Effect of soil amendments on the nutritional quality of three commonly cultivated lettuce varieties in Ghana

Effect of soil amended with poultry manure and NPK fertilizer on the quality of three cultivars of lettuce; Great Lake, Eden and Trinity cultivated in KNUST, were assessed and analysed. The cultivars were raised, harvested and stored at the Department of Horticulture of the Kwame Nkrumah University of Science and Technology, Kumasi. The harvested leaves were assessed for calcium, iron, vitamin C, chlorophyll, carotenoid level, weight loss and dry matter content. The treatments showed a significant effect (p≤0.05) on the quality parameters except weight loss and dry matter content. The cultivars also varied (p≤0.05) with regards to the quality indicators assessed. Similarly, the interaction of the treatments and cultivars showed  significant differences.   Key words: Organic fertilizer, Inorganic fertilizer, quality, shelf life Lactuca sativa.