EFFECT OF NITROGEN SOURCES AND GIBBERELLIC ACID RATES ON GROWTH AND CHEMICAL COMPOSITION OF CYCAS PLANTS (Cycas revoluta THUMB.) | ||||
| Journal of Plant Production | ||||
| Article 13, Volume 30, Issue 2, February 2005, Page 1011-1020 PDF (129.61 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2005.237140 | ||||
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| Author | ||||
| F. M. El- Fawakhry, | ||||
| Botanical Gardens Research Department, Antoniades Branch, Hort. Res. lnst1, A.R.C. Alexandria. Egypt. | ||||
| Abstract | ||||
| The present work was designed to study the effect of different nitrogen sources (ammonium nitrate, ammonium sulphate and urea) and gibberellic acid rates (0, 250 and 500 p.p.m. /plant) on growth of Cycas revoluta seedlings, that were one-year-old, during two experiments of 2003 and 2004 in the green-house at Antoriiades Branch, Hon. Res. Inst., A.R.C. Alexandria. Egypt. The results indicated that ammonium nitrate significantly increased most of the studied vegetative growth characteristics (number of leaves? plant, leaf length , leaflet length and number/ leaf, fresh and dry weights of leaves? plant, fresh weight of stem and its circumference, leaves content of total chiorophylls and nitrogen percent of dry Leaves), compared to ammonium sulphate and urea. Gibberellic acid had insignificant effects on most characteristics of vegetative growth while reduced the others. In general, using ammonium nitrate (33.5%) as source of nitrogen at the rate of 1.5g / plant monthly during the growth of Cycas revoluta seedlings was the best treatment without using GA3 in the green-house. | ||||
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