Effect of nitrogen and nitrate: ammonium ratio on growth indices and essential oil content of Origanum vulgare ssp. Gracile under saline conditions

Document Type : Original Article

Authors

urmia university

Abstract

In order to evaluate effects of different levels of nitrogen and different ratios of nitrate: ammonium under saline and non-saline conditions on growth indices, essential oil content and yield of Origanum Vulgare ssp. Gracile, a factorial experiment was carried out in randomized complete block design (RCBD) with third factors including nitrogen levels (5, 10, and 15 mM), nitrate: ammonium ratios (100:0, 87.5:12.5, 75:25, 50:50, 25:75, 0:100), and salinity levels (0 and 50 mM NaCl) in three replications. The results showed that under non-saline condition, the highest fresh weight (33.34 g), dry weight (8.16 g), and essential oil yield (158.9 mg/pot) were obtained by 15 mM nitrogen and 75:25 nitrate: ammonium ratio. Under saline condition, all the three above-mentioned traits were reduced in all treatments however under this condition, the highest fresh weight (33.34 g), dry weight (4.56 g) and essential oil yield (94.35 mg/pot) were observed by 15 mM nitrogen and 50:50 nitrate: ammonium ratio. The main effects of all treatments on essential oil content were significant (p ≤ 0.01); so that the highest essential oil content obtained by 15 mM nitrogen, 75:25 nitrate: ammonium ratio, and 50 mM salinity. In conclusion, 15 mM nitrogen with 75:25 and 50:50 nitrate: ammonium are recommended for non-saline and saline conditions, respectively.

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References
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