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Microbial abundance, diversity and effects on soil carbon stock in no-tillage system

Grant number: 19/27226-5
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): October 01, 2020
Effective date (End): September 30, 2021
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:José Eduardo Corá
Grantee:Henildo de Sousa Pereira
Supervisor abroad: Rattan Lal
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
Local de pesquisa : Ohio State University, United States  
Associated to the scholarship:19/10278-2 - Microbial diversity and effects on soil attributes, soil carbon stock, and crop yield in no-tillage system, BP.DR

Abstract

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.