By Bayu W.   Rethman N.   Hammes P.   Alemu G.   in Journal of Plant Nutrition

ISSN:0190-4167|29|2|391-407

Taylor & Francis Ltd‎(2006)‎

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By Bayu W.   Rethman N.F.G.   Hammes P.S.   in Journal of Sustainable Agriculture

ISSN:1044-0046|25|2|113-136

Haworth Press‎(2005)‎

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