%0 Journal Article
%T Avalia£¿£¿o do estado nutricional do nitrog¨ºnio em batateira por meio de polifen¨®is e clorofila na folha
%A Coelho
%A Fabr¨ªcio Silva
%A Fontes
%A Paulo Cezar Rezende
%A Finger
%A Fernando Luiz
%A Cecon
%A Paulo Roberto
%J Pesquisa Agropecu¨¢ria Brasileira
%D 2012
%I EMBRAPA
%R 10.1590/S0100-204X2012000400015
%X the objective of this work was to evaluate the effect of n rates on physiological indexes related to nitrogen nutrition in potato, and to verify the possibility of indirectly estimating leaf n contents. flavonol (flvi), chlorophyll (chli), and the nitrogen balance (nbi) indexes were evaluated, and estimations of leaf n contents were made at 21 and 42 days after emergence using the dualex leaf£¿clip instrument. the experiment was carried out from november 2010 to february 2011, in a randomized complete block design, with five n rates (0, 50, 100, 200, and 300 kg ha£¿1 of n, applied as urea) at pre£¿planting, and four replicates. there was an increase in chli and nbi and a decrease in flvi with the increasing n doses. the indexes determined with dualex were correlated with n and extractable chlorophyll content in the fourth leaf and with potato tuber yields. dualex can be used to evaluate n nutritional status in potato plants, and for the prognosis of final tuber yield with readings.
%K solanum tuberosum
%K nutritional balance
%K chlorophyll
%K phenolic compounds
%K flavonols.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0100-204X2012000400015&lng=en&nrm=iso&tlng=en