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Controlling water dynamics in Scots pine (Pinus sylvestris L.) seeds before and during seedling emergence

Pamuk, Gunnar Sven (2004). Controlling water dynamics in Scots pine (Pinus sylvestris L.) seeds before and during seedling emergence. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 ; 305
ISBN 91-576-6539-7
[Doctoral thesis]

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This doctoral thesis examines if water dynamics before and during seedling emergence after autumn and summer direct seeding can be controlled in Scots pine (Pinus sylvestris L.) seeds by hydrophobic polymer coating and hydrophilic (hydrogels) polymer packages. A method was created by using scanning electron microscopy (SEM) to evaluate the quality of the polymer seed coating. Differential scanning calorimetry (DSC) and germination tests indicated that the critical moisture content of Scots pine seeds under freezing conditions was between 15%-20%. After autumn seeding, the coating (Ethocel™ polymer) thickness that resulted in the highest seedling emergence was 2.0% weight gain. On three seeding sites this treatment resulted in seedling emergence of 33.7%, 30.0%, and 14.1%, whereas the uncoated seeds had values of only 12.3%, 0.0%, and 1.0%. Summer direct seeding was done with three different scarification techniques - organic removal, huminmix, and mounding. Seedling emergence was compared within each scarification type for different initial seed moistures (dry and invigorated 30% moisture content, not re-dried), soil preparations (2-cm indentation, 2-cm wick and, 6-cm wick), and polymer (hydrogel Ac-Di-Sol®) preparations (powder, gel, and gel/peat). The highest seedling emergence was associated with invigorated seeds prepared with gel/peat package and a 6-cm wick for organic removal (32.5%), huminmix (30.7%) and mounding (18.8%). Invigorated seeds, regardless of treatment, had seedling emergence higher than dry seeds, and control values of dry seeds were significantly lower than for invigorated seeds. The delay of water uptake (probably in combination with sufficient snow cover insulation during winter months) made autumn direct seeding of coated seeds successful. The use of hydrogels, seed invigoration (not re-dried seeds), and soil preparation/wicks improved seedling emergence after summer direct seeding in dry conditions.

Authors/Creators:Pamuk, Gunnar Sven
Title:Controlling water dynamics in Scots pine (Pinus sylvestris L.) seeds before and during seedling emergence
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :March 2004
Number of Pages:29
ALLI. Pamuk, G.S., Olsson, T., Bergsten, U., and Lindberg, H. 2002. Evaluation of polymer coating on Scots pine (Pinus sylvestris) seeds using scanning electron microscopy (SEM). Seed Sci. and Technol. 30: 167-176. II. Pamuk, G.S., Bergsten, U., and Lingois, P. 2003. Freezing response in Scots pine seeds as assessed by DSC and germination test. Seed Technology 25(2): 92-103. III. Pamuk, G.S. and Bergsten, U. Autumn direct seeding of Scots pine (Pinus sylvestris L.) seeds using Ethyl cellulose coating. (Submitted manuscript). IV. Pamuk, G.S. Effects of hydrogels, seed invigoration, and soil preparation on seedling emergence of direct seeded Scots pine (Pinus sylvestris L.) seeds during a warm and dry summer. (Manuscript).
Place of Publication:Umeå
ISBN for printed version:91-576-6539-7
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
Subjects:Not in use, please see Agris categories
Agrovoc terms:direct sowing, seed pelleting, freezing, seedlings, site preparation, water uptake, pinus sylvestris
Keywords:direct seeding, seed coating, freezing response, seed invigoration, microsite preparation, seedling emergence
Permanent URL:
ID Code:492
Department:(S) > Institutionen för skogsskötsel
Deposited By: Gunnar Pamuk
Deposited On:15 Mar 2004 00:00
Metadata Last Modified:02 Dec 2014 10:05

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