The Brazilian Savannah has big importance to the production of grains, where the predominant cultivation of soybean and corn takes place. However, a small diversity of cultivated species has led to questions about the effects of crops on soil fertility and their interaction with crop performance. In this sense, a current research was developed with the objective of verifying the viability of crop rotation in the summer (corn and soybean) and the use of cover crops in spring, in two systems of soil preparation (conventional and no-tillage). In a region characteristic of climate and Savannah soil. Since it is a long-term experiment, started in 1999, the data obtained from corn and soybean crops were analyzed in the 2011/12, 2012/13 and 2013/14 agricultural years. The experimental design used for the subdivided plot. Two areas were selected for allocation of soil tillage systems (conventional and no-tillage system). Within each area, strains were implanted with monoculture of soybean or corn and strips with soybeans rotated with corn and vice versa. In each system of preparation and cultivation, it was subdivided with cover plants, sown in spring (Sunn remp, showy rattlebox, pearl millet and millet) in addition to a fallow area with spontaneous vegetation. As the characteristics of the agronomic characteristics of soybean and corn crops and the quantification of chemical substances in the soil were evaluated in two depths (0.00-0.10 and 0.10-0.20m). A crop rotation between corn and soybean, with cover crops planted in the spring, greater environmental balance of soil chemical attributes, in Savannah of low altitude; The agronomic characteristics of the corn crop respond positively to the cultivation of cover crops, as much as the system is direct to the conventional system; The soybean presented the best performance of the agronomic characteristics sown after a cover cropping in the spring under a direct flat system; Millet was presented as the best cover crop for soybean cultivation, under a no-tillage system; Sunn remp stood out among the cover crops for corn cultivation.