01964naa a2200409 a 450000100080000000500110000800800410001910000180006024500730007826000090015130000150016052007420017565000110091765000210092865000190094965000220096865000190099065000200100965000130102965000120104265000120105465000260106665000200109265000240111265000160113665000190115265000230117165000210119465000090121565300110122465300210123565300310125665300190128765300210130670000260132777302010135315516921996-05-24       1995    bl uuuu     u00u1 u    #d1 aSPEHAR, C. R.  aDevelopment sustainable cropping systems for the Brazilian Savannas.  c1995  ap.325-356.  aThe Brazilian savannas (cerrados) cover an area of 200 million ha. and were on the fringe of agriculture in the country until two decades ago. This extensive low input upland rice and pasture system has been replaced by modern soybean production. Late maturing and aluminum tolerance have expanded soybean adaptability in this environment, supplying 50% of the national production. Breeding work on other traditionally cultivated plants is also reviewed and their potential in the production systems is discussed. Research on improving soil fertility, land development and tillage are discussed in relation to soil conservation and organic matter maintenance. Alternative cropping systems which enhance soil fertility are also presented.  aBrazil  acropping systems  aorganic matter  asoil conservation  asoil fertility  asoil management  asoybeans  atillage  aCerrado  aConservação do Solo  aCultivo do Solo  aFertilidade do Solo  aGlycine Max  aManejo do Solo  aMatéria Orgânica  aPratica Cultural  aSoja  aBrasil  aCultural methods  aDesenvolvimento sustentado  aSustainability  aSustentabilidade1 aSOUZA, P. I. de M. de  tIn: INTERNATIONAL WORKSHOP: moist savannas of Africa: potentials and constraints for crop production, 1994, Cotonou, Republic of Benin. Proceedings. Ibadan, Nigeria: IITA / Rome, Italy: FAO, 1995.