Abstract
The objective of this study was to evaluate soil management and crop rotation systems. The treatments consisted of four types of soil management: 1) no-tillage, 2) minimum tillage, 3) conventional tillage with disc plows, and 4) conventional tillage with moldboard plows, and three crop rotation systems: system I - wheat/soybean; system II - wheat/soybean and vetch/sorghum; and system III - wheat/soybean, vetch/sorghum and white oat/soybeans. An experimental design of randomized blocks with split-plots and three replicates was used. The main plot consisted of soil management systems, while the split-plots consisted of crop rotation systems. Maize and sorghum were the crops that showed the highest energy return in relation to the other studied species. No-tillage showed higher energy conversion and balance (12.31 and 45,011 Mcal ha-1) than minimum tillage (11.33 and 41,100 Mcal ha-1), conventional tillage using disk plow (9.94 and 34,142 Mcal ha-1) and conventional tillage using moldboard plow (10.21 and 35,170 Mcal ha-1), respectively. Wheat in crop rotation had higher energy efficiency than the monoculture of this cereal.
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