ECONOMIC ANALYSIS OF SOIL MANAGEMENT SYSTEMS AND CROP ROTATION
Keywords:
costs, net return, conventional soil preparation, minimum lillage, no-tillage.Abstract
During four years, in Passo Fundo, RS, Brazil, the effects of soil management and crop rotation systems were assessed. Four soil management systems — 1) no-tillage, 2) minimum tillage, 3) conventional tillage using a disk plow, and 4) conventional tillage using a moldboard plow—and three crop rotation systems [system I (wheat/soybean), system II (wheat/soybean and common vetch/sorghum or corn), and system I II (wheat/soybean, common vetch/sorghum or com and wh i te oats/soybean)I were compared. An experimental design of blocks at random with split-plots and three replications was used. The main plot was formed by the soil management systems, while the split-plots consisted of the crop rotation systems. Economic analysis from 1994 to 1997 is presented in this papei. No,til lage (R$ 412.49) and minimum tillage (R$ 389.37) presented higher net returns, while conventional tillage using a disk plow remained in intermediate position (R$ 339.90) and tillage using a moldboard plow showed the lowest net return (R$ 322,18). No significam differences were observed for net return as a result of crop rotation systems.
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