Spatial Planning Needed to Drastically Reduce Nitrogen and Phosphorus Surpluses in China’s Agriculture

Jin, X., Bai, Z., Oenema, O., Winiwarter, W. ORCID:, Velthof, G., Chen, X., & Ma, L. (2020). Spatial Planning Needed to Drastically Reduce Nitrogen and Phosphorus Surpluses in China’s Agriculture. Environmental Science & Technology 54 (19) 11894-11904. 10.1021/acs.est.0c00781.

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China's fertilization practices contribute greatly to the global biogeochemical nitrogen (N) and phosphorus (P) flows, which have exceeded the safe-operating space. Here, we quantified the potentials of improved nutrient management in the food chain and spatial planning of livestock farms on nutrient use efficiency and losses in China, using a nutrient flow model and detailed information on >2300 counties. Annual fertilizer use could be reduced by 26 Tg N and 6.4 Tg P following improved nutrient management. This reduction N and P fertilizer use would contribute 30% and 80% of the required global reduction, needed to keep the biogeochemical N and P flows within the planetary boundary. However, there are various barriers to make this happen. A major barrier is the transportation cost due to the uneven distributions of crop land, livestock, and people within the country. The amounts of N and P in wastes and residues are larger than the N and P demand of the crops grown in 30% and 50% of the counties, respectively. We argue that a drastic increase in the recycling and utilization of N and P from wastes and residues can only happen following relocation of livestock farms to areas with sufficient cropland.

Item Type: Article
Uncontrolled Keywords: Food,Soils,Wastes,Livestock,Crops
Research Programs: Air Quality & Greenhouse Gases (AIR)
Depositing User: Luke Kirwan
Date Deposited: 27 Oct 2020 08:35
Last Modified: 26 Oct 2021 03:00

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