Evaluation of heavy metal contents of apple orchard soil in the major apple production area of Shaanxi

The contents of soil heavy metals of apple orchards were monitored and analyzed on 47 soil samples in apple orchards of 16 counties of Shaanxi.The result of test showed that the detection rates of Cd,Cr,Cu,Pb,Hg and As were 100%,but the amounts were all below the permitted level of no-harmful apple producing environmental standard;according to the permitted level of green apple producing environmental standard,the values of the singleitem pollution index of the soil heavy metals were all smaller than 1 except one soil sample As,whose index was 1.03.For 47 soil samples,the values of comprehensive index were all smaller than 0.56,belonging to clean grade.As is the focal point to be monitored and controlled from now on.