Abstract
• Vinasse concentration (CV) and enrichment with nutrients is a new reality of sugarcane sector; • The organo-mineral fertilization with CV and urea increased N 2 O emissions; • Soil acidification reduced the nitrification process decreasing N 2 O emissions; • Nitrification inhibitor was an effective strategy to mitigate N 2 O emissions; This study addresses the assessment of potential nitrification inhibitor (NI) 3,4-dimethylpyrazol-phosphate for mitigation of nitrous oxide (N 2 O) 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 N 2 O 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 N 2 O 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 N 2 O 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 N 2 O 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 N 2 O emissions and little effect on the NI efficiency.
Published Version
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