Nitrogen concentration, ammonium/nitrate ratio and NaCl interaction in vegetative and reproductive growth of peanuts

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32 Scopus citations

Abstract

Peanuts (Arachis hypogaea L. cv. Shulamit) grown with NO3 and saline water in hydroponics responded positively to addition of nitrogen (N) in their vegetative growth, but not in desert dune sand. In order to clarify these conflicting results, peanut plants were grown in a greenhouse pot experiment with fine calcareous sand. The nutrient solution contained 0 or 50 mM NaCl and 2 or 6 mM N in the form of Ca(NO3)2, NH4NO3 or (NH4)2SO4. Three replicates were harvested after 48 days (beginning of reproductive stage) and three after 109 days (pod filling). In addition, gynophores were treated with 0, 50, 100, 150 or 200 mM NaCl outside the growth pot to check their sensitivity to salt. Shoot dry weight became greater with increasing NH4+/NO3 ratio. Increasing the N concentration from 2 to 6 mM did not change shoot dry weight of the NH4NO3 or NH4+‐fed plants, but caused a reduction in shoot dry weight of NO3‐fed plants. Shoot dry weight was not affected by increasing the NaCl concentration to 50 mM. Salt caused an increase in the number of gynophores per plant and a reduction of the mean pod weight. A NaCl concentration of 100 mM and above reduced gynophore vitality. It is concluded that the salt sensitivity of peanut plants resides mainly in the sensitivity of the reproductive organs.

Original languageEnglish
Pages (from-to)493-498
Number of pages6
JournalPhysiologia Plantarum
Volume74
Issue number3
DOIs
StatePublished - 1 Jan 1988

Keywords

  • Ammonium/nitrate ratio
  • Arachis hypogaea L.
  • dune sand
  • gynophores
  • peanuts
  • water salinity

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science
  • Cell Biology

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