Effect of fertigation with potassium and nitrogen on gas exchange and biomass accumulation in eggplant

Authors

DOI:

https://doi.org/10.5216/pat.v47i3.47885

Keywords:

Solanum Melongena L., photosynthesis, mineral nutrition, water-use efficiency.

Abstract

Adequate crop fertilization is one of the challenges for agriculture. Measuring gas exchange and biomass accumulation may be used to adjust crop management. The effect of fertigation with potassium (0 kg ha-1, 54 kg ha-1, 108 kg ha-1 and 216 kg ha-1) and nitrogen (0 kg ha-1, 67 kg ha-1, 134 kg ha-1 and 268 kg ha-1) on gas exchange and biomass accumulation in eggplant was assessed under greenhouse conditions. The net photosynthesis, stomatal conductance, transpiration, internal CO2 concentration, instantaneous carboxylation efficiency, water-use efficiency and total dry weight were evaluated. With the exception of K for water-use efficiency and N for internal CO2 concentration, all the other gas exchange parameters were significantly affected by the K and N doses. There was an interaction between N and K doses for net photosynthesis, stomatal conductance, transpiration and instantaneous carboxylation efficiency. The highest values for net photosynthesis, stomatal conductance, transpiration rate, carboxylation instantaneous efficiency and total dry weight were found in the range of 125-185 kg ha-1 of K and 215-268 kg ha-1 of N.

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Author Biographies

  • Álvaro Henrique Cândido de Souza, State University of Maringá

    Doutorando

    Pós Graduação em Agronomia
    Produção Vegetal

  • Roberto Rezende, State University of Maringá

    Professor titular

    Pós Graduação em Agronomia
    Produção Vegetal

  • Marcelo Zolin Lorenzoni, State University of Maringá

    Doutorando

    Pós Graduação em Agronomia
    Produção Vegetal

  • Fernando André Silva Santos, State University of Maringá
    Doutorando
    Pós Graduação em Agronomia
    Produção Vegetal
  • André Maller, State University of Maringá
    Doutor
    Pós Graduação em Agronomia
    Produção Vegetal

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Published

2017-10-04

Issue

v. 47, n. 3, Jul./Sep. 2017

Section

Research Article

License

Authors will not be paid for published articles and must waive their copyright in favor of the PAT journal. On the other hand, they are solely responsible for the content of those articles, even if the Editor holds the right to adjust them to the norms of the journal. Authors are allowed to publish their articles simultaneously in their institutional repositories, as soon as the original publication at the PAT journal is mentioned.

How to Cite

CÂNDIDO DE SOUZA, Á. H. et al. Effect of fertigation with potassium and nitrogen on gas exchange and biomass accumulation in eggplant. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], v. 47, n. 3, p. 345–352, 4 Oct.2017.