Effects of the Application of Pig Manure Organic Fertilizers on Soil Environment Quality

HUANG Xiaoyang; SHAO Jinsong; MA Yuntao

doi:10.15933/j.cnki.1004-3268.2017.11.011

Abstract：On the consideration of potential soil heavy metal pollution caused by the application of animal manure organic fertilizer,pig mature organic fertilizers were selected to investigate the effects on maize soil pH value,organic matter and the content of heavy metal through simulated field experiment.The results indicated that the contents of soil organic matter in treatments T11 [subscript numbers represented organic fertilizer types (1,2,3) and application amount(1 represented 1 875 kg/ha;2 represented 3 750 kg/ha),the same below],T12,T22,T31,and T32 increased in varying degrees from 5.34％ to 13.50％ compared with CK(no organic fertilizer was used),and it increased with the increment of organic manure,but that of treatment T21 was 19.36％ lower than CK.The change of soil pH value was not relatively consistent in all treatments compared with that of CK.Except Pb,the content of other heavy metals in shallow soil (0-40 cm) increased in varying degrees compared with that of CK.In the 0-10 cm layer of soil,the contents of Hg and As increased within the range of 0-232.70％ and 15.79％-238.35％ respectively;and the increase rates of Pb,Cu and Zn in the 0-20 cm layer of soil were 6.27％-32.41％,10.14％-34.39％ and 12.95％-45.85％ respectively,and the content of heavy metal Cr in the 0-40 cm layer increased by 14.03％-26.82％.The content of heavy metals in deep soil was significantly lower than that of CK.In the 90-100 cm layer of soil,the content of Pb decreased by 56.37％-71.01％;in terms of the content of Zn,the decreasing amplitude in the 60-70 cm layer was 10.51％-36.24％ and in the 90-100 cm layer was 27.71％-49.36％;as for the content of Cd,there was a decline of 29.36％-46.63％ in the 70-90 cm layer.The contents of soil heavy metals Cr,Pb,Hg and As significantly changed with the application of organic fertilizer,while the variation of Cu,Zn and Cd had no significant relation with it.It also showed that the kinds of organic fertilizer were related more obviously to the contents of Cr,As and Zn than that of Pb,Hg,Cu and Cd.The above study shows that there is stronger potential pollution risk on soil,especially shallow layers by using three kinds of organic fertilizers.