1. Barley, canola and wheat production under different tillage-fallow-green manure combinations on a clay soil in a cold semiarid climate;Arshad;Soil Tillage Res.,1997
2. Conservation tillage: an ecological approach to soil management;Blevins;Adv. Agron.,1993
3. Boerma, H., Gimby, M., Coxworth, E., 1980. A study of energy consumption of different practices in Saskatchewan. Year III. Tech Report No. 103, Publ. No. c 185-1-b-80. Saskatchewan Research Council, Saskatoon, Sask, p. 35.
4. Energy saving through reduction of soil tillage;Bonciarelli,2000
5. Barley, soybean and maize production using ridge tillage, no-tillage and conventional tillage in north-east Italy;Borin;J. Agric. Eng. Res.,1995