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YIELD RESPONSE OF LIVINGSTONE POTATO (Plenthrantus esculentus) TO DIFFERENT LEVELS OF POTASSIUM AND POULTRY MANURE IN SOUTH-EAST NIGERIA
Abstract
Two years field experiments factorised in a 2×2×4 randomised complete block design were conducted in 2012 and 2013 cropping seasons in South-East Nigeria to investigate the yield response of rizga (Livingstone potato) to different rates of potassium (K) and poultry manure (PM). The soil was acidic, with well drained sandy top soil. Land preparation consists of clearing, disc ploughing, harrowing and ridging. The field was marked out into various plots of 3mx4m (12m²) with planting space of 0.3m x 1m. Planting was done on the crest of the ridges. Treatments consist of 0, 20, 40 and 60kg of K and 0, 5, 10 and15 tonnes of PM per hectare including one variety of Rizga (Longart). The experiment was replicated three times. The result showed that K and PM rates significantly affected the yield components at 8 weeks after planting (WAP). It was also observed that among all the rates, 20kg K when combined with 5t/ha of PM gave the highest mean yield in both years and was therefore recommended for optimum production of Rizga.
