008) Effects of organic amendment on antioxidant activity in Brassica chinensis. [Proceedings Paper]
Zulkefli M., . and Liza Nuriati L.K.C., . (2008) The effect of compost with different inoculum sources on carbon dioxide emission. [Proceedings Paper]
Zulkefli M., . and Kamaruzaman Al.B., . and Mazuraa M., . (2007) Sustainable supply of herbs and medicinal plants: issues and strategies. [Proceedings Paper]