Browsing by Author "Jayangani, P.H.D.N."

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    Effect of Hydro and Chemical Priming on Seed Germination and Seedling Growth of Rubber (Hevea brasiliensis)
    (Uva Wellassa University of Sri Lanka, 2020) Jayangani, P.H.D.N.; Nayanakantha, N.M.C.; Senevirathne, A.M.W.K.
    Rubber (Hevea brasiliensis) is propagated through grafting buds of selected clones onto vigorous seedling rootstocks using a green budding technique. Both rootstock and budwood should be of high quality for producing high quality budded rubber plants. Seeds are used in raising rootstock plants of rubber. Being recalcitrant, rubber seeds deteriorate within a few days after falling from trees. The use of old seeds has resulted in low germination and extended germination period in commercial rubber nurseries. The main objective of this study was to investigate the effects of hydro- and chemical-priming on seed germination and seedling growth of Hevea. The experiment was conducted in a nursery at the Rubber Research Institute of Sri Lanka, Dartonfield, Agalawatta. Seeds were soaked in solutions of ZnSO4 (1% & 2%) Urea (0.05%, 0.10%, & 0.15%) and in water (mock treatment) for 24 hours followed by sown in a germination bed according to a randomized complete block design. Un-primed seeds were used as control. Germination percentage was recorded at 7, 9, 11, 13, and 17 days after sowing. Growth parameters of seedlings were recorded at monthly intervals for up to three months after transplanting in polybags. Significantly higher germination percentages were recorded in seeds primed with water (hydro priming), urea, and ZnSO4 after 17 days of sowing when compared to control. However, the highest germination percentage was recorded from the seeds primed with water (mock treatment). No significant differences were recorded in growth parameters of seedlings raised from seeds primed with chemicals or water when compared to those derived from un-primed seeds (control). Therefore, hydro priming may be the simplest and cost-effective priming treatment to improve the germination of rubber seeds. Keywords: Germination, Growth, Seed Priming, Urea, Zinc Sulphate
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    Effect of Hydro and Chemical Priming on Seed Germination and Seedling Growth of Rubber (Hevea Brasiliensis)
    (Uva Wellassa University of Sri Lanka, 2015) Jayangani, P.H.D.N.
    Rubber (Hevea brasiliensis) is one of the economically important tropical trees. Both rootstock and budwood should be of high quality for producing high yielding rubber plants. Rubber seeds are used to produce high-quality plants; however rubber seeds belong to recalcitrant seeds category according to the seeds classification. Therefore, rubber seeds lose their viability within a few days after falling from the tree. For most rubber nurseries, nurserymen purchase seeds from outside suppliers who collect and store seeds for few days to weeks before supplying in bulk quantities. The main objective of this study is to investigate the effects of hydro and chemical priming on the germination of rubber seeds and the growth of rubber seedlings. The experiment was conducted in a nursery located at the Rubber Research Institute of Sri Lanka, Dartonfield Agalawatta in Kalutara district of the low country Wet Zone. Two experiments were conducted, one for studying the germination attributes and another for studying the growth of the seedlings. The experiments were laid down according to a Randomized Complete Block Design. Zinc Sulphate and Urea were used as chemical priming agents and both chemical and hydro priming were tested. Germination percentage and growth parameters were taken for getting an idea about the effect of priming. Analysis of variance was done to know about the significant value at 0.05% level and Duncan's Multiple Range Test was done for mean separation. There was a significant effect of priming on the germination percentage but there was no effect on the growth parameters of the seedlings. Further, the values of hydro priming were on par with those of chemical priming. Therefore hydro priming may be the simplest and cost-effective strategy to improve the germination of rubber seeds. Keywords: Germination, Growth , Priming , Urea, Zinc Sulphate