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The aim of this study was to determine the best planting practices for two biofortified Orange Fleshed Sweet Potatoes (OFSP). The study investigated the effect of spacing (20, 30 and 40 cm) and maturity (12 and 16 weeks) period on the proximate composition, α-amylase, reducing sugar and soluble carbohydrates of two OFSP varieties (Umuspo1 and Ex-Onyunga). The results indicated that Ex-Onyunga variety planted at 40 cm spacing and harvested at the period of 12 weeks had the highest protein content (2.88%) which was significantly different (p<0.05) from OFSP harvested at 16 weeks. The α-amylase content at was highest at 12 weeks for Umuspo 1 variety spaced at 30 cm distance (45.65 μg/g) and lowest for Umuspo 1 variety, spaced at 40cm distance (18.94 μg/g). The reducing sugar content ranged from 166.32 to 234.21μg/g under various planting spacing conditions at 12 weeks and 164.21 to 208.07μg/g at 16 weeks maturity period. The soluble carbohydrate content ranged from 43.57 to 51.19μg/g at 12 and 16 weeks maturity period respectively. Spacing and maturity period had significant (p<0.05) effects on the proximate composition and other parameters evaluated. This research has established a frame work for Agriculturists on the best planting spacing to be adopted for optimum nutrient yield of the two OFSP varieties. Maximum yield of alpha-amylase can be obtained within 12 weeks of planting at a distance of 30cm.

sustainable food production

Effect of Planting Distance and Harvesting Period on the Composition, and Quality Parameters of Orange Fleshed Sweet Potato Varieties (Umuspo-1 and Ex-Onyunga)