›› 2020, Vol. 32 ›› Issue (2): 299-307.DOI: 10.3969/j.issn.1004-1524.2020.02.14

• Environmental Science • Previous Articles     Next Articles

Quality risk assessment and management of manure based organic fertilizers in Zhejiang

NI Zhihua1, SUN Wanchun2, LIN Hui2, ZHONG Hang1, ZHU Weifeng1, LU Ruohui1, MA Junwei2   

  1. 1. Zhejiang Cultivated Land Quality and Fertilizer Management Station, Hangzhou 310020, China;
    2. Institute of Environment, Resource, Soil & Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2019-10-28 Online:2020-02-25 Published:2020-03-13

Abstract: In this work, more than 1 000 samples, which included commercial organic fertilizer, farmyard manure compost and raw manure, were collected from Zhejiang Provinces over years. The basic physiochemical properties as well as the contents of nutrients, heavy metals, antibiotics and mineral salts were determined to investigate the quality status and potential risks of commercial manure based organic fertilizers in Zhejiang. It was shown that the average qualification rate of the commercial organic fertilizers collected from 2014 to 2016 was 72.5% according to the national standard of organic fertilizer NY 525—2012 in China, which showed an increasing trend year by year. Heavy metals contents exceeding the standard limit was the main reason for the disqualification of these organic fertilizers. Heavy metals, including As, Cd, Pb, Cr and Hg exceeding the standard limit were found in the samples of this work. The average over standard rate of heavy metals in pig manure based organic fertilizers was higher than that of other organic fertilizers. The heavy metal pollution in the commercial organic fertilizers mainly sourced from livestock manure. Tetracyclines, fluoroquinolones and sulfanilamides antibiotics were also frequently detected in the commercial organic fertilizer samples, and the highest concentration reached 71.0 mg·kg-1. The salt content in the manure of livestock and poultry could reach 26.1 g·kg-1. The reasons for the risk of the application of manure based organic fertilizers included the following aspects: the current organic fertilizer standard could not satisfy the actual situation; the current organic fertilizer standard could not be strictly implemented; feed additives failed to meet the requirement of the standard; etc. The strategies for the risk control and safety utilization of manure based organic fertilizers was further discussed, which included the scientific and standardized use of feed additives and the improved monitor management of the organic fertilizer production process and the product quality.

Key words: livestock and poultry manure, organic fertilizer, heavy metal, antibiotics

CLC Number: