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Home Publications National Nursery Proceedings 1984 The effect of sowing depth and mulch on germination

The effect of sowing depth and mulch on germination

The effect of three sowing depths (surface, 1/4 inch, and 1/2 inch) and four mulches (sand, hydromulch, fresh alder sawdust, composted alder sawdust) on germination and 1+0 growth of Douglas-fir 252-1.0 seedlings was evaluated at International Paper Company's Western Forest Research Center near Lebanon, Oregon. Germination percent, 1+0 seedling bed density, and 1+0 diameter were best for seed sown at 1/4 inch soil depth. 1+0 seedling shoot height and oven-dry shoot weight were best for seed sown on the surface or at 1/4 inch depth. The poorest performance resulted from seed sown at 1/2 inch soil depth. Germination rate was not affected by sowing depth. Mulching with alder sawdust modified soil temperatures in the seed zone which significantly increased seed germination and 1+0 shoot development relative to other mulches tested. Seed covered with hydromulch experienced colder soil temperatures producing the poorest germination rate and percent.


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Author(s): Ralph D. Guariglia, Barbara E. Thompson

Publication: National Nursery Proceedings - 1984

Event: Western Forest Nursery Council-Intermountain Nurseryman's Association
1984 - Coeur d'Alene, ID

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