7Conacher J, Conacher A. Organic farming and the environ- ment, with particular reference to Australia [J]. A review Bio- logical Agricultural and Horticulture, 1998, 16:145 -171.
9Reganold J P. Soil quality and profitability of biodynamic and conventional farming systems [ J ]. A review American Journal of Alternative Agriculture, 1995, 10:36-45.