Abstract
Tissue diagnostic norms for Valencia orange (Citrus sinensis L. Osbeck) were developed by searching for, detecting, and sampling the most productive individuals of this crop, using a survey approach. The study involved trees of different ages, grafted on different rootstocks in several plantations, located in the most important orange producing areas (four states) of Venezuela. Data for 214 leaf samples, corresponding to the top 20% of the trees sampled, were used to develop the norms. Norms developed were compared for validation against previously published sufficiency range values and other published orange Diagnosis and Recommendation Integrated System (DRIS) norms. The close general agreement among the published values and the norms developed here, suggests that this approach could become an economic, relatively fast and reliable method for developing tissue diagnostic norms.
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