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Potassium nitrogen ammonium nitrate ratio and sodium chloride effects of wheat growth i. shoot and root growth and mineral composition

Silberbush, M.; Lips, S.H.

Journal of Plant Nutrition 14(7): 751-764

1991


ISSN/ISBN: 0190-4167
Accession: 007673177

Fertigation with KNO3 as a means of reducing salinity hazards was tested with peanut (Arachis hypogaea) plants grown on dune sand, resulting in a reduction of plant growth and yield. The objective of this work was to study the interactions between N, K+ and NaCl as well as the effects of the NH4+/NO3- ratio on vegetative and reproductive growth. Wheat (Triticum aestivum L.) plants were grown in polyethylene pots with fine calcareous dune sand with different proportions of NH4+ and NO3-, under saline (60 mM NaCl) and non-saline conditions. Three replicates were harvested at the beginning of flowering, and one was grown to grain maturity. NaCl reduced shoot dry weight in all the treatments. Increasing the NH4+ proportion in the total of 6 mM N in the nutrient solution, increased shoot dry weight, did not change nitrogen concentration in the dry mass but increased P percentage, either with or without 60 mM NaCl. The number of tillers produced in each treatment was correlated with dry matter yield. The effect of the NH4+/NO3- ratio may be explained by alteration of the cation-anion balance on the nutrient uptake by roots, which lowered pH of the nutrient solution with increasing NH4+ concentration by alteration of cation-anion balance on the nutrient uptake by roots, which lowered pH of the nutrient solution with increasing NH4+ concentration.

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