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Nutritional Status and Growth of Wheat Plants Grown under Salinity Stress Conditions as Responded to Different Nitrogen Sources

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Author(s): Mahmoud M. Shaaban | El-Zanaty A.A. Abou El-Nour

Journal: American Journal of Plant Physiology
ISSN 1557-4539

Volume: 8;
Issue: 1;
Start page: 32;
Date: 2013;
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Keywords: Wheat cultivation | abiotic stress | nutritional status | growth parameters | nitrogen forms

ABSTRACT
Nitrogen fertilization under salinity stress is of main concern to be investigated, especially in the arid and semiarid regions. Pot experiment was conducted in the greenhouse of the "Micronutrient Project", Fertilization Technology Department, National Research Centre, Dokki, Cairo, Egypt with Wheat (Triticum aestivum L. var. Gemieza9 ). Plants were grown on sandy soil under salinity stress to study their response to soil application of different nitrogen sources compared to those irrigated with tap water. Nitrogen fertilization was added to the pots in the rate of 168 kg N ha-1 as urea, ammonium nitrate, calcium nitrate or ammonium sulfate. Fifteen days after sowing, half of the pots of every treatment were irrigated regularly with tap water (S1) and the other half was irrigated with saline water (S2). Results showed that salinity stress of irrigation water significantly inhibited growth parameters in terms of plant height, fresh weight and dry weight accumulation. Nitrogen form significantly interacted with salinity stress of irrigation water. The highest reduction in all determined parameters was recorded with urea, while very slight or none with calcium nitrate. Macro- and micro-nutrient concentration and uptake by wheat shoots were significantly affected by salinity stress of irrigation water. The best uptake of almost all determined nutrients was achieved by calcium nitrate fertilizer, especially under salinity stress conditions. Thus among the used N- forms, calcium nitrate is the best nitrogen form can alleviate the harmful effects of saline ions and realizing good plant growth under salinity stress of irrigation water.
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