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Article
2021
Estimation of the P fertilizer demand of China using the LePA model
Estimation of the P fertilizer demand of China using the LePA model
Yu, Wenjia Li, Haigang Nkebiwe, Peteh Mehdi Li, Guohua Müller, Torsten Zhang, Junling Shen, Jianbo
Abstract (English)
Modern phosphate (P) fertilizers are sourced from P rock reserves, a finite and dwindling resource. Globally, China is the largest producer and consumer of P fertilizer and will deplete its domestic reserves within 80 years. It is necessary to avoid excess P input in agriculture through estimating P demand. We used the legacy P assessment model (LePA) to estimate P demand based on soil P management at the county, regional, and country scales according to six P application rate scenarios: (1) rate in 2012 maintained; (2) current rate maintained in low-P counties and P input stopped in high-P counties until critical Olsen-P level (CP) is reached, after which rate equals P-removal; (3) rate decreased to 1–1.5 kg ha−1 year−1 in low-P counties after CP is reached and in high-P counties; (4) rate in each county decreased to 1–8 kg ha−1 year−1 after soil Olsen-P reached CP in low P counties; (5) rate in each county was kept at P-removal rate after reduction; (6) P input was kept at the rate lower than P-offtake rate after reduction. The results showed that the total P fertilizer demand of China was 750 MT P2O5, 54% of P fertilizer can be saved from 2013 to 2080 in China, and soil Olsen-P of all counties can satisfy the demand for high crop yields. The greatest potential to decrease P input was in Yangtze Plain and South China, which reached 60%. Our results provide a firm basis to analyze the depletion of P reserves in other countries.
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Frontiers in environmental science, 9 (2021), 759984.
https://doi.org/10.3389/fenvs.2021.759984.
ISSN: 2296-665X
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Yu, W., Li, H., Nkebiwe, P. M., Li, G., Müller, T., Zhang, J., & Shen, J. (2021). Estimation of the P fertilizer demand of China using the LePA model. Frontiers in environmental science, 9. https://doi.org/10.3389/fenvs.2021.759984
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630 Agriculture
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Free keywords
Legacy soil P LePA model Soil P management P demand China
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Sustainable Development Goals
BibTeX
@article{Yu2021,
url = {https://hohpublica.uni-hohenheim.de/handle/123456789/16880},
doi = {10.3389/fenvs.2021.759984},
author = {Yu, Wenjia and Li, Haigang and Nkebiwe, Peteh Mehdi et al.},
title = {Estimation of the P Fertilizer Demand of China Using the LePA Model},
journal = {Frontiers in environmental science},
year = {2021},
}