Preliminary NPK foliar diagnostic norms for wheat

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Abstract
Foliar diagnostic norms for NPK in wheat leaves derived using Beaufils’ Diagnosis and Recommendation Integrated System (DRIS) are presented. These norms were calculated from published and unpublished data of various workers who presented leaf composition with corresponding yields. The preliminary norms appear to be applicable to wheat irrespective of variety and age at which the leaf sample is taken. These norms are able to correctly diagnose the requirements of the crop more often than those based on the critical or sufficiency level approach.