2012•Nongye huanjing kexue xuebaoRequires access
Influence of Swine Compost Application on the Soybean Planting and Its Environmental Risk Assessment
Zengqiang Zhang
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Abstract
In order to study the effect of compost application on soybean planting in a typical zinc lack soil which was collected from Yangmazhuang,Yongshou County,Shaanxi Province.High zinc contained swine manure was selected as the raw materials and the corn stalk powder as the amendment,the mixture was composted for 90 days in an aerobic reactor.The effects of different amount of compost on growth and development,yield and quality of soybean through pot cultivating experiment were studied.The results showed that after 90 days composting,the final organic fertilizer contained plenty of N,P,K,as well as Cu 256.3 mg.kg-1 and Zn 474.4 mg.kg-1,respectively,the elements such as Ni,Cd,Cr,Pb,Hg and As were out of determination.The organic fertilizer had significant effect on the soybean seed yield,stem and root growth,as well as seeds Zn content increase.And the seed,stem and root weight reached the maximum amount with the compost ratio increased to 10%,and compared with the control treatment,soybean seed weight,root weight and stem(including pod shell)increased 206.7%,94.2% and 94.0%,respectively.Zn content in seed increased with the amount of compost added,and was as high as 49.33 mg.kg-1 in 40% compost ratio.Along with the increase of the proportion of compost,soil EC,total Zn and Cu,available Zn and Cu content increased rapidly,while the soil pH gradually declined from 8.46 to 7.44.The further single pollution index and geoaccumulation index evaluation results indicated that it would not cause the typical zinc lack soil environmental risk with the compost rational application rate of 5%.And the compost rational application rate in Yongshou zinc lack soil was 90.28 t.hm-2.a-1 which could be used for 20 years.The study implicated that the high zinc content swine manure compost had a potential agricultural application value in the zinc lack soil,and it had a positive effect on the soybean planting with the compost rational application rate of 5%.