4Carlos Crovetto Lamarca.Stubble over the soil[M].Madison:American Society of Agronomy Inc.,1996.
5Neil J Southorn.Future directions for dry land soil management under direct seeding techniques-an Australian perspective[C]∥ Proceedings of 2004 Western States Conservation Tillage Conference,University of California,USA,2004.
6FAO.World agriculture towards 2015/2030[R].FAO,2003.
8Milton A S,Glover B T.No-till and surface-tillage agriculture the tillage revolution[M].New York:Wiley-Interscience Publication,1986.
9Milton Coughenour C,C Shankariah.Conservation tillage and cropping innovation-constructing the new culture of agriculture[M].Iowa:Iowa State University Press,2001.
10Ralph P.Analyzing future farming practices today[C]∥ Proceedings of 2004 Western States Conservation Tillage Conference,University of California,USA,2004.
