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Crop residues in rotations systems as determinants of soil aggregate fractionation and C and N mineralization

Grant number: 15/23389-6
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): March 15, 2016
Effective date (End): December 14, 2016
Field of knowledge:Agronomical Sciences - Agronomy - Crop Science
Principal Investigator:Juliano Carlos Calonego
Grantee:João Paulo Gonsiorkiewicz Rigon
Supervisor: Alan Joseph Franzluebbers
Host Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil
Research place: North Carolina State University (NC State), United States  
Associated to the scholarship:13/23359-4 - Management systems and crop sequences as determinants in the amount and quality of the soil organic matter., BP.DR

Abstract

Soil aggregate distribution and associated C and N fractions and soil C and N mineralization are important for understanding soil quality dynamics. The influence of management practices on soil C and N concentrations and aggregate distribution depends on the quantity and quality of crop residues at the soil surface under no-till. This project is a continuation of two experiments initiated in 2003 on a Typic Rhodudalf (TR) and in 2006 on a Rhodic Hapludox (RH) at the Lageado Experimental Farm, College of Agricultural Sciences - UNESP, Botucatu, SP, Brazil. Treatments were (1) different dry-season crops - triticale or sunflower in TR and ruzigrass, grain sorghum, and ruzigrass + grain sorghum in RH and (2) different spring cover crops - pearl millet, sunn hemp, and sorghum-sudangrass in both experiments. In the Typic Rhodudalf, there was also a treatment with a bare fallow. Soybean was grown every year in the summer. Soil samples were collected at 0.0-0.1 and 0.1-0.2 m depths to determine Wet-aggregate distribution and aggregate-associated C and N concentrations and soil C and N mineralization in both experiments. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RIGON, JOAO PAULO GONSIORKIEWICZ; CALONEGO, JULIANO CARLOS; CAPUANI, SILVIA; FRANZLUEBBERS, ALAN J.. Soil organic C affected by dry-season management of no-till soybean crop rotations in the tropics. PLANT AND SOIL, v. 462, n. 1-2, . (13/23359-4, 17/23029-5, 15/23389-6)
RIGON, J. P. G.; FRANZLUEBBERS, A. J.; CALONEGO, J. C.. Soil aggregation and potential carbon and nitrogen mineralization with cover crops under tropical no-till. JOURNAL OF SOIL AND WATER CONSERVATION, v. 75, n. 5, p. 601-609, . (15/23389-6, 13/23359-4)
GONSIORKIEWICZ RIGON, JOAO PAULO; COSTA CRUSCIOL, CARLOS ALEXANDRE; CALONEGO, JULIANO CARLOS; PAVINATO, PAULO SERGIO; AZEVEDO, ANTONIO CARLOS; ROSOLEM, CIRO ANTONIO. Intensive crop rotations and residue quality increase soil phosphorus lability under long-term no-till in tropical soils. SOIL & TILLAGE RESEARCH, v. 223, p. 8-pg., . (17/23029-5, 15/23389-6, 13/23359-4)

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