Rafael Felippe Ratke
Abstract:
The fertilization of the banana tree mainly with nitrogen and potassium, it's one of the main stages to increase the productivity and quality of fruits of the banana tree. Resistant varieties Sigatoka Negra are being developed, but there is lack of technical knowledge for its adoption. The goal of this work was to adapt the levels of combined manuring of N and K in three you cultivate of banana tree and to verify the best combined dosagem of N and K for each to cultivate. The experiment was installed, at the Centro Tecnológico COMIGO, in subdivided portions, which three banana cultivars (Tropical to cultivate tolerant to Mal-do-Panama, Thap Maeo to cultivate resistant Sigatoka Negra and to Mal-do-Panama, and the Prata Anã to cultivate commercial of subgrup silver susceptible to Sigatoka Negra) with 5 manuring levels (D 0 - 0 kg ha-1 year-1 of N and 0 kg ha-1 year-1 of K2O; D 1 - 150 kg ha-1 year-1 of N and 200 kg ha-1 year-1 of K2O; D 2 – 300 kg ha-1 year-1 of N and 450 kg ha-1 year-1 of K2O; D 3 – 450 kg ha-1 year-1 of N and 600 kg ha-1 year-1 of K2O; D 4 - 600 kg ha-1 year-1 of N and 800 kg ha-1 year-1 of K2O). The characteristics plant height, pseudostem diameter, number of viable leaves was appraised to the 150 and 365 days after the planting, they were made samples you foliate in the emission of the flower, and the count of the number of plants with flower to the 365 days after planting. The combined doses of N and K favored the vegetative growth of the banana tree plants. The Tropical and Thap Maeo presented same initial development the Prata-Anã. The points of maximum development in function of the combined doses of N and K were larger for the Prata-Anã. Thap Maeo presented lineal regressions for height of plants, diameter of the pseudocaule and florescimento index to 365 D.A.P. The genetic difference among them cultivate it influenced the nutrients tenors found in the leaves of the banana trees. The nutrients nutrients found in the leaves of the banana trees they were influenced by the combined doses of N and K. The combined doses of N and K they favored the accumulation of N, K and B to foliate in quadratic regression and Mn and Zn to foliate in lineal regression.
