In the no-tillage system (NT) there are several options of cover crops, in which their use can modify the abundance and diversity of soil microorganisms over time. Microorganisms, in turn, exert a great influence on the dynamics and soil carbon stock, with effects on their attributes and, consequently, on their productive potential. Therefore, it is important to evaluate if the microbial community is changing according to the cultivated plants, and what is its contribution to soil C dynamics. The objective of this work is to evaluate the effect of crop sequences on microbial abundance and diversity and their influence on soil C stock under long-term NT. The experiment has been conducted since 2001 in a 3x7 factorial strip design. Of which: three summer crop sequences: maize monoculture (MM), soybean monoculture (SS) and soybean/maize (SM) rotation, and by seven winter crops: corn, sunflower, oilseed radish, pearl millet, pigeon pea, grain sorghum and sunn hemp, carried out according to a split-block design, with three replications. Will be evaluated: soil carbon stock, abundance and diversity of microorganisms and enzyme activities ²-glucosidase, arylsulfatase and acid phosphatase. With the data of the present work, and with data from previous years, will be evaluated the contribution of crop sequences in the microbial community and annual contribution of C to soil, seeking relationships of microorganisms with C sequestration and its effects on soil attributes.
News published in Agência FAPESP Newsletter about the scholarship: