Author
Listed:
- Zhou, Weiwei
- Wang, Qunyan
- Chen, Shuo
- Chen, Fei
- Lv, Haofeng
- Li, Junliang
- Chen, Qing
- Zhou, Jianbin
- Liang, Bin
Abstract
Soil pH is important for influencing soil properties. High input of nitrogen (N) fertilizers and irrigation water has accelerated the soil acidification in plastic-shed greenhouses. However, little is known about the dynamics of soil pH buffering system, especially the base cations, and its response mechanisms under different N management practices. In this study, we investigated the responses of soil Ca2+ and Mg2+ leaching loss to nitrate leaching under different N application rate, N forms, or straw addition. Our long-term experiment in typical greenhouses showed that N application significantly decreased soil pH and increased Ca2+ and Mg2+ leaching loss by 43.1–73.6%, which correlated significantly and positively with nitrate leaching loss. However, optimizing N application and straw incorporation alleviated the leaching loss of Ca2+ and Mg2+ not only by alleviating the accompanying nitrate leaching caused by reduced N input, but also by reducing the conversion of exchangeable Ca2+ and Mg2+ to water-soluble Ca2+ and Mg2+ caused by alleviating soil pH reduction. The laboratory microcosm experiment showed that nitrate application did not reduce soil pH, but significantly increased the leaching loss of Ca2+ and Mg2+. Ammonium sulfate application also significantly increased the leaching loss of Ca2+ and Mg2+, whereas the effects were significantly reversed by nitrification inhibitors. These results further supported the importance of nitrate leaching in promoting the Ca2+ and Mg2+ losses. Together, this study revealed new insights into the dynamics of cation losses mainly regulated by nitrate leaching loss, highlighting that optimizing N management is an effective strategy to alleviate base cation losses and subsequent soil acidification for sustainable agricultural management.
Suggested Citation
Zhou, Weiwei & Wang, Qunyan & Chen, Shuo & Chen, Fei & Lv, Haofeng & Li, Junliang & Chen, Qing & Zhou, Jianbin & Liang, Bin, 2024.
"Nitrate leaching is the main driving factor of soil calcium and magnesium leaching loss in intensive plastic-shed vegetable production systems,"
Agricultural Water Management, Elsevier, vol. 293(C).
Handle:
RePEc:eee:agiwat:v:293:y:2024:i:c:s037837742400043x
DOI: 10.1016/j.agwat.2024.108708
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