Journal of Ecology and Rural Environment ›› 2017, Vol. 33 ›› Issue (4): 324-331.doi: 10.11934/j.issn.1673-4831.2017.04.005

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Nutrient Resources in Livestock Manure and Its Potential of Substituting Fertilizers: A Case Study of Guzhen County, Anhui Province

SUN Chao1,2,3,4, PAN Yu-chun1,2,3,4, LIU Yu1,2,3,4   

  1. 1. Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China;
    2. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China;
    3. Key Laboratory of Agri-Informatics, Ministry of Agriculture, Beijing 100097, China;
    4. Beijing Engineering Research Center of Agricultural Internet of Things, Beijing 100097, China
  • Received:2016-03-17 Online:2017-04-25 Published:2017-04-01

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Abstract:

Based on the status of the development of the crop farming and livestock rearing of Guzhen County, Anhui Province and comprehensive consideration of factors like planting structure, planting area and technology of livestock manure disposal, status of nutrient resources in livestock manure and their potential of substituting chemical fertilizer in the region was assessed. Results show that the manure excreted by the livestock in the county contained a total of 11 456.93 t of N and 2 954.09 t of P, far from adequate to meet the demand of the crops in the region for N and P in the case of no fertilizers applied and no crop straw incorporated. Scenario simulation shows that Scenario C where solid manure is collected and composted into organic manure as soon as possible, and liquid waste is pooled into biogas digesters and turned into biogas slurry for application into the crop fields, is the best model, providing 8 948.78 and 2 642.37 t of available N and P, which may meet the demand of the crops by 34% and 54%, respectively. The findings indicate that Guzhen has enough agricultural land to digest the livestock manure it produces, but it is essential to improve its manure treatment technology so as to increase the potential of livestock manure substituting chemical fertilizer. In Scenario C, the livestock manure may substitute 4 715.04 t of N fertilizer and 1 247.07 t of P fertilizer. Zhongxing, Renqiao, Liuji and Yangmiao townships are the highest in potential. All the findings may provide the decision-makers with theoretical support to make plans for developing scale of livestock raising and utilizing livestock manure.

Key words: livestock manure, fertilizer substitution potential, N(P) nutrient, Guzhen County

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