CO2 emission and physical, chemical and microbiological soil attributes in sugarcane management systems

Author(s)

Rose Luiza Moraes Tavares

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Agrícola
• Defense date: 2014-12-02

Examining board members

Zigomar Menezes de Souza; Alan Rodrigo Panosso; Janaína Braga do Carmo; Carlos Eduardo Pellegrino Cerri; Henrique Coutinho Junqueira Franco

• Advisor: Zigomar Menezes de Souza

Abstract

The sugarcane mechanized crop replacing the burned cane have been use by cane mill to improve the soil quality and environment, especially to minimize the greenhouse gases, mainly CO2 gas. This work evaluated CO2 emission of soil in three sites of sugarcane under different systems: burned cane (BC), green cane of 5 years (GC5) and green cane of 10 years (GC10) located in Pradópolis, northeast São Paulo State. In each site was installed grid with 81 points in 1 ha area. The soil CO2 and physical, chemistry and microbiological attributes were evaluated to find possible relations between CO2 and those attributes. The data were interpreted by geoestatistic and multivariate analyzes in different studies. In the work 1, comparisons in CO2 soil emission at two green cane sites (GC5 and GC10) was made and the results showed better CO2 stabilization in the second site (GC10). In the work 2, the CO2 soil emission was compared at three sites of sugarcane (BC, GC5 and GC10) by principal components analysis (multivariate method), where CO2 soil emission at GC10 and less in BC, and the CO2 soil emission was influenced especially by base saturation and pH at burned cane site, and soil moisture and bulk density at green cane sites. The work 3 evaluated the "Potential production" of CO2, N2O and CH4 in three sites of sugarcane (BC, GC5 and GC10) with topography of sites, and the results showed that in the GC10, the CO2, N2O and CH4 stayed concentrated in high topography, whereas in the burned cane (BC), they were concentrated in low topography, what indicated possible erosive process in the BC site, whose tendency is migration of water, gases and soil materials more depression areas, whereas in the green cane site, this effect is minimized by sugarcane trash covering and protecting the soil (AU)

• FAPESP's process: 11/04842-0 - Soil CO2 emission spatial and temporal variability and physical, chemical and microbiological attributes in sugarcane management systems
• Grantee: Rose Luiza Moraes Tavares
• Support Opportunities: Scholarships in Brazil - Doctorate