The Effect Of Pre-Sowing Treatments On Germination Of (Peltophorum Pterocarpum (Dc.) K. Heyne) Seeds.

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Date
2015-05-13
Authors
Ibrahim, Noha Isam Eldin
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UOFK
Abstract
A preliminary experiment was carried out in the Seed Administration Laboratory, Ministry of Agriculture and Forestry to determind the optimum range of sulfuric acid concentration and soaking duration for chemical scarification of peltophorum seeds. Three main experiments and a final experiment were carried out under nursery conditions at the Department of Horticulture, Faculty of Agriculture, University of Khartoum. Fresh seeds were collected from two sources, Shambat (Khartoum) and Kenana, each seed source was treated and sown separately. The first experiment was carried out to study the effect of soaking in different concentrations of sulfuric acid for different durations, which was based on the results of the preliminary test, on germination percentage, germination rate and seedling growth. The second experiment was conducted to determine the effect of submerging seeds in boiling water for different periods of time on germination percentage, germination rate and seedling growth. The third experiment was established to study the effect of mechanical scarification on germination percentage, germination rate and seedling growth. In the final experiment, the treatment with the best result, from each of the three experiments, was selected and compared to determine the treatments with the highest germination percentage, highest germination rate and seedling vigor. The results of the preliminary experiment showed that soaking in sulfuric acid had a highly significant effect on germination percentage, however, long soaking duration in a high concentration resulted in germination failure. In the first experiment, soaking in sulfuric acid increased the germination percentage significantly, the best treatment was soaking in concentrated sulfuric acid for 20 minutes. Germination rate and seedling growth were also increased significantly by soaking in sulfuric acid, and the best treatment was soaking in 75% sulfuric acid for one hour. In the second experiment the results revealed that submerging seeds in boiling water for 2 minutes had the highest germination percentage, germination rate and greatest seedling growth, while submerging in boiling water for 10 minutes led to germination failure. In the third experiment, the results showed that scarifying seeds mechanically significantly increased germination percentage, germination rate and seedling growth. The results of the final experiment revealed that there was a highly significant difference between treated and untreated seeds. Soaking in concentrated sulfuric acid for 20 minutes gave the highest germination percentage, and the control gave the lowest. While soaking in 75% sulfuric acid for one hour significantly increased germination rate and gave the best seedling growth.
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June, 2004
Keywords
(Peltophorum Pterocarpumو (Dc.) K. Heyne) Seeds.
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