Journal
REVISTA BRASILEIRA DE CIENCIA DO SOLO
Volume 36, Issue 2, Pages 437-445Publisher
SOC BRASILEIRA DE CIENCIA DO SOLO
DOI: 10.1590/S0100-06832012000200013
Keywords
modeling; nutritional status; DRIS
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Leaf analysis is the chemical evaluation of the nutritional status where the nutrient concentrations found in the tissue reflect the nutritional status of the plants. Thus, a correct interpretation of the results of leaf analysis is fundamental for an effective use of this tool. The purpose of this study was to propose and compare the method of Fertilization Response Likelihood (FRL) for interpretation of leaf analysis with that of the Diagnosis and Recommendation Integrated System (DRIS). The database consisted of 157 analyses of the N, P, K, Ca, Mg, S, Cu, Fe, Mn, Zn, and B concentrations in coffee leaves, which were divided into two groups: low yield (<30 bags ha(-1)) and high yield (>= 30 bags ha(-1)). The DRIS indices were calculated using the method proposed by Jones (1981). The fertilization response likelihood was computed based on the approximation of normal distribution. It was found that the Fertilization Response Likelihood (FRL) allowed an evaluation of the nutritional status of coffee trees, coinciding with the DRIS-based diagnoses in 84.96 % of the crops.
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