Abstract
The objective of this work was to evaluate sweet potato cultivars with starch processing capability, on two cultivation periods, in the western region of Parana (Brazil). Sweet potato was grown at Marechal Cândido Rondon, Parana State (24o33’40”S and 54o04’12”W), at a mean annual temperature between 14 and 28oC. The experiment was designed in complete randomized blocks, in a factorial scheme of 4 cultivars (CNPH 003, CNPH 004, Brazlândia Roxa, and Brazlândia Rosada) and 2 cultivation periods (115 and 183 days), with four repetitions. The evaluated parameters were the root productivities (t ha -1 ) and the physical and chemical root composition (humidity, pH, acidity, starch, total soluble sugars and fibers). Data was submitted to an analysis of variance (Anova) and the means were compared by the Tukey test at 5% of probability. Results indicated that sweet potato yield at the cultivars was higher during the 183 day cultivation period (average of 9.14 t ha -1 ) than during the 115 day cultivation period (average of 4.25 t ha -1 ). Thus the CNPH 003 cultivar seems to be a better indication for starch extraction, due to the lowest fiber content in the root, the driest mass content and the largest yield of starch per area
Highlights
A batata-doce [Ipomoea batatas (L.) Lam.] pertence à família das convolvuláceas, sendo uma das plantas alimentares mais antigas do Brasil
Data was submitted to an analysis of variance (Anova) and the means were compared by the Tukey test at 5% of probability
Results indicated that sweet potato yield at the cultivars was higher during the 183 day cultivation period than during the 115 day cultivation period
Summary
O experimento de campo foi conduzido no município de Marechal Cândido Rondon, Estado do Paraná de 21/01 a 24/07 de 2002, em solo classificado como Latossolo Vermelho eutroférrico. Fez-se a adubação mineral da área, seguindo-se a recomendação da Embrapa (Miranda et al, 1987) de 500 kg ha-1 de adubo da fórmula 4-14-8 para solos férteis. O adubo foi distribuído a lanço, na área, seguido da incorporação e levantamento das leiras (30 cm de altura) com uma enxada rotativa encanteiradora. Os cultivares utilizados foram CNPH 003, CNPH 004, Brazlândia Rosada e Brazlândia Roxa, originárias da Embrapa-CNPH como cultivares resistentes às pragas. Utilizou-se o delineamento experimental de blocos casualizados, em esquema fatorial 4 x 2, com 4 repetições, dos quais os fatores foram: cultivar (CNPH 003, CNPH 004, Brazlândia Roxa e Brazlândia Rosada) e época de colheita (115 e 183 dias). A colheita foi realizada em duas épocas, a primeira em 16/05/2002, aos 115 dias, e a segunda no dia 24/07/2002, aos 183 dias do plantio.
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