Organic matter contribution to soil fertility improvement and maintenance in red Alder （Alnus rubra） silvopastoral systems
Ronnie M. Mmolotsi[1] Zewge Teklehaimanot[2]
[1]Botswana College of Agriculture, Private Bag 0027, Gaborone, Botswana [2]University of Wales, Bangor, Gwynedd, LL57 2UW, UK
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