Grade of soil nutrients and their correlation with organic matter in apple orchards in Luochuan

In Luochuan County,Shaanxi province where was a suitable growing area of apple,different orchards were chosen to analyze the grade of soil organic matter,total N,total P,total K,available nutrients and trace elements.The results showed that the levels of soil organic matter,total N and available N were low;the coefficient of variation(CV)of soil available Pwas high,and itwas accumulated in some orhards;the content of soil available K was high.The content of trace elements such as Fe,Mn,Cu and Zn was low,in which the shoratge of Zn was most remarkable,and the CV of soil available Cuwas relatively high.The soil organic matterwasvery significantly correlatedwith total N,available N and available P,andwas significantly correlated with available Fe and Zn,butwas not significantly correlated with available Cu and Mn.The yield of orchards increased with the increase of soil organic matter content.