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Abstract
The DRIS (Diagnosis and Recommendation Integrated System) and DOP (Deviation from Optimum Percentage) were applied to interpret the nutritional state of the peach tree (Prunus persica L. Batsch) at different times during its vegetative cycle. The DRIS system which uses nutritional relationships in the form of ratios, only establish a correct order of the nutritional elements [nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg)] considered when the corresponding reference values and coefficients of variation during the sampling season were used, and thus appears to be time dependant. The DRIS system that uses nutritional relationships in the form of products did not establish a correct order of limitations for the considered elements. The interpretations obtained by the DOP system coincided with that of DRIS and also provided more valuable and extensive information that is easily applied and interpreted by computer.