@article{BYBORDI_TABATABAEI_AHMADOV_2009, title={Effects of Salinity and NO3:NH4 Ratio on Yield and Quality in Canola (Brassica napus L.)}, volume={1}, url={https://www.notulaebiologicae.ro/index.php/nsb/article/view/3442}, DOI={10.15835/nsb113442}, abstractNote={<p style="text-align: justify;">The effect of salinity and NO<sub>3 </sub>: NH<sub>4</sub> ratio (0:100, 75: 25, 50:50, and 25:75) in the nutrient solution on growth, yield quality and N metabolism in hydroponically grow canola (<em>Brassica napus</em> L.) was evaluation. Both fresh and dry weights of leaves were significantly lower when a high concentration of either NO<sub>3</sub> (100%) or NH<sub>4</sub> (75%) was the sole N source in the nutrient solution. In nonsaline condition, increasing of both NH<sub>4</sub> and NO<sub>3</sub> ratio in the nutrient solution reduced photosynthetic (<em>pn</em>) rate, however in salinity condition the reduction of <em>pn</em> became more pronounced at a higher ratio of NH<sub>4</sub> in the nutrient solution. The yield in terms of the fresh and dry weight of seed per plant was significantly increased at the 75:25 (NO<sub>3 </sub>: NH<sub>4</sub>) treatments. Total fat in nonsaline condition was increased with increasing NH<sub>4</sub> ratio in the nutrient solution, however in saline condition it was reduced, at high NH<sub>4</sub> ratio in the nutrient solution. The increase of tissue N concentration was nearly proportional to the NH<sub>4</sub> concentration in the nutrient solution. The activity of nitrate reductase (NR) was increased by increasing NH<sub>4</sub> from 0 to 50% and then reduced at a higher ratio of NH<sub>4</sub> in the solution. Salinity increased NH<sub>4</sub> concentration so that the saline condition had nearly twice high NH<sub>4</sub> concentration in the leaves. The increase of NH<sub>4</sub> concentration induced by salinity could be partially the reduction of NH<sub>4</sub> assimilate because of the shortage of carbohydrate.</p>}, number={1}, journal={Notulae Scientia Biologicae}, author={BYBORDI, Ahmad and TABATABAEI, Jalal and AHMADOV, Ali}, year={2009}, month={Dec.}, pages={67–72} }