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Soil pH does not interfere with nitrification inhibitor efficiency for reducing N2O emissions from soils treated with concentrated vinasse and urea

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Author(s):
Oliveira, Bruna G. ; Lourenco, Kesia S. ; Carvalho, Joao Luis N. ; Gonzaga, Leandro C. ; Teixeira, Maria Carolina ; Tamara, Ana Flavia ; Cantarella, Heitor
Total Authors: 7
Document type: Journal article
Source: Geoderma; v. 426, p. 9-pg., 2022-08-10.
Abstract

This study addresses the assessment of potential nitrification inhibitor (NI) 3,4-dimethylpyrazol-phosphate for mitigation of nitrous oxide (N2O) emissions from the joint application of concentrated vinasse (CV) and urea in soils under different pHs. An incubation experiment was performed under controlled conditions to evaluate the effect of the organo-mineral fertilization containing CV and Urea (N rate: 120 kg N ha(-1)) on N2O emissions, as well as the efficiency of the NI addition, at different soil pHs (4.5 and 6.0). The treatments were: Control; Urea; Urea + NI; CV; CV + Urea; and CV + Urea + NI. The soil pH greatly influenced the N2O production with emissions 3.8-fold higher at pH 6.0 than at pH 4.5. Besides, the joint application of CV + Urea increased the N2O emissions by 1.3 and 2.9-fold (185 and 1141 mg N m(-2)) compared to Urea treatment (138 and 391 mg N m(-2)) at pH 4.5 and 6.0, respectively. The addition of NI was efficient under both soil pHs, decreasing N2O emissions by 92 and 88 % in the Urea treatment and 71 % and 91 % in the CV + Urea treatment at pH 4.5 and 6.0, respectively. Our results indicate that soil pH has a large influence on N2O emissions and little effect on the NI efficiency. (AU)

FAPESP's process: 17/02299-4 - Nitrification inhibitor as strategy to mitigate N2O emissions in sugarcane production
Grantee:Bruna Gonçalves de Oliveira Carvalho
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 18/20793-9 - Nitrification and urease inhibitors as strategies to mitigate N2O emissions and NH3 volatilization in sugarcane production with addition of organic residues
Grantee:Heitor Cantarella
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 19/12557-6 - Distinguishing microbial pathways to nitrous oxide emissions following addition of concentrated vinasse and the nitrification inhibitor DMPP to sugarcane soil
Grantee:Bruna Gonçalves de Oliveira Carvalho
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 18/20698-6 - Nitrification inhibitor as strategy to mitigate N2O emissions and its impacts on the active nitrifying and denitrifying soil microbial communities after concentrated vinasse and mineral N application
Grantee:Késia Silva Lourenço
Support Opportunities: Scholarships in Brazil - Post-Doctoral