Accumulation and distribution of nitrogen, phosphorus and potassium nutrient in two banana varieties in production areas in Guangxi

【Objective】To investigate the accumulation and distribution of nitrogen（N），phosphorus（P）and potassium （K）nutrient of two banana varieties，Guijiao 6 and Baodao，so as to provide reliable theoretical basis for the production and scientific fertilization of banana varietie.【Method】The accumulation and distribution of nitrogen，phosphorus and potassium in six organs，namely roots，corms，pseudostems，leaves，fruit axes and fruit organs of two banana varieties at different growth stages were studied by plant nutrition diagnosis under the condition of sufficient fertilization，and the Logistic model was used to fit the changes of N，P，K absorption.【Result】The nutrient characteristics of the two banana varieties were relatively consistent. The pre-bud leaves and pseudostems were the main organs for banana to absorb and accumulate N，P and K. The nutrient accumulation in the leaves decreased during the fruit development stage，but the distribution in the fruit increased significantly. The order of nutrient accumulation in the same organ at different growth stages was K>N>P from high to low. Differences of nutrient accumulation existed among varieties. From the vigorous growth period to the budding period，the nutrient accumulation of the whole plant of Baodao banana increased by 28.15% compared with that of Guijiao 6，and the accumulation of N，P and K increased by 34.12%，91.15% and 23.16% respectively. The ratio of N，P and K（N，P₂O₅，K₂O）in each growth stage of the two varieties was 1.00∶（0.06-0.28）∶（1.01-2.83）and 1.00∶ （0.08-0.26）∶（1.29-2.48），respectively. The demand for N，P and K was not balanced in each growth stage. The nutrient accumulation was less in the three months before transplanting. After entering the vigorous growth period，the nutrient accumulation increased with the growth and development，reached the highest value at the budding stage，and then decreased slightly. The accumulation curve of nitrogen，phosphorus and potassium was S-shaped.【Conclusion】The demand of Baodao banana for N，P and K nutrient is higher than that of Guijiao 6. The application of K fertilizer and N fertilizer should be especially increased throughout the growth period. P nutrient should be supplemented in time during the fruit development period to ensure a certain level of nutrient accumulation in the fruit.