Effect of Organic Cattle Manure and Chemical Fertilizer Application on Heavy Metal Morphology in Soil
The purpose of the study was to alleviate the contradiction between the increase of livestock production capacity and the increasingly serious pollution of livestock manure,to explore the potential of fertilizer utilization of livestock manure and avoid the potential heavy metal hazards to the environment caused by excessive application.The experiment used organic fertilizer made of cow dung as the research object for pot experiment,and five treatments were set up according to different proportions of organic fer-tilizer made of cow manure and chemical fertilizer application,and the mass fraction of each form of heavy metal Cu and Zn in the soil of different treatments after harvesting was determined,the determination of soil organic carbon and pH value was also performed.The results showed that the distribution of cow dung organic fertilizer could reduce the total mass fraction of heavy metals Cu and Zn in the soil,and the DF1 treatment had the greatest reduction,which was 25.54％and 39.20％,respectively,compared with the CK treatment.Meanwhile,it promoted the transformation of residue state to exchangeable state,the distribu-tion rate of the exchangeable state Cu in DF1 and DF2 treatments increased form 15.86％to 28.13％and 42.02％,respectively,compared with CK treatment,and DF2 treatment had the greatest increase on the distribution rate.Zn distribution rate of residue state was reduced to 39.27％and 38.40％,respectively,in CD and DF1 treatments,compared with CK treatment.The change in DF2 treatment was the greatest,from 53.40％to 24.33％.After the application of cow dung organic fertilizer,the soil pH and organic car-bon content had a tendency to increase,in which the soil organic carbon was positively correlated with the trend of the allocation rate of the effective state of Cu and Zn in the soil,and the correlation was significant(P＜0.05),while the positive correlation between the soil effective state of Zn and the trend of the soil pH was significant(P＜0.05),but the correlation of the effective state of the heavy metal Cu and the pH was not significant(P＞0.05).To sum up,the application of organic fertilizer made of cattle manure should strictly follow the actual demand calculated by soil testing formula to avoid excessive application which in-creases the risk of heavy metal pollution in the soil environment.
organic fertilizer made of cattle manurefertilizercombined applicationcopperzinc
万方数据
维普
