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- Author or Editor: H. L. Hammett x
Three cultivars of sweet potato (Ipomoea batatas Lam.) were grown at 7 production sites in Mississippi during 1959 and 1960, using plants from a common source. Forty U.S. No. 1 roots of each cultivar at each production site were sampled and carbohydrate and carotene content determined. Variation in carotene content was much greater among cultivars when compared to variation among production sites, however, there were highly significant differences within a cultivar among the various production locations. Carbohydrate content within a cultivar varied among production sites more than among those at any one production site. The feasibility of establishing a nutrient content range for fresh vegetable products is highly questionable.
Twenty-one cultivars and/or breeding lines of sweet potato (Ipomoea batatas Lam) were exposed to 1°C for 48 hours followed by 48 hours at 25° and evaluated for hardcore during each of 2 seasons at the Mississippi Agricultural and Forestry Experiment Station. Hardcore was 50% more severe in 1976 than in 1975. One breeding line, ‘M3-309’, exhibited no injury symptoms either season; 60% of ‘M2-325’ roots and 15% of the ‘Centennial’ roots were injured. Other cultivars and breeding lines showed intermediate injury. Hardcore susceptibility was not correlated with dry matter content.
‘Centennial’ sweet potatoes (Ipomoea batatas (L.) Lam.) did not respond to increasing levels of P over an 8 year period probably due to the low soil pH and relatively high native P levels. Increasing the available soil moisture to above 25% resulted in a 3.4 MT/ha increase in yield of marketable roots over that obtained with natural rainfall but increasing the available moisture had no influence on yield. The P rate had no effect on dry matter and/or carotenoid content, firmness and splitting of processed roots. Protein content as percent of dry weight was reduced with increased P rate. Increasing the available soil moisture resulted in lower dry matter, protein, and carotenoid contents but had no influence on fiber content, firmness, or splitting.
Three sweet potato (Ipomoea batatas Lam.) cultivars that varied in vine length were compared at 5 N levels. Increasing N levels increased weight and the percentage of No. 1 grade roots of all cultivars. Vine length did not have a linear effect on yield. The long-vine ‘Centennial’ out-yielded the other cultivars, followed by the short-vine ‘L3-243’ and the intermediate-vine length ‘Goldrush’. N applications linearly increased dry matter, carotenoid (fresh and processed), protein content, and reduced fiber content of all cultivars. Cultivars varied significantly for each quality variable studied with the exception of protein content (fresh wt basis), including dry matter, carotenoids, fiber, firmness, and split roots after processing. N applications had no influence on soil P, K, Ca, Mg, or pH. Organic matter content of the soil was increased slightly by increased N applications, probably as a result of excessive vine growth, which was incorporated into the soil after harvest.