Resources Science ›› 2021, Vol. 43 ›› Issue (2): 403-411.doi: 10.18402/resci.2021.02.17

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Quantity of available nutrient in livestock manure and its potential of replacing chemical fertilizers in China

SHI Xiaoxiao1,2(), ZHENG Guodi1,2(), GAO Ding1,2, CHEN Tongbin1,2   

  1. 1. Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-12-23 Revised:2020-03-23 Online:2021-02-25 Published:2021-04-25
  • Contact: ZHENG Guodi E-mail:17s@igsnrr.ac.cn;zhenggd@igsnrr.ac.cn

Abstract:

Quantifying the total amount and nutrient contents of livestock manure and calculating their substitution potential for chemical fertilizers are of great significance for achieving zero growth in fertilizer use. This study focused on the manure from cows, horses, donkeys, mules, pigs, sheep, poultry, and rabbits. The amount and the nutrient contents of livestock manure from 1980 to 2016 were estimated using the excretion coefficient method. The potential of livestock manure replacing chemical fertilizers was calculated according to the annual amount of chemical fertilizers applied and the amount of livestock manure that had been used. The results indicate that: (1) The amount and the nutrients of livestock manure showed a rapid growth trend then stabilized from 1980 to 2016. The manure resource and the total nutrients were 2.38×109 t and 4.71×107 t in 2016, and they had increased 45.7% and 49.8% from 1980 to 2016, respectively. (2) The total amount of chemical fertilizers applied in agriculture is 5.98×107 t in 2016. At present, the utilization rate of livestock manure is 60% in China. If the utilization rate of livestock manure increases to 75%, the consumption of chemical fertilizers can be reduced by 3.7% for nitrogen, 17.5% for phosphate, and 44.2% for potassium, respectively. The results showed that the potential of replacing chemical fertilizers is more valuable reference as it consider the current utilization of livestock and poultry manure. (3) The utilization rate of manure needs to be further improved under the conditions of farming and livestock and poultry farming are separated, pollutant loading to agricultural land. In order to achieve the utilization rate of livestock and poultry manure improved and zero growth in fertilizer, some measures should be taken such as optimizing the distribution of animal husbandry, rationally planning the amount of livestock and returning poultry manure to the field.

Key words: livestock manure, nutrient, resource amount, organic fertilizer, potential of replacing chemical fertilizers, resource utilization