Determining effect of fertilization on reactive nitrogen losses through nitrate leaching and key influencing factors in Chinese agricultural systems

Shenglin Wen, Ningbo Cui, Yaosheng Wang, Daozhi Gong, Liwen Xing, Zongjun Wu, Yixuan Zhang and Zhihui Wang

Agricultural Water Management, 2024, vol. 303, issue C

Abstract: Nitrate leaching is the main pathway of reactive nitrogen loss in Chinese agricultural systems, leading to groundwater contamination. However, the effect of fertilization on reactive nitrogen losses through nitrate leaching under various natural conditions and key influencing factors in Chinese agricultural systems remains unclear. Therefore, we conducted a comprehensive meta-analysis of 394 observations from 50 published articles to investigate how management practices, climatic conditions, and soil properties influence nitrate leaching from upland and paddy fields in China. Our results showed that nitrogen fertilizer application (NFP) significantly increased nitrate leaching in paddy and upland fields, with paddy fields exhibiting lower nitrate leaching than upland fields. In paddy fields, soil pH and NFP timing were the main drivers of nitrate leaching, while in upland fields, NFP rate and pH were the main driving factors. The NFP rate showed a significant positive correlation with nitrate leaching in both upland and paddy fields. Combining chemical fertilizer and organic manure applications was the effective method for mitigating nitrate leaching in paddy and upland fields. The structural equation modeling (SEM) revealed significant effects of soil properties on the nitrate leaching in paddy and upland fields during the crop growing season (P<0.05), with standard path coefficients of −0.46 and 0.07, respectively. NFP in soil with organic matter (SOM) ≥30 g kg−1 and total nitrogen (TN) of 1–2 g kg−1 declined the risk of nitrate leaching in paddy and upland fields. Additionally, NFP in regions with mean annual air temperature (MAT) >15 ℃ helped mitigate the risk of nitrate leaching. Our findings provide valuable guidance for optimizing NFP in agricultural production to improve nitrogen use efficiency and reduce groundwater pollution.

Keywords: Climate conditions; Soil properties; Structural equation modeling; Driving factors; Meta-analysis (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0378377424003901
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:303:y:2024:i:c:s0378377424003901

DOI: 10.1016/j.agwat.2024.109055

Access Statistics for this article

Agricultural Water Management is currently edited by B.E. Clothier, W. Dierickx, J. Oster and D. Wichelns

More articles in Agricultural Water Management from Elsevier
Bibliographic data for series maintained by Catherine Liu ().