Nutrient potassium is critical in plantain (Musa spp. cv. AAB) nutrition and may play a key role in its vegetative growth and bunch development. Growth 0f both plant and ratoon crops was enhanced by application of 400 kg k 2 0 /ha. Tallest plants were 350cm tall with thickest trunks or pseudostem (56-58 cm thick) girth, had highest (11-12) number of functional leaves/plant at flowering and attained the booting stage after nine months of vegetative growth. Application of 300 kg muriate of potash (K 2 0) per hectare to the plant crop and 400 kg K 2 0/ha to the ratoons significantly (P = 0.05) influenced the bunch yield and yield components (number of hands and fingers/bunch, finger mass, girth and length). Bunch yield increased with increasing K20 rates applied. Highest bunch yield increases of 5.86 and 6.00 tonnes/ha were obtained by fertilizing the plant and ratoon crops with 300 and 400 kg k20/ha, respectively. Heaviest bunches were 8.8 and 9.8 kg/plant in plant and ratoon crops, giving the respective corresponding bunch yields of 15.7 and 16.3 tonnes/ha. An application of 300 kg K 2 0/ha to the plant crop and 400 kg K20/ha at the ratoon stage would be adequate for sustainable productivity of False Horn plantain in the high rainforest zone of Cross River State, Nigeria.
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