Abstract
Sweet potato (Ipomoea batatas L.) is a species that belongs to the family Convolvulaceae, and is originated from Central America and South America. As the growing conditions have great influence on the crop, the determination of harvesting time may vary with the cultivar, the growing region, or with the type of consumption (in natura or industrial). The aim of this work was to evaluate the performance of Ipomoea batatas L. clones, cultivated in three regions in the state of Sergipe, for starch and ethanol production. Thirty-one sweet potato clones grown in three municipalities of the state of Sergipe were tested in a randomized block design. The following variables were analyzed: root dry matter content (RDMC), root starch content (SC), starch yield (SY), ethanol yield (EY), and ethanol yield per ton of root (EYR). EY values ranged from 5910.39 to 8516.12 L ha-1; from 5141.85 to 6937.63 L ha-1; and from 5829.62 to 8211.77 L ha-1 in the municipalities of Sao Cristovao, Malhador, and Caninde de Sao Francisco, respectively, for clones IPB-075 and IPB-087 and cultivar Palmas. Estimates of heritability (h2) were above 50%. The values of the ratio between the coefficient of genetic variation (CVg) and the coefficient of environmental variation (CVe) for RDMC, SC, and EYR were high.
Highlights
Sweet potato (Ipomoea batatas L.) is a species that belongs to the family Convolvulaceae; it is originated from Central America and South America, and is grown from the Yucatan Peninsula, in Mexico, to Colombia and Brazil (SILVA et al, 2004)
Root dry matter content (RDMC) For the municipality of São Cristóvão, three groups were formed for root dry matter content (RDMC), with values ranging from 29.72% to 44.05%
For the municipality of Malhador, two groups were formed for RDMC, with values ranging from 24.26% to 36.82% (Table 3)
Summary
Sweet potato (Ipomoea batatas L.) is a species that belongs to the family Convolvulaceae; it is originated from Central America and South America, and is grown from the Yucatan Peninsula, in Mexico, to Colombia and Brazil (SILVA et al, 2004). Despite being grown as an annual crop, sweet potato is a perennial, continuous tuber plant, and its natural death only occurs under severe weather conditions, such as frost, or long drought periods. Harvest begins at 90 days after planting. It can occur between 120 and 150 days after planting, depending on the growing conditions, on the environmental conditions, and on the variety of sweet potato used (SILVA et al, 2002). Since the growing conditions greatly influence the crop, the determination of harvesting time may vary with the cultivar, with the growing region, or with the type of consumption (in natura or industrial). The species can be harvested later, since the primary interest is to obtain large quantities of dry matter and high carbohydrate levels, which results in higher yields for the industrial process (QUEIROGA et al, 2007)
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