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Nitrification and urease inhibitors as strategies to mitigate N2O emissions and NH3 volatilization in sugarcane production with addition of organic residues

Abstract

The greenhouse gases (GHG) emissions associated with the use of nitrogen fertilizers, in particular N2O, are of utmost importance for the sustainability of ethanol from sugarcane. Previous studies point to relatively low N2O emissions when N fertilizers are applied in the sugarcane crop in São Paulo, but such emissions can increase considerably when fertilizers are used together with vinasse and in areas with straw. The ethanol industry gradually tends to concentrate vinasse rather than applying the product in natura in the sugar cane fields. One of the alternatives is to produce fluid fertilizers from concentrated vinasse (CV) and mineral nutrients, reducing application costs. With this, N2O emissions can be high and eventually compromise the environmental gains obtained with the use of ethanol. The most likely source of fertilizer for CV mixing is urea (U), which is subject to N losses by NH3 volatilization if applied to the soil surface, which can also reduce the efficiency of the system. The present proposal aims to evaluate the N (N2O and NH3) emissions, the microbial processes involved and mitigation measures, including the use of nitrification inhibitors and urease inhibitors, through four subprojects to be conducted in the field and laboratory. With the new legislation of RenovaBio, the greater the reductions in GHG emissions from bioenergy produced, the higher will be the grower's financial return. Therefore, adequate indicators of GHG emissions from the production process and knowledge that lead to mitigating technologies, such as those aimed at in this study, besides the inherent scientific importance, are of interest to the productive sector. (AU)

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Scientific publications (7)
(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)
JOHNNY RODRIGUES SOARES; HEITOR CANTARELLA. Dynamics of ammonia volatilization from NBPT-treated urea in tropical acid soils. Scientia Agricola, v. 80, . (18/20793-9)
JORIS, HELIO ANTONIO WOOD; VITTI, ANDRE CESAR; FERRAZ-ALMEIDA, RISELY; OTTO, RAFAEL; CANTARELLA, HEITOR. Long-term N fertilization reduces uptake of N from fertilizer and increases the uptake of N from soil. SCIENTIFIC REPORTS, v. 10, n. 1, . (08/56147-1, 17/25566-8, 18/20793-9)
OLIVEIRA, BRUNA G.; LOURENCO, KESIA S.; CARVALHO, JOAO LUIS N.; GONZAGA, LEANDRO C.; TEIXEIRA, MARIA CAROLINA; TAMARA, ANA FLAVIA; CANTARELLA, HEITOR. Soil pH does not interfere with nitrification inhibitor efficiency for reducing N2O emissions from soils treated with concentrated vinasse and urea. Geoderma, v. 426, p. 9-pg., . (17/02299-4, 18/20793-9, 19/12557-6, 18/20698-6)
OLIVEIRA, BRUNA G.; LOURENCO, KESIA S.; CARVALHO, JOAO LUIS N.; GONZAGA, LEANDRO C.; TEIXEIRA, MARIA CAROLINA; TAMARA, ANA FLAVIA; SOARES, JOHNNY R.; CANTARELLA, HEITOR. New trends in sugarcane fertilization: Implications for NH3 volatilization, N2O emissions and crop yields. Journal of Environmental Management, v. 342, p. 10-pg., . (17/02299-4, 19/12557-6, 18/20698-6, 18/20793-9, 17/11523-5)
SOARES, JOHNNY RODRIGUES; CANTARELLA, HEITOR. Dynamics of ammonia volatilization from NBPT-treated urea in tropical acid soils. CIENTIA AGRICOL, v. 80, p. 8-pg., . (18/20793-9)
LOURENCO, KESIA SILVA; CANTARELLA, HEITOR; SOARES, JOHNNY RODRIGUES; GONZAGA, LEANDRO CAROLINO; DE CAMPOS MENEGALE, PAULA LEITE. DMPP mitigates N2O emissions from nitrogen fertilizer applied with concentrated and standard vinasse. Geoderma, v. 404, . (13/50365-5, 18/20698-6, 18/20793-9, 13/12716-0)
CARVALHO, JOAO LUIS NUNES; OLIVEIRA, BRUNA GONCALVES; CANTARELLA, HEITOR; CHAGAS, MATHEUS FERREIRA; GONZAGA, LEANDRO CAROLINO; LOURENCO, KESIA SILVA; BORDONAL, RICARDO OLIVEIRA; BONOMI, ANTONIO. Implications of regional N2O-N emission factors on sugarcane ethanol emissions and granted decarbonization certificates. RENEWABLE & SUSTAINABLE ENERGY REVIEWS, v. 149, . (18/20698-6, 18/20793-9, 19/12557-6, 17/02299-4)

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