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Agroforestry and soil fertility : the eleventh hypothesis - shade . Agroforestry Today 2 : 14-15 . Wiersum , K. F. 1981. Outline of the agroforestry concept . In : Viewpoints in agroforestry . K. F. Wiersum ( ed . ) . | |
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Agrofo- restry and soil fertility : root nodulation- the twelfth hypothesis . Agroforestry Today 2 : 9-10 . Wilson , J. R. 1990. Agroforestry and soil fertility : the eleventh hypothesis - shade . Agroforestry Today 2 : 14-15 . | |
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Wilson J.R. , " The eleventh hypothesis : shade , agroforestry and soil fertility " , in Agroforestry Today , Vol . 2 no . 1 : 15-16 , ICRAF , Kenya , January / March 1990 . * Wong C.C. and J.R. Wilson , " Effects of shading on the ... | |
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