The effect of potassium nitrate and dolomitic limestone in the initial development in nursery of 'Prata-Anã' bananas from in vitro culture was evaluated. The seedlings were planted in polyethylene bags (32 x 14 cm), containing the substrate composed: of 60% of soil, 20% of rice husk and 20% of gross sand. The experiment was developed in a plastic screen-covered nursery (50% of insolation), adopting the complete randomized block experimental design with 16 treatments, 4 replicates and 5 plants per plot. The treatments were made up of 4 doses of dolomitic limestone (0, 3, 6 and 9 kg.m³ of substrate) combined with 4 doses of KNO3 (0, 5.1, 10.2 and 20.4 g.plant.application). The topdressing applications every 12 days, started after 20 days of transplanting, performed with 200 mL of solution of KNO3 per plant. At 95 days of nursery, only the effect of KNO3, mainly on the height of the seedlings, on the leaf area and on the number of leaves was found. At the doses of 5.1 g and 10.2 g of KNO3.plant.application, the seedlings reached 18.80 cm and 14.71 cm in height, respectively. The diameter of the pseudo stem of the seedlings was superior at the dose of 5.1 g of KNO3.plant.application, reaching 3.44 cm. Leaf areas and number of leaves were influenced significantly by KNO3 at the doses of 5.1g and 10.2 g KNO3.plant.application, presenting 246.03 cm² and 10.34 and 182.14cm² and 9,36, respectively. There was no effect of limestone for the evaluated characteristics.
Banana; Musa sp; cultivar Prata-Anã; nursery; nutrients minerals
