In previous units we have discussed the importance of various nursery management techniques to seedling growth and quality. There remain, however, the questions of seedling nutrition in the seed bed, and of harvest and storage techniques which will maintain the quality of the seedlings. And, as we emphasized in previous discussions, careful attention to detail in both seedling nutrition and in the lifting and storing procedures are essential to preserve the quality of planting stock.
This unit will provide a summary of the methodology involved in seedling nutrition and of that involved in harvest and storage of planting stock.
At the end of this unit, you should be able to answer the following questions:
1. What is the principle of balanced nutrition in tree seedlings? Is it true for all species? What element(s) are most limiting in British Columbia and the Pacific Northwest?
2. What time period is most favorable for seedling harvest and storage? If seedlings must be lifted before 1 December or after 1 March, should they be stored?
3. How does a strong moisture stress in seedlings at time of lifting impact their survival potential? How may this be avoided?
4. What are the parameters of storage favorable to seedling vigor? What is freezer storage? When is it a favorable alternative to above freezing storage?
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