Sugarcane

Cantarella, Heitor; Buckeridge, Marcos Silveira; Sluys, Marie‐Anne Van; Souza, Anete Pereira de; Garcia, A. F.; Nishiyama, Milton Yutaka; Filho, Rubens Angulo; Cruz, Carlos de Brito; Souza, Gláucia Mendes

doi:10.1201/b11711-24

Cited by 3 publications

(1 citation statement)

References 175 publications

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“…However, the phenology of the sugarcane plant may provide insights on the lower N 2 O emissions in all treatments in the rainy season. Sugarcane is a fast‐growing plant, with high N demand during the initial stages of ratoon growth (Franco et al., ; Mariano et al., ), and can accumulate 30 to 60 t/ha of dry matter in a single season (Cantarella et al., ; CONAB, ). If N is applied during the growing stage of the plant, the rapid uptake of nutrients, including N, will reduce the available N for microbial‐related processes of N 2 O emission.…”

Section: Discussionmentioning

confidence: 99%

Dominance of bacterial ammonium oxidizers and fungal denitrifiers in the complex nitrogen cycle pathways related to nitrous oxide emission

et al. 2018

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Organic compounds and mineral nitrogen (N) usually increase nitrous oxide (N 2 O) emissions. Vinasse, a by-product of bio-ethanol production that is rich in carbon, nitrogen, and potassium, is recycled in sugarcane fields as a bio-fertilizer. Vinasse can contribute significantly to N 2 O emissions when applied with N in sugarcane plantations, a common practice. However, the biological processes involved in N 2 O emissions under this management practice are unknown. This study investigated the roles of nitrification and denitrification in N 2 O emissions from straw-covered soils amended with different vinasses (CV: concentrated and V: nonconcentrated) before or at the same time as mineral fertilizers at different time points of the sugarcane cycle in two seasons. N 2 O emissions were evaluated for 90 days, the period that occurs most of the N 2 O emission from fertilizers; the microbial genes encoding enzymes involved in N 2 O production (archaeal and bacterial amoA, fungal and bacterial nirK, and bacterial nirS and nosZ), total bacteria, and total fungi were quantified by real-time PCR. The application of CV and V in conjunction with mineral N resulted in higher N 2 O emissions than the application of N fertilizer alone. The strategy of vinasse application 30 days before mineral N reduced N 2 O emissions by 65% for CV, but not for V. Independent of rainy or dry season, the microbial processes were nitrification by ammonia-oxidizing bacteria (AOB) and archaea and denitrification by bacteria and fungi. The contributions of each process differed and depended on soil moisture, soil pH, and N sources. We concluded that amoA-AOB was the most important gene related to N 2 O emissions, which indicates that nitrification by AOB is the main microbial-driven process linked to N 2 O emissions in tropical soil. Interestingly, fungal nirK was also significantly correlated with N 2 O emissions, suggesting that denitrification by fungi contributes to N 2 O emission in soils receiving straw and vinasse application. K E Y W O R D Sdenitrification, dry-wet season, greenhouse gas, microbial ecology, nitrification, quantitative real-time

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Section: Discussionmentioning

confidence: 99%

Dominance of bacterial ammonium oxidizers and fungal denitrifiers in the complex nitrogen cycle pathways related to nitrous oxide emission

et al. 2018

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Identification of genes from the general phenylpropanoid and monolignol-specific metabolism in two sugarcane lignin-contrasting genotypes

et al. 2020

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Enhanced-Efficiency Fertilizers in Nitrous Oxide Emissions from Urea Applied to Sugarcane

et al. 2015

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The environmental benefits of producing biofuels from sugarcane have been questioned due to greenhouse gas emissions during the biomass production stage, especially nitrous oxide (N 2 O) associated with nitrogen (N) fertilization. The objective of this work was to evaluate the use of nitrification inhibitors (NIs) dicyandiamide (DCD) and 3,4 dimethylpyrazole phosphate (DMPP) and a controlled-release fertilizer (CRF) to reduce N 2 O emissions from urea, applied at a rate of 120 kg ha -1 of N. Two field experiments in ratoon cycle sugarcane were performed in Brazil. The treatments were (i) no N (control), (ii) urea, (iii) urea+DCD, (iv) urea+DMPP, and (v) CRF. Measurements of N 2 O fluxes were performed using static chambers with four replications. The measurements were conducted three times per week during the first 3 mo and biweekly afterward for a total of 217 and 382 d in the first and second seasons, respectively. The cumulative N 2 O-N emissions in the first ratoon cycle were 1098 g ha -1 in the control treatment and 1924 g ha -1 with urea (0.7% of the total N applied). Addition of NIs to urea reduced N 2 O emissions by more than 90%, which did not differ from those of the plots without N. The CRF treatment showed N 2 O emissions no different from those of urea. The results were similar in the second ratoon: the treatment with urea showed N 2 O emissions of 0.75% of N applied N. Application of NIs resulted in a strong reduction in N 2 O emissions, but CRF increased emissions compared with urea. We therefore conclude that both NIs can be options for mitigation of greenhouse gas emission in sugarcane used for bioenergy.

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Sugarcane

Cited by 3 publications

References 175 publications

Dominance of bacterial ammonium oxidizers and fungal denitrifiers in the complex nitrogen cycle pathways related to nitrous oxide emission

Dominance of bacterial ammonium oxidizers and fungal denitrifiers in the complex nitrogen cycle pathways related to nitrous oxide emission

Identification of genes from the general phenylpropanoid and monolignol-specific metabolism in two sugarcane lignin-contrasting genotypes

Enhanced-Efficiency Fertilizers in Nitrous Oxide Emissions from Urea Applied to Sugarcane

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