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Anuar Abd Rahim, . and Zulkifli Shamsuddin, . and Othman Yaacob, . Contribution of nitrogen to growth of maize in legume-maize rotation on limed ultisols. pp. 173-184. ISSN 0126-6128
Othman Yaacob, . Nitrogen economy of a sandy soil under groundnut: maize cropping sequence at Kuala Brang Trengganu. pp. 30-33. ISSN 0126-6128
Othman Yaacob, . and Mohd. Pilus Zambri, . and Abdul Jabar Mohd. Kamal, . and S. Paramananthan, . Penentuan faktor-faktor tanah ke atas tumbesaran gajus di kawasan tanah bris : Bahagian I. pp. 200-206. ISSN 0126-6128