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Nitrogen concentration, ammonium/nitrate ratio and NaCl interaction in vegetative and reproductive growth of peanuts
Author(s) -
Silberbush M.,
Lips S. H.
Publication year - 1988
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1988.tb02008.x
Subject(s) - shoot , dry weight , point of delivery , horticulture , arachis hypogaea , calcareous , nitrogen , chemistry , hydroponics , ammonium , salinity , nutrient , vegetative reproduction , zoology , botany , agronomy , biology , ecology , organic chemistry
Peanuts ( Arachis hypogaea L. cv. Shulamit) grown with NO 3 − 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 m M NaCl and 2 or 6 m M N in the form of Ca(NO 3 ) 2 , NH 4 NO 3 or (NH 4 ) 2 SO 4 . 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 m M NaCl outside the growth pot to check their sensitivity to salt. Shoot dry weight became greater with increasing NH 4 + /NO 3 − ratio. Increasing the N concentration from 2 to 6 m M did not change shoot dry weight of the NH 4 NO 3 or NH 4 + ‐fed plants, but caused a reduction in shoot dry weight of NO 3 − ‐fed plants. Shoot dry weight was not affected by increasing the NaCl concentration to 50 m M . Salt caused an increase in the number of gynophores per plant and a reduction of the mean pod weight. A NaCl concentration of 100 m M and above reduced gynophore vitality. It is concluded that the salt sensitivity of peanut plants resides mainly in the sensitivity of the reproductive organs.