Evaluation of potato nitrogen status based on polyphenol and chlorophyll leaf content

Authors

  • Fabrício Silva Coelho Universidade Federal de Lavras - UFLA
  • Paulo Cezar Rezende Fontes Universidade Federal de Viçosa
  • Fernando Luiz Finger Universidade Federal de Viçosa
  • Paulo Roberto Cecon Universidade Federal de Viçosa

DOI:

https://doi.org/10.1590/S1678-3921.pab2012.v47.11925

Keywords:

Solanum tuberosum, real‑time evaluation, nutritional balance, chlorophyll, phenolic compounds, flavonols

Abstract

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.

Author Biography

Fabrício Silva Coelho, Universidade Federal de Lavras - UFLA

Possui graduação em Agronomia pela Universidade Federal de Lavras (2007) e Doutorado em Fitotecnia pela Universidade Federal de Viçosa (2011). Atualmente é Professor Substituto do Departamento de Agricultura da Universidade Federal de Lavras. Tem experiência na área de Agronomia, com ênfase em Nutrição Mineral e Adubação de Plantas e Olericultura.

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

Issue

Section

MINERAL NUTRITION