02064naa a2200193 a 450000100080000000500110000800800410001910000220006024500740008226000090015652015360016565000170170165000110171865300200172965300090174965300280175870000180178677300660180415417912019-04-13       2007    bl uuuu     u00u1 u    #d1 aNACHTIGALL, G. R.  aTesting and validation of DRIS for apple tree.h[electronic resource]  c2007  aTo evaluate three procedures of the calculation of DRIS indices, as well as the efficiency of DRIS as a method for the interpretation of apple tree leaf analyses. This study uses data collected in apple producing areas of the Rio Grande do Sul and Santa Catarina States, Brazil. The concentrations of nitrogen, phosphorus, potassium, calcium, magnesium, boron, copper, iron, manganese, and zinc were determined in the leaf samples. The validation of the DRIS method used results of an experiment of potassium fertilization. The DRIS indices were calculated using two criteria for the choice of the ratio order of nutrients (F value ? ratio of variance of the relationships among nutrients between the reference group and the low productivity group, and R value - correlation coefficients between the productivity and the relationship between pairs of nutrients) and three forms of calculation of nutrient functions (methods of Beaufils, Jones and Elwali & Gascho). The Nutritional Balance Index (NBI) presented negative correlation with the productivity in all combinations. The DRIS method described by Elwali & Gascho, using the F value, presented a performance similar to the criterion of sufficiency range, and it can be used for the interpretation of foliar analysis of apple trees, because it presents values of the nutritional balance index that indicates the nutritional status of the plants, and for the efficiency in the nutritional diagnosis of the crop. Key words: Malus Domestica, foliar diagnosis, nutritional balance  aFruticultura  aMaçã  aDoagnose foliar  aDRIS  aEquilíbrio nutricional1 aDECHEN, A. R.  tScientia Agricola, Piracicabagv. 64, n. 3, p. 288-294, 2007.