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Journal of Agriculture ›› 2016, Vol. 6 ›› Issue (4): 30-35.doi: 10.11923/j.issn.2095-4050.cjas15120006

Special Issue: 土壤重金属污染 畜牧兽医 园艺

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Long-term Application of Pig Manure Compost Affecting Heavy Metal Accumulation in Vegetable-soil System

  

  • Received:2015-12-10 Revised:2016-01-14 Accepted:2016-01-22 Online:2016-04-20 Published:2016-04-20

Abstract: In order to understand the effects of long-term application of the intensive livestock and poultry farms-source compost on heavy metals accumulated in vegetable-soil system, a three year-field experiment was conducted. The experiment included four treatments, ie., control (chemical fertilizers), 1/2 pig manure-source compost and 1/2chemical fertilizers, pig manure-source compost, and double quantity of pig manure-source compost. The results showed that application of pig manure-source compost could prevent soil from acidification, and improve soil fertility levels. However, the experiment also showed that pig manure source compost could significantly increase the accumulation of heavy metals in soil and vegetables when it alone was used as fertilizer to vegetable field, although the applied pig manure compost met the requirement of industry standards for organic fertilizer in China (NY525-2012). The contents of heavy metals in the soil and vegetable increased with increasing amount of pig manure compost and application time. After 3 years of continuous application of pig manure compost, the contents of Cd, Zn and Cu in soil were increased by 31.2%, 27.3% and 14%, respectively. And the contents of Cd, Zn, Pb and Cu in vegetables were significantly higher than that in the treatment of chemical fertilizer. After 3 years of continuous application of double quantity of pig manure compost, the contents of Cu、Zn、Pb、Cd、Hg and As in soil were increased by 67.4%, 53.0%, 13.1%, 24.4%, 25.9% and 13.8%, respectively. And the contents of Cu, Zn, Pb, Cd, Hg and As in vegetables were significantly higher than that in the treatment of chemical fertilizer. But there were no significant difference in heavy metals of vegetable products between the combined application of chemical fertilizer plus pig manure compost (1/2 pig manure-source compost and 1/2chemical fertilizers) and chemical fertilizer treatment. The combined application of chemical fertilizer plus pig manure compost was suitable fertilization model for the promotion of vegetable field. It is suggested that the application amount of rich Cu and Zn pig manure in the vegetable fields should be controlled, continuous application of pig manure in vegetable field should be avoided.