Basic technics in ecological farming papers presented at the 2nd international conference held by the IFOAM, Montreal, October 1-5, 1978 The Maintenance of soil fertility : exposes presentes a la 3 eme conference internationale organisee par IFOAM, Bruxelles, du 3 au 5 Septembre 1980 edited by Stuart Hill, Pierre Ott - Basel, Switzerland Birkhauser Verlag 1982 - 365 p. ill. 24 cm.

English and French


Organic farming
Agricultural ecology
Agriculture
Soil fertility

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