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

Authors

  • Álvaro Henrique Cândido de Souza Universidade Estadual de Maringá
  • Roberto Rezende Universidade Estadual de Maringá
  • Marcelo Zolin Lorenzoni Universidade Estadual de Maringá
  • Fernando André Silva Santos Universidade Estadual de Maringá
  • André Maller Universidade Estadual de Maringá

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, Universidade Estadual de Maringá

Doutorando

Pós Graduação em Agronomia
Produção Vegetal

Roberto Rezende, Universidade Estadual de Maringá

Professor titular

Pós Graduação em Agronomia
Produção Vegetal

Marcelo Zolin Lorenzoni, Universidade Estadual de Maringá

Doutorando

Pós Graduação em Agronomia
Produção Vegetal

Fernando André Silva Santos, Universidade Estadual de Maringá

Doutorando
Pós Graduação em Agronomia
Produção Vegetal

André Maller, Universidade Estadual de Maringá

Doutor
Pós Graduação em Agronomia
Produção Vegetal

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Published

2017-10-04

How to Cite

CÂNDIDO DE SOUZA, Álvaro H.; REZENDE, R.; ZOLIN LORENZONI, M.; SILVA SANTOS, F. A.; MALLER, A. Effect of fertigation with potassium and nitrogen on gas exchange and biomass accumulation in eggplant. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 47, n. 3, p. 345–352, 2017. Disponível em: https://revistas.ufg.br/pat/article/view/47885. Acesso em: 21 nov. 2024.

Issue

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

Section

Research Article

License

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