The indices calculated from the Diagnosis and Recommendation Integrated System (DRIS) are used to interpret previously published data on the variation in N, P, K, Ca and Mg content in corn leaves. The results indicate that the DRIS approach is able to make consistent diagnoses of the order of requirement of the above elements by the plant irrespective of position of the leaf on the plant and portion of leaf sampled within certain limits. The diagnoses are completely consistent if any whole leaf from the middle of the plant is sampled.