By Amalu Uche C.   Okon Paul B.   in Journal of Plant Nutrition

ISSN:0190-4167|38|7|988-1005

Taylor & Francis Ltd‎(2015)‎

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By Okon Paul B   Babalola O   in Journal of Sustainable Agriculture

ISSN:1044-0046|27|3|93-116

Haworth Press‎(2006)‎

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