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, CaCO3equivalent, 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.