EFFECT OF NITROGEN FERTILIZATION AND SPRAYING GIBBERELLIC ACID (GA3) ON GROWTH, SEED YIELD AND ITS OIL CONTENT OF SOME LETTUCE CULTIVARS | ||||
| Journal of Food and Dairy Sciences | ||||
| Article 1, Volume 25, Issue 6, June 2000, Page 3427-3447 PDF (1.14 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jfds.2000.259127 | ||||
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| Authors | ||||
| Amal M. Farrag,1; H. M.A. Mohamed2 | ||||
| 1Vegetable Crops Dept., Faculty of Agric., Cairo Univ. Giza, Egypt. | ||||
| 2Food Science Dept., Faculty of Agric., Minia Univ. El-Minia, Egypt. | ||||
| Abstract | ||||
| In the present investigation, three cultivars of lettuce (Balady, Dark Green and Great Lakes) were fertilized with 30, 60 or 90 kg N/fed. and sprayed 2 times with GA3 at 0, 50 or 100 ppm. The height of Dark Green plants exhibited significant increase, whereas Balady plants gaved significant increase in plant fresh weight, number of leaves, seed yield/fed. and average weight of 1000 seeds. Great Lakes was the earliest cultivar and had the highest number of seed stalks and the maximal percentage of bolting plants. Increasing N levels significantly enhanced the plant height, fresh weight and number of leaves/plant. Application of 60 kg. N/fed. increased the percentage of dry matter of leaves and resulted in the highest percentage of bolting plants, seed stalks number/plant, seed yield/fed., weight of 1000 seeds and germination percentage of produced seeds. The seed oil percentage was also increased when the nitrogen application rate was raised. Balady seeds exhibited considerable increase in its oil content when fertilized with 90 kg N/fed. Using GA3 at 50 ppm increased seed stalks number/plant, percentage of bolting plants, seed yield, weight of 1000 seed and germination percentage of seed. However, the seed oil percentage decreased with the application of GA3. In general Balady plants fertilized with 60 kg N/fed. and sprayed with 50 ppm GA3 produced the highest seed yield. The results also revealed that lettuce seed oil (Balady cv.) could supplement or substitute the conventional oil types in terms of its fatty acid composition and other physicochemical properties | ||||
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