Abstract
Abstract Zinc of index corn leaves samples from 91 Minnesota sites on numerous soil types was correlated with soil Zn extracted by four routine procedures. The EDTA•(NH4)2CO3 ‐ extractable soil Zn was more closely correlated with leaf Zn than soil zinc extracted by 0.1N HCl, EDTA‐NH4OAc, or by NH4OAc ‐ dithizone. Soil pH, CaCO3 equivalent, extractable P, and organic matter of both acid and calcareous soils were negatively correlated with leaf Zn. When EDTA • (NH4)2CO3 ‐ extractable Zn was included with routine soil tests, a prediction equation for corn leaf Zn was formulated and compared with analytical values. However, the use of 1.4 ppm EDTA • (NH3)2CO3, ‐ extractable soil Zn alone as a critical value was equally effective in predicting leaf Zn.
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