Effect of N, P and K humates on dry matter of Zea mays and soil pH, exchangeable
Osumanu Haruna Ahmed1*, Shamsuddin Rosliza1, Nik Muhamad Ab. Majid2
and Mahamadu Boyie Jalloh3
1Department of Crop Science, Faculty of Agriculture and Food Sciences, University Putra Malaysia,
Bintulu Campus, 97008 Bintulu, Sarawak, Malaysia.
2Department of Forest Management, Faculty of Forestry, University Putra Malaysia, 43400 UPM,
Serdang, Selangor, Malaysia.
3School of Agriculture Universiti Sabah Malaysia Sandakan, Sabah Malaysia
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