African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6638

Full Length Research Paper

Silicon and excess ammonium and nitrate in cucumber plants

Cid Naudi Silva Campos
  • Cid Naudi Silva Campos
  • Departamento de Solos e Adubos, Universidade Estadual Paulista “Julio de Mesquita Filho”, UNESP, Via de acesso Prof. Paulo Donato Castellane s/n, CEP: 14884-900, Jaboticabal-SP, Brazil.
  • Google Scholar
Renato de Mello Prado
  • Renato de Mello Prado
  • Departamento de Solos e Adubos, Universidade Estadual Paulista “Julio de Mesquita Filho”, UNESP, Via de acesso Prof. Paulo Donato Castellane s/n, CEP: 14884-900, Jaboticabal-SP, Brazil.
  • Google Scholar
Gustavo Caione
  • Gustavo Caione
  • Departamento de Solos e Adubos, Universidade Estadual Paulista “Julio de Mesquita Filho”, UNESP, Via de acesso Prof. Paulo Donato Castellane s/n, CEP: 14884-900, Jaboticabal-SP, Brazil.
  • Google Scholar
Antonio João de Lima Neto
  • Antonio João de Lima Neto
  • Departamento de Solos e Adubos, Universidade Estadual Paulista “Julio de Mesquita Filho”, UNESP, Via de acesso Prof. Paulo Donato Castellane s/n, CEP: 14884-900, Jaboticabal-SP, Brazil.
  • Google Scholar
Fábio Luiz Checchio Mingotte
  • Fábio Luiz Checchio Mingotte
  • Departamento de Solos e Adubos, Universidade Estadual Paulista “Julio de Mesquita Filho”, UNESP, Via de acesso Prof. Paulo Donato Castellane s/n, CEP: 14884-900, Jaboticabal-SP, Brazil.
  • Google Scholar


  •  Received: 29 July 2015
  •  Accepted: 06 October 2015
  •  Published: 28 January 2016

Abstract

Excess ammonium and nitrate are associated with physiological disorders in plants; however, these disturbances can be minimized with the use of silicon, especially in plants supplied with ammonium. The objective of this study was to evaluate the effect of silicon on the presence of excess ammonium and nitrate in two cucumber varieties (Cucumis sativus) on physiology and growth of the plants. The experiment was carried out in hydroponic cultivated cucumber plants, at the São Paulo State University, Brazil. A completely randomized design was used with four replications, in a 2 × 3 × 2 factorial corresponding to two sources of nitrogen (ammonium and nitrate) at a concentration of 10 mmol L-1, three silicon concentrations (0, 1 and 10 mmol L-1) and two varieties of cucumber (Tsubasa and Hokushin). At 28 days after treatment application, evaluations were performed for silicon and nitrogen accumulation in the shoots, green color index, number of stomata, nitrate reductase activity, height, leaf number and dry matter mass. Silicon promoted an increase in the growth variables and improved the physiological parameters of the plants only when supplying the ammonium N source. The use of Si, independent of the cucumber variety, mitigated the toxicity of ammonium, resulting in greater total nitrogen accumulation and dry matter of plants; however, it did not benefit the plants under excess nitrate nitrogen.

 

Key words: Cucumis sativus, nitrogen, nutritional disorder, beneficial element, stress.

Abbreviation

MSD, minimum significant difference; EDDHMA, ethylenediamine-N, N-bis 2, hydroxy-methyl phenylacetic acid; GCI, green color index; DM, dry matter mass; NS, number of stomata.