›› 2019, Vol. 31 ›› Issue (12): 2073-2083.DOI: 10.3969/j.issn.1004-1524.2019.12.17

• Environmental Science • Previous Articles     Next Articles

Spatio-temporal characteristics of ingredients contents of organic fertilizers in Zhejiang

SHEN Yue1, MA Wanzhu2, DENG Xunfei2, CHEN Sili1, LU Ruohui1,*   

  1. 1. Administration Station of Cultivated Land Quality and Fertilizer of Zhejiang Province, Hangzhou 310029, China;
    2. Institute of Digital Agriculture, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2019-07-08 Online:2019-12-25 Published:2019-12-25

Abstract: In order to reveal the spatio-temporal characteristics of main quality-related ingredients of regional organic fertilizers, the raw materials, pH value, and contents of heavy metals, organic matter, total nutrients and water were determined based on investigation from 2008 to 2017 in Zhejiang Province. It was shown that the average contents of arsenic (As), cadmium (Cd), lead (Pb), chromium (Cr), and mercury (Hg) in the investigated organic fertilizers were 7.74, 1.84, 29.14, 100.76, and 0.34 mg·kg-1, respectively. The average contents of total nutrients (N+P2O5+K2O), organic matter, water content, and pH were 8.39%, 58.16%, 17.07% and 7.76, respectively. Besides, the high spatial variability was observed for contents of heavy metals in the investigated organic fertilizers. The high average contents of Hg, Cr, As, Cd, and Pb were respectively observed in Hangzhou, Wenzhou, Shaoxing/Jiaxing, Lishui/Jinhua, and Huzhou. The contents of heavy metals in the investigated organic fertilizers declined in the past 10 years. The average content of As decreased across all the cities, and Hg and Pb contents also decreased in most areas. Among all the raw materials of the investigated organic fertilizers, the highest As content was found in pig dung with 36.1% samples beyond the maximum limits set in NY 525-2012, as well as the Pb, Cr and Cd contents in more than 20% sample in sludge were beyond the maximum limits. In contrast, the food remnants were clean for heavy metal pollution. The differences of raw materials composition and the average heavy metals contents in raw materials were responsible for spatial variations of organic fertilizers.

Key words: organic fertilizer, spatio-temporal variability, raw materials, heavy metals, trend

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