Se discuten varios conceptos relativos al mejoramiento de leguminosas forrajeras y a su adaptacion a suelos acidos de baja fertilidad. Se observa que es raro que un ecotipo nativo selecionado ofrezca todas las caracteristicas requeridas para praderas de pastoreo.

An Act to provide for the registration of professional surveyors, the establishment of a National Council to regulate the standards of conduct and activities of professional surveyors and for matters connected with the practice of the profession of land surveying and land economy.  

This audiotutorial unit (cassette, printed script, 93 color slides, Study guide, self-evaluation test), prepared by the Communications Support Unit at CIAT, is available for use with a manually or automatically synchronized slide projector/cassette tape recorder.