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Greenhouse gas emissions and carbon stock as a function of liming and soil preparation in sugarcane

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Ana Stella Freire Gonçalves
Total Authors: 1
Document type: Doctoral Thesis
Press: Botucatu. 2020-11-18.
Institution: Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agronômicas. Botucatu
Defense date:
Advisor: Juliano Carlos Calonego

The increase in mechanization in the sugarcane cultivation areas increases soil compaction and reduces root growth, productivity, and longevity of the sugarcane field. The deep soil preparation in planting band and traffic control can result in better rooting and water and nutrient use with a consequent increase in biomass production, especially when accompanied by adequate liming. However, this technique alters carbon (C) input and output in the soil and can affect the C stock and balance in the soil–plant–atmosphere system. In an area of cane-plant cultivation, this study aimed to evaluate the effect of different soil preparations and dose of science calculation, as well as an interaction between these factors, in the response to the soil C stock, in the organic matter (MOS) formed quality, in the greenhouse gases emissions (GHG) and in stalk productivity (TCH) and sugar production, estimating the C balance in the soil-plant-atmosphere system. To this end, an experiment was carried out on medium textured soil, using a randomized block design, in a split plot scheme, with four replications. The plots consisted by different soil tillage systems (conventional tillage, deep tillage and deep tillage modified) and the subplots by limestone doses (0, 1, 2 and 3-times the recommended dose). The data were subject to variance analysis (p ≤ 0.05) and compared by the least significant difference (LSD) test (p ≤ 0.05) in the case of qualitative variables and by means of regression analysis in the case of the limestone dose-related effect. Deep soil preparation in the planting band in conjunction with application of lime doses higher than the recommended values promotes a higher CO2 emission, but on the other hand guarantees a greater C supply via aerial and root biomass, ensuring greater cane field productivity and consequently, less relative GHG. Therefore, studies involving the deep banded preparation system, combined with the adjustment of limestone dose recommendations for the State of São Paulo, may be a strategy for sequestering C in plant-cane cultivation areas. (AU)

FAPESP's process: 17/18988-3 - Greenhouse gases emission and carbon balance in function of liming and soil tillage in sugarcane
Grantee:Ana Stella Freire Gonçalves
Support Opportunities: Scholarships in Brazil - Doctorate