Simple models and concepts as tools for the study of sustained soil productivity in long-term experiments. I. New soil organic matter and residual effect of P from fertilizers and farmyard manure in Kabete, Kenya

Author： Janssen Bert  

Publisher： Springer Publishing Company

ISSN： 0032-079X

Source： Plant and Soil, Vol.339, Iss.1-2, 2011-02, pp. : 3-16

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