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ISSN : 2456-8643

Title:
INFLUENCE OF NITROGEN ADDITION AND SODIUM CHLORIDE IN IRRIGATION WATER ON GROWTH OF LETTUCE

Authors:
Idress A. Al Gehani and Niseia B. Mjawer

Abstract:
Plants of lettuce (Lactuca sativa L. cv Great Lakes 118) were irrigated by different levels of NO3NH4 as source of nitrogen and NaCl as source of salinity to investigate the effect of addition nitrogen on plant growth under salinity condition. Three levels of Nitrogen (N): 0, 50 and 100 ppm were prepared from 0, 145 and 285 ppm of NO3NH4. Four levels of Salinity: 500 (fresh water), 700, 900 and 1100 ppm were prepared by adding 0, 200, 400 and 600 ppm of NaCl in fresh water. The leaf numbers (LN), leaf area (LA), specific leaf weight (SLW), head fresh weight (HFW), head dry weight (HDW) and water content of leaves (WC) were measured for each treatments at the end of the experiment. The results indicate that the lettuce used did not appear to be significantly affected by the high level of salinity applied in this experiment. On the other hand, the addition of nitrogen in the form of NO3NH4 had a positive effect on the growth of plants under salinity conditions, and appears to prevent the toxicity of the plant from Na+ and Cl. We conclude that lettuce plants have shown a reasonable degree of tolerance to irrigation water salinity when specific levels of nitrogen fertilization are available

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