Effects of organic manure from animal carcasses on Brassiacampestris L.growth and soil heavy metal accumulation

ZHAI Zhen;XIONG Bo;ZHANG Li;JIANG Bin;LI Chuan-you;PANG Huan-cheng;LI Yu-yi;Institute of Natural Resources and Regional Planning Chinese Academy of Agricultural Sciences;Beijing Agricultural Machinery Testing Extension Station;

harmlessly treated animal carcass manure;;soil fertilization;;Brassiacampestris L;;heavy metal;;accumulation

A pot experiment was conducted to explore the feasibility of applying harmlessly-treated animal carcass manure from livestock and poultry farms to vegetable cultivation.The growth of Brassiacampestris L.and soil heavy metal content were measured under three dif-ferent treatments,including chemical fertilizer(NPK)only,combined chemical fertilizer plus manure(NPK+M),and combined chemical fertilizer plus double manure(NPK + 2M).Results showed that both NPK + M and NPK + 2M significantly increased shoot dry weight by50.53%~221.05%,compared with NPK(P<0.05).In NPK+2M treatment,relative chlorophyll content(SPAD)in fresh leaves and leaf net photosynthetic rate significantly increased by 22.85% and 21.98%,respectively,as compared with NPK treatment(P<0.05).Activities of superoxide dismutase(SOD),catalase(CAT),and peroxidase(POD)were found to be the highest,meanwhile maloaldehyde(MDA)was lowest in NPK+2M treatment.Compared with NPK,both NPK+M and NPK+2M increased soil Cr,Cu,Cd and Pb concentrations,but Cu and Pb content was not different between NPK+2M and NPK treatment(P<0.05).However,the content of heavy metals in NPK+2M was far lower than the class II limits of the soil environment quality standards.In addition,the heavy metal content in Brassiacampestris L.aboveground and belowground parts in NPK+2M showed no significant increases,compared to NPK treatment(P>0.05),and the Cr,Cd and Pb content in the aboveground part was much lower than the National Food Standards for vegetables.These results would shed light on the safe use of harmlessly-treated animal carcasses.