Nutritional status and production of 'Prata-Ana' (AAB) and 'BRS Platina' (AAAB) banana plants with organic fertilization

The objective of this research was to evaluate the nutritional status and yield of 'Prata' bananas fertilized with different sources for organic management applied to soils with improved fertility. Two cultivars ('Prata-Ana.' and 'BRS Platina'), five annual potassium rates (0, 200, 400, 600, and 800 kg ha-1 of K2O) supplied by bovine manure and rock powder, and six evaluation periods (210, 390, 570, 750, 930, and 1.110 days after transplanting - DAT) were laid out in a randomized block design, in a 2 x 5 x 6 factorial arrangement with three replicates. The yield was determined over three cycles. The levels of K and S in leaves increased with increasing rates of K2O interacting with the evaluation periods. The levels of N, P, and Cu increased with increasing rates of K2O. High soil fertility and manure and rock powder applications were not enough to maintain appropriate levels of leaf Mn in 'Prata-Ana'. The levels of leaf K, S, Cu, and Zn in the cultivar Prata-Ana differed from those of the 'BRS Platina'. Applying manure and rock powder as organic fertilizers did not increase the yield of 'Prata-Ana' and 'BRS Platina' banana plants grown on soils with improved fertility during four production cycles.