Evaluation of pollution-free Myrica rubra production in Zhejiang Province

Soil condition(pesticide residue and heavy metals concentration) and heavy metals concentration in Myrica rubra(China bayberry) fruits were analyzed by atomic absorption spectrophotometer PE-5000 and atomic fluorescence spectrophotometer AFS-1201 to understand the actual production of pollution-free Myrica rubra fruits.35 soil samples collected in Cixi,Huangyan,Wenzhou,Yuyao,Linhai,Xianju,Wencheng and Shangyu of Zhejiang Province,and the fruit samples were collected Ninghai,Yueqing,Xiaoshan,Lanxi of Zhejiang Province except of the above plots,including two batches.Most sample spots were at the side of a town industry region and highways.The pollution index equals to determined value divided by limited value.Results showed that in the soil,pesticide residue was undetected with six heavy-metals(Cd,Pb,As,Cr,Hg,and Cu) being discovered in most production regions.Average content of the heavy-metal in the soil was ranked in the order of Pb Cr As Cu Cd Hg,while the pollution index was Cd Cr Pb As Hg Cu.The percentage of 97.14% of the samples in the production regions met the pollution-free soil quality standard.However,in all of the fruit samples,Cd, As,and Cu were detected;in most Pb was found;and in two-thirds Hg was present.In the research,94.12% and 90.70% of the two batch samples accorded with the national fruit standard.The maximum heavymetal in the soil samples that was above the standards was Cd followed by Pb.Planting site avoided pollution,normative fertilization and pesticide applications were necessary in the production of pollution-free M.rubra fruits.