Application of controlled-release urea to maintain rice yield and mitigate greenhouse gas emissions of rice–crayfish coculture field

Xu, Qiang; Dai, Linxiu; Shang, Ziyin; Zhao, Ying; Li, Jingyong; Dou, Zhi; Yuan, Xiaochun; Gao, Hui

doi:10.1016/j.agee.2022.108312

Cited by 13 publications

(11 citation statements)

References 49 publications

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“…Our findings suggest that, compared to CK, the N fertilization treatments significantly affected N 2 O emissions. The CRU significantly decreased the soil N 2 O emissions from lettuce fields compared to conventional N fertilization ( Figure 1 and Figure 3 ), which was in accordance with previous findings [ 10 , 14 , 37 ]. The soil NH 4 + -N and NO 3 − -N levels were significantly lower under CRU than ON, possibly because conventional urea dissolved rapidly in the soil solution upon entering the soil.…”

Section: Discussionsupporting

confidence: 92%

“…We found that compared with conventional urea, CRU and DCRU decreased GHGI. Meanwhile, GHGI was found to decrease by CRU in the previous study [ 10 ]. Therefore, the trade-offs between crop yields and GHG emissions in vegetable fields could be obtained by controlled-release fertilizer combined with DCD.…”

Section: Discussionmentioning

confidence: 80%

“…GHG emissions from croplands depend on both environmental variations associated with climate and soil type and agricultural management such as tillage, fertilization and irrigation [ 6 , 7 ]. The excessive use of nitrogen (N) fertilizer has improved crop yields [ 8 ], but has also become the largest contributor of GHGs from farmland, accounting for more than 25% of total global N 2 O emissions [ 9 , 10 ]. Hence, there exists an urgent need to develop optimized N fertilization strategies that can mitigate GHG emissions without detrimental impacts on crop yields [ 5 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have suggested that controlled-release urea (CRU), a newly developed long-acting N fertilizer, could be adopted as an optimal N management practice to improve N use efficiency (NUE), increase crop yields, and reduce GHG emissions. CRU can better match fertilizer nutrient release with crop uptake without additional topdressing [ 10 , 12 , 13 ]. Previous meta-analyses indicated that CRU could be applied once as basal fertilizer with no effect on grain yields while reducing reactive N losses by 49% worldwide [ 14 ], thus decreasing the use of N fertilizer and promoting time- and labor-saving crop production [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…Previous meta-analyses indicated that CRU could be applied once as basal fertilizer with no effect on grain yields while reducing reactive N losses by 49% worldwide [ 14 ], thus decreasing the use of N fertilizer and promoting time- and labor-saving crop production [ 15 , 16 ]. The advantageous effects of CRU on grain yield and NUE depend largely on the synchronization of the N release rate with the N requirements of crops [ 10 ]. The application of CRU slows down the release of available N through its physical coating, influences soil NH 4 + -N and NO 3 − -N content and C/N ratio [ 17 ], and alters the structure and activity of the soil microbial community [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Long-Term Controlled-Release Urea on Soil Greenhouse Gas Emissions in an Open-Field Lettuce System

Wang,

Cao,

Zhou

et al. 2024

Plants

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Controlled-release urea (CRU) fertilizers are widely used in agricultural production to reduce conventional nitrogen (N) fertilization-induced agricultural greenhouse gas emissions (GHGs) and improve N use efficiency (NUE). However, the long-term effects of different CRU fertilizers on GHGs and crop yields in vegetable fields remain relatively unexplored. This study investigated the variations in GHG emissions at four growth stages of lettuce in the spring and autumn seasons based on a five-year field experiment in the North China Plain. Four treatments were setup: CK (without N application), U (conventional urea—N application), ON (20% reduction in urea—N application), CRU (20% reduction in polyurethane-coated urea without topdressing), and DCRU (20% reduction in polyurethane-coated urea containing dicyandiamide [DCD] without topdressing). The results show that N application treatments significantly increased the GHG emissions and the lettuce yield and net yield, and DCRU exhibited the lowest N2O and CO2 emissions, the highest lettuce yield and net yield, and the highest lettuce N content of the N application treatments. When compared to U, the N2O emission peak under CRU and DCRU treatments was notably decreased and delayed, and their average N2O emission fluxes were significantly reduced by 10.20–20.72% and 17.51–29.35%, respectively, leading to a significant reduction in mean cumulative N2O emissions during the 2017–2021 period. When compared to U, the CO2 fluxes of DCRU significantly decreased by 8.0–16.54% in the seedling period, and mean cumulative CO2 emission decreased by 9.28%. Moreover, compared to U, the global warming potential (GWP) and greenhouse gas intensity (GHGI) of the DCRU treatment was significantly alleviated by 9.02–17.13% and 16.68–20.36%, respectively. Compared to U, the N content of lettuce under DCRU was significantly increased by 6.48–17.25%, and the lettuce net yield was also significantly increased by 5.41–7.71%. These observations indicated that the simple and efficient N management strategy to strike a balance between enhancing lettuce yields and reduce GHG emissions in open-field lettuce fields could be obtained by applying controlled-release urea containing DCD without topdressing.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 80%