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This study aimed to estimate the critical levels for soil chemical attributes through the criterion of reduced continuous probability distribution (NCRIz) in areas under irrigated banana cultivation and evaluate soil fertility of low-yield areas in the Apodi Plateau. A dataset composed of analysis of 60 producing areas and their respective yields was used. It was concluded that the method can be used to obtain critical levels for soil chemical attributes and the critical levels obtained for the irrigated areas under banana cultivation corresponded to 7.2 for pH, 0.91 g kg-1 for N, 0.31, 6.34, 2.63, 1.42 and 25.76 mg kg-1 for Cu, Fe, Mn, Zn and P, respectively, and 6.43, 1.14, 0.24 and 0.36 cmolc kg-1 for Ca, Mg, Na and K, respectively. In the low-yield areas, the highest deficiencies were of P and Fe, and there was an excess of Mg

Critical levels for soil attributes in irrigated banana plantations in semiarid region