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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
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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@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},
}