Total soil zinc,available zinc and other soil properties were measured to determine their distribution and to identify factors affecting their variability in different regions of the Loess Plateau.Results showed that total soil zinc was mostly within the range 50~100 mg·kg-1.For available zinc,20.7% of the soil samples was lower than the critical value(0.5 mg·kg-1) and 37.9% beneath the low level(0.5~1 mg·kg-1).Power functions,linear and exponential regression equations were established to study the relatio...
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