Study Effect of NaCl Salinity and Nitrogen Form on Composition of Canola (Brassica napus L.)

The effect of two N forms ( NH + 4 and NO - 3 ) and NaCl on accumulation of some essential mineral nutrients was examined in canola (Brassica napus L.) cv. ‘SLM 046 ’ld plants of were subjected for 21 day to Hoagland’s nutrient solution containing 10 mM NH + 4 and NO - 3 and salinized with 0, 50, 100 and 150 mm NaCl. N form and addition of NaCl to the growth had no significant effect on total N. However, root N of NH + 4 supplied plants decreased significantly with increase in NaCl concentration, whereas that of NO 3 - supplied plants remained unaffected. Salinity of the rooting also did not show any significant effect on Na + concentration of leaves or roots of plants subjected to two different forms of nitrogen. NH + 4 treated plants generally had greater concentration of Cl - in leaves and roots and lower K + content in leaves than NO 3 - supplied plants. Ca 2+ concentration of leaves and roots concentration of leaves decreased in NH + 4 - supplied plants due to NaCl, but they remained unaffected in NO 3 - treated plants.