Progress report on solving graft incompatibility and pollen contamination in douglas-fir seed orchards.
In the mid-1960's, the problems of graft incompatibility, pollen contamination and slow and cyclic seed production caused Douglas-fir seed orchards to lose favor. Solutions now appear practical to graft incompatibility through providing compatible rootstocks and to pollen contamination through delaying floral bud development with water spray applications. The problem of slow and cyclic seed production is still unsolved.
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Silen et al. (1972) studied this question.
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