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Impact of soil chemical properties on Cu uptake by plant and on soil available Cu testing

ChenTongbin (Institute of Geography, Academia Sinica, Bejiing 100101)  
A pot experiment with winter wheat (Triticum aestivum) and calcareous soils collected fromNorthern China Plain shows that there is no significant correlation between SB/D or AB/D extracted Cu and Cu uptake by wheat plant, indicating that these two extractants are unsuitablefor testing soil available Cu. But SB/D-extrated Cu is correlated with Cu uptake at level P0.01 and can be used to evaluate soil available Cu, when soil pH value and orgnic matter content are calibrated. The higher the soil pH value, the less the Cu uptake by wheat. The averagc soil available Cu is decreased 19μg per pot, when pH value is increased one unit. When thesoil pH value and the soil organic matter content are increased, the content of soil available Cu isdecreased and increased respectively.
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