Significant effect of Cu addition was presented in 6 among 11 soil samples. No distinct effects of B,Moor Zn addition wo showed. As for Fe and Mn,the application of theirs did not show marked effects because they were sufficient in these soils.

• 微量元素要注意施用钢,11个样本中有6个效应显著,这类土壤施用硼、钼,锌效果一般,需要量多的作物可以考虑,至于铁、锰,这类土壤本身不缺乏,施用投有效果。