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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sugarcane Crop Residue Increases N2O and CO2 Emissions Under High Soil Moisture Conditions

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Vargas, Vitor Paulo [1] ; Cantarella, Heitor [1] ; Martins, Acacio Agostinho [1] ; Soares, Johnny Rodrigues [1] ; do Carmo, Janaina Braga [2] ; de Andrade, Cristiano Alberto [3]
Total Authors: 6
[1] IAC, Soil & Environm Resources Dept, Inst Agron, BR-13013970 Campinas, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Environm Sci, UFSCar, BR-18052780 Sorocaba - Brazil
[3] EMBRAPA, Brazilian Agr Res Corp, Environm Sci, BR-13820000 Jaguariuna - Brazil
Total Affiliations: 3
Document type: Journal article
Source: SUGAR TECH; v. 16, n. 2, SI, p. 174-179, JUN 2014.
Web of Science Citations: 29

Sugarcane crop residues from green cane harvests may affect the greenhouse gas fluxes from the soils. Therefore, it is important to understand how changes in soil moisture covered with cane trash alter the N2O and CO2 emission. The aim of this study was to evaluate N2O and CO2 emission from repacked soil columns incubated with (16 Mg ha(-1)) or without crop residues and N fertilizer (0 or 2.1 g N m(-2)), and as a function of four soil moisture levels (25, 50, 75 and 100 % of water holding capacity). For gas samplings, the columns were closed with a lid and four gas samples were taken in 20 min. The N2O fluxes increased linearly (p < 0.01) with increasing soil moisture regardless of the residue application on soil. However in the columns with trash the moisture effect, on N2O emission rates, was two-fold greater. Every 10 % increase in moisture in relation to the holding capacity resulted in losses equivalent to 790 and 1,640 mu g N m(-2) for the 0 and 16 Mg ha(-1) crop residue rates, respectively. In conditions of low moisture (25 and 50 %), the crop residue did not increase emissions compared to the bare soil. The CO2 emission also was linearly stimulated with increasing soil moisture, regardless of crop residue application. However, the CO2 emission rate was higher with the residue. Our study indicates that the effects of crop residue on greenhouse gas emissions are exacerbated in periods with high soil moisture. (AU)

FAPESP's process: 08/56147-1 - Nitrogen nutrition of sugarcane with fertilizers or diazotrophic bacteria
Grantee:Heitor Cantarella
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 10/05300-4 - Fluxes of greenhouse gases from soils with sugarcane and according nitrogen fertilization and presence of straw on soil
Grantee:Vitor Paulo Vargas
Support type: Scholarships in Brazil - Doctorate