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Title: Vegetative propagation of Shorea leprosula Miq. by stem cuttings
Author: Aminah, Hamzah
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1995
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The thesis reports new studies on the factors affecting the rooting of single node leafy stem cuttings of Shorea leprosula, a Dipterocarp timber tree native to South East Asia. Several aspects of vegetative propagation were investigated including treatments of the stock plants from which the cuttings were taken, propagation systems and post-severance treatments to cuttings. Stock plants raised in 1 litre pots of forest top soil and sand (3:1), and fertilised every two weeks with 0.5 g per plant of NPK fertiliser (12%N:12%P2O5:17%K2O:2MgO + Trace elements) were suitable for production of cuttings. Cuttings from stock plants raised under low irradiance of 0 to 325 μmol photons m-2s-1 (nominally 10% full sunlight) produced higher rooting and more roots than those from a high irradiance of 0 to 722 μmol photons m-2s-1 (nominally 30% full sunlight). S.leprosula stem cuttings rooted equally well in the mist and non-mist propagation systems as long as a consistently low vapour pressure deficit (VPD) was maintained. A temporary increase in the VPD of more than 0.5 kPa at peak irradiance could be tolerated by S.leprosula cuttings. Cuttings also rooted equally well in media with either low or high water retaining capacity such as river sand, coconut fibre or a mixture of these two media. A diurnal irradiance of 0 to 360 μmol photons m-2s-1 was adequate for rooting but 0 to 98 μmol photons m-2s-1 resulted in low rates of net photosynthesis (Pn) and a much reduced rooting success. In the enclosed mist propagation system, misting every 1 hour with a 1 minute duration of spray, throughout the day and night, provided sufficient moisture to cuttings and maintained mean relative humidity of more than 90%. Cuttings planted in the same system with a 3 hour misting frequency tended to develop water deficit as indicated by low relative water content and stomatal conductance.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available