KENWORTHY AND DRIS NORMS FOR ‘PRATA-ANÃ’ AND ‘BRS PLATINA’ BANANA PLANTS IN IMPROVED FERTILITY SOILS

The objective was to establish and evaluate the similarity of the Kenworthy and DRIS norms for ‘Prata’ banana in soils with improved fertility. The data used were leaf nutrient contents and yields of 180 plots, from an experiment with two cultivars (‘Prata-Anã’ and ‘BRS Platina’), five doses of K2O (0; 200; 400; 600 and 800 kg ha-1) supplied with sources for organic management and six evaluation times (210; 390; 570; 750; 930 and 1,110 days after planting), in a randomized block design in factorial scheme, with three replicates. The database was separated from the average yield, 36.42 t ha-1 cycle-1 for ‘Prata-Anã’ and 38.4 t ha-1 cycle-1 for ‘BRS Platina’, into low-yielding population (LYP) and high-yielding population (HYP). Mean, standard deviation, coefficient of variation, variance and variance ratio (HYP/LYP) of nutrients and their bivariate ratios, direct (A/B) and inverse (B/A), were calculated. ‘Prata-Anã’ and ‘BRS Platina’ in HYP differed in terms of the means and variances for Kenworthy by 33.00%, for the DRIS, the means differed in 71.21% and variances in 43.18% of the cases. The Kenworthy and DRIS norms established support the nutritional diagnosis of ‘Prata-Anã’ and ‘BRS Platina’ banana plants grown in soils with improved fertility.