Desenvolvimento e produ??o de bananeiras Thap Maeo e Prata-An? com diferentes níveis de aduba??o nitrogenada e potássica

摘要

The objective of this research is to characterize the development and yield of banana trees in the Southwest region of Goiás and to adjust different combination levels of N and K. The experiment was conducted in dystrophic red Oxisol, in the district of Rio Verde, Goiás, and consisted on five doses of increasing rates of N and K (N0/K0 - 0 kg ha-1 year-1 of N and 0 kg ha-1 year-1 of K; N1/K1 - 150 kg ha-1 year-1 of N and 200 kg ha-1 year-1 of K ; N2/K2 - 300 kg ha-1 year-1 of N and 450 kg ha-1 year-1 of K; N3/K3 - 450 kg ha-1 year-1 of N and 600 kg ha-1 year-1 of K; N4/K4 - 600 kg ha-1 year-1 of N and 800 kg ha-1 year-1 of K), applied to two cultivars of bananas, Thap Maeo and Prata-an?. The evaluations conducted in the plants were: plant height, pseudo stem diameter and leaf number at 150 days after planting (DAT) and at flowering. The plants were assessed at the flowering and at the harvest observing the following yield components: the time elapsed between planting and flowering, leaf number at harvest, number of bunch per cluster and number of fruits in the second bunch, the length of the stem and the fruits in the second bunch, the diameter of the stem and fruits in the second bunch and the weight of the bunch, the stem and the fruits in the second bunch. The banana plants were sampled at flowering for analyzing the nutrient content. With the data of yield components were calculated durability index of the leaf and absolute rate of banana growth. The results were submitted to ANOVA and regression, and the mean comparison by the Tukey test. The attributes of development, production and leaf levels of nutrients in Thap Maeo and Prata-An? were influenced by different rates of combined N and K. The smallest interval between flowering days was found with rates of 300 kg ha-1 of N and 450 kg ha-1 of K in Thap Maeo. There was no better combination of N and K parameters for the development, production and leaf levels of nutrients in Prata-An?.