Nitrogen Nutrition and Adaptation of Halophyte Chenopodium quinoa to Salt Stress | ||
| Arab Universities Journal of Agricultural Sciences | ||
| Article 2, Volume 29, Issue 2, August 2021, Pages 491-503 PDF (285.94 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ajs.2021.73419.1367 | ||
| Authors | ||
| Karema Tarek* ; Ibrahim Alshamy; Sayed Hussin; Sayed Eisa | ||
| Botany Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt | ||
| Abstract | ||
| There is little evidence that the nitrogen nu-trition supply at rates above or less than what is considered optimal in non-saline conditions improves growth and yield of halophyte crop cultivated under salt stress. Therefore, hypoth-esize of the present work was to find out the magnitude to which N could restore the harm-ful effects of salt stress on quinoa plants. A pot experiment was performed in greenhouse con-ditions to evaluate quinoa's response grown under water salinity treatments (0.0 & 200 mM NaCl) when nitrogen nutrition rates were limiting (50ppm), adequate (250 ppm), and ex-cess (450 ppm) to guide proper application rate of nitrogen fertilizer under salinity stress. The results indicated that, salinity caused a signifi-cant decrease in the vegetative growth of the plant. Consequently, all vegetative measure-ments were negatively affected. As a result, the seed yield decreased to more than 50%. The application of a moderate level of nitrogen (250 ppm) caused a significant ameliorative effect on seed yield by 126% under non saline conditions and 34.5 % under saline conditions compared to the low nitrogen level. The results did not improve any further with the applica-tion of a higher level of nitrogen. These results indicate that applying (N) in adequate may im-prove most traits and prove to be a physiolog-ical treatment to increase resistance against the negative effects of salt stress in quinoa. | ||
| Keywords | ||
| Salt Stress; Nitrogen Nutrition; Nitrogen Use e Efficiency; Seed Yield; Cheno-podium quinoa | ||
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