ECONOMIC ANALYSIS OF SOIL MANAGEMENT SYSTEMS AND CROP ROTATION
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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