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vol.63 número2Crescimento e nutrição mineral de cebolinha verde cultivada hidroponicamente sob diferentes concentrações de N, P e KEfeito de doses de fósforo na produtividade e armazenamento pós-colheita de dois cultivares de cebola índice de autoresíndice de assuntospesquisa de artigos
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Revista Ceres

versão impressa ISSN 0034-737Xversão On-line ISSN 2177-3491

Resumo

BRAUN, Heder et al. Carbohydrates Concentration in leaves of potato plants affected by nitrogen fertilization rates. Rev. Ceres [online]. 2016, vol.63, n.2, pp.241-248. ISSN 2177-3491.  http://dx.doi.org/10.1590/0034-737X201663020016.

At poor conditions of nitrogen (N) in the soil, potato plants may accumulate starch in leaves and be indicative of N nutritional stress. The objective of this work was to determine the effects of N rates (0, 50, 100, 200 and 300 kg ha-1 of N) on the concentrations of carbohydrates (total soluble sugars-TSS, reducing sugars-RS, non-reducing sugars-NRS and starch) in the fourth leaf (FL) of two potato cultivars (Asterix and Atlantic) and their critical levels (CL) associated to the N fertilization rate necessary to obtain the maximum physical (MPE) and economic (MEE) efficiency of tubers. A randomized block design with four replications was used in both experiments. On day 21 after plant emergence, four FL were collected from four plants. Potatoes plants fertilized with low rates of N accumulated less TSS in leaves than those properly fertilized. The opposite occurred with content of starch. The cultivars showed similar responses to five doses of N in relation to contents of starch and TSS. However, the response to the increase in doses of N for RS, NRS and Starch/NRS is cultivar-specific. The correlations between contents of RS, NRS and Starch/NRS with the starch and TSS were dependent on the potato cultivar.

Palavras-chave : correlation; fourth leaf; Solanum tuberosum L.; sugar, starch.

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