Evaluation of potato nitrogen status based on polyphenol and chlorophyll leaf content
DOI:
https://doi.org/10.1590/S1678-3921.pab2012.v47.11925Keywords:
Solanum tuberosum, real‑time evaluation, nutritional balance, chlorophyll, phenolic compounds, flavonolsAbstract
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.Downloads
Published
2012-05-23
How to Cite
Coelho, F. S., Fontes, P. C. R., Finger, F. L., & Cecon, P. R. (2012). Evaluation of potato nitrogen status based on polyphenol and chlorophyll leaf content. Pesquisa Agropecuaria Brasileira, 47(4), 584–592. https://doi.org/10.1590/S1678-3921.pab2012.v47.11925
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Section
MINERAL NUTRITION