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| Research on the utilization of nutrients from rural toilet feces with the soil-crop system in Ningxia |
| Received:October 15, 2025 |
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| KeyWord:rural toilet feces;resource utilization potential;soil utilization;crop nutrient requirements |
| Author Name | Affiliation | E-mail | | LI Haipeng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300392, China | | | PENG Jinxing | College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300392, China | | | HUANG Zhiping | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Rural Toilets and Sewage Treatment Technology, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SHEN Feng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Rural Toilets and Sewage Treatment Technology, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Qiang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Rural Toilets and Sewage Treatment Technology, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | wq319320@126.com | | LIU Fang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Rural Toilets and Sewage Treatment Technology, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | liufangaepi@163.com |
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| Abstract: |
| In order to accurately evaluate the resource utilization potential of rural toilet feces in Ningxia Autonomous Region and its matching relationship with the regional crop nutrient demand, and to provide a scientific basis for regional nutrient cycle optimization and land carrying capacity regulation, this paper systematically measured the excretion of rural human manure（N, P, K）and the nutrient demand of crop manure in Ningxia based on the public statistics of the whole region（2021—2025）and the field sampling data of typical areas, and innovatively applied the human equivalent method to evaluate the land use adaptation intensity. The calculation results showed that the annual manure production and discharge of rural flushing toilets in Ningxia was 9 410 500-14 995 500 m3, and the solid manure production and discharge of dry toilets reached 365 100-601 400 t, which could provide 6 755.91-10 839.03, 415.65-673.68 t and 3 232.87-5 186.96 t of N, P and K nutrients, respectively. The demand for N and P of manure in regional crops was as high as 102 377.17 t and 16 854.32 t, and the substitution rates of N, P and K nutrients for chemical fertilizers were only 4.95%-7.94%, 1.03%-1.67% and 12.11% - 19.43%. The N and P bearing capacity of soil（141.98-227.89 person equivalents·hm-2·season-1 and 375.71-408.55 person equivalents·hm-2·season-1）significantly exceeded the recommended value of land use adaptation. The study revealed that the supply of human feces and urine in Ningxia was far from meeting the demand（especially N and P）. In order to achieving the sustainable development of agricultural system, it is feasible to establish an integrated management system for rural human waste and livestock manure, coupled with the implementation of precise nutrient management strategies to maximize their resource potential. |
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