01664nam a2200205 a 450000100080000000500110000800800410001910000200006024501400008026001830022030000160040352008880041965000280130765000290133565000120136465000330137665000150140970000200142470000140144411979102022-05-30       1990    bl uuuu     u00u1 u    #d1 aTEIXEIRA, S. M.  aTechnological change in agriculturebthe impact of alternative agricultural systems for the Central West Brazil.h[electronic resource]  aIn: SEMINAIRE D'ECONOMIE ET DE SOCIOLOGIE - ECONOMIE DES FILIERES EN REGIONS CHAUDES - FORMATION DES PRIX ET ECHANGES AGRICOLES, 10., 1989, Montpellier. Actes. Paris: CIRADc1990  ap. 363-378.  aThe National Research Center for Rice and Beans (CNPAF) at the Brazilian Agricultural Research Enterprise (EMBRAPA) has been supported by lRAT/ClRAD with a joint research program for alternative, sustainable agricultural systems for "cerrados" environment of Central Brazil, for the last six years. New technologies have been developed and/or adapted to the differing environments. Sustainable production systems for upland rice have been developed as altematives to soybean monoculture, and technology transfer to producers is being implemented. Rice has, traditionally, being a marginal and itinerant upland crop, preceding soybean production and cattle raisin after opening new cerrado lands. The use of soil management practices and natural resources and new crop rotation technologies constitute a very promising production system to replace soybean and sugar cane monocultures.  aAgricultura Alternativa  aAgricultura Sustentável  aCerrado  aDesenvolvimento Sustentável  aTecnologia1 aYOKOYAMA, L. P.1 aSEGUY, L.