Technical Report
 

Mycorrhizae and survival of Douglas-fir seedlings

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  • Correlation was sought between abundance of mycorrhizae on Douglas-fir seedlings and their survival in field plantations. One possible indication of dormancy desirable for lifting from nursery beds could be the varying seasonal abundance of ectotrophic mycorrhizae on roots of seedlings. No direct correlation between percentage of mycorrhizae and survival in field was found; however, a conclusion was that when 60 per cent or more of the roots of seedlings have mycorrhizae. survival in field is enhanced, and reforestation should be aided. Data interpreted here, and in a concurrent study by Lavender, should aid in selecting favorable periods for lifting and planting Douglas-fir.
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