Response of area‐ and yield‐scaled N2O emissions from croplands to deep fertilization: a meta‐analysis of soil, climate, and management factors. (12th February 2021)

• Record Type: Journal Article
• Authors: Chen, Hui; Liao, Qingxi; Liao, Yitao
• Is Part Of: Journal of the science of food and agriculture. Volume 101:Number 11(2021)
• Page Start: 4653
• Page End: 4661
• Publication Date: 2021-02-12
• Subjects: N2O emissions -- N2O intensity -- deep fertilization -- meta‐analysis; Food -- Periodicals; Agriculture -- Periodicals; 664
• DOI: 10.1002/jsfa.11108
• Languages: English
• ISSNs: 0022-5142

Abstract

Abstract: BACKGROUND: Nitrous oxide (N2 O) is an important and persistent greenhouse gas making a significant contribution to global climate change. Deep fertilization has been demonstrated to increase crop yield and nutrient use efficiency by decreasing losses of volatilization and surface runoff. However, N2 O emissions from croplands induced by deep fertilization are variable and mitigation strategies remain uncertain. This study aimed to (i) quantify the response of area‐scaled (N2 O emissions) and yield‐scaled N2 O emissions (N2 O intensity) from croplands to deep fertilization, and (ii) identify the soil, climate, and management factors that mitigate N2 O emissions and N2 O intensity under deep fertilization. RESULTS: Compared with the control, deep fertilization increased N2 O emissions by 18.6% ( P < 0.001) but decreased N2 O intensity by 20.1% ( P = 0.018). By adopting deep fertilization, N2 O emissions could be significantly mitigated in rice‐paddies soils (−48.8%), with fertilizer depth > 10 cm (−33.0%), and with fertilizer N amount > 200 kg N ha −1 (−8.2%). N2 O intensity following deep fertilization significantly decreased in soils with pH ≤6 (−22.5%), at sites with precipitation of 500–1000 mm (−25.5%), in rice‐paddies soils (−53.0%), with the method of mixed fertilizer in the control (−21.2%), and with fertilizer depth > 10 cm (−33.6%). CONCLUSION: This study provides a basis for assessing the effect of deep fertilization on N2 O emissions and provides potential measures to mitigate N2 O emissions associated with deep fertilization practices.