Research was made on some indices of soil in Northwest Guangxi.The soil indexes include soil organic matter,total Zn,Mn,Cu,Fe,Ca,Mg,available Zn,Cu,Fe,and exchangeable Ca,Mg,pH etc.Soil samples include 126 topsoils,which were corrected in the citrus demonstration area of environmentat immigrants.The status of second and trace etement contents in the soil of citrus orchard were studied.The result showed that total Zn,Mn,Cu content was low,and total Ca,Mg content was seriously deficient,and however total Fe content was superfluous. Exchangeable m...