Contents of available microelements in cropping soil in Guangxi karst area and its evaluation

The typical cropping soil samples in Guangxi karst area were taken to study the microelement contents of available B,Zn,Cu,Fe,Mn,Mo in soil.The results showed that the content of available B,Zn,Cu,Fe,Mn,Mo were 0.18,1.30,2.35,49.20,32.94,0.10 mg/kg,respectively.Though the cropping soil in Guangxi karst area was abundance in Fe,Cu and Mn,it was seriously in lack of B and Mu,relatively or potentially in short of Zn.The contents of available B,Fe and Mn had a significant or very significant negative correlation with pH.The soil organic matter had a had a significant or very significant positive correlation with available Zn,B,Cu,Mn.The fertilizer with B,Mo,Zn and organic fertilizer should be more applied in agricultural production.