Chemical Cultivation in Cottonwood Seed-Source Plantings
It is certainly unnecessary to review here the literature relating to the need for maintenance of "free space" around newly established cottonwood plantings. Even a bare minimum of experience in cottonwood culture is ordinarily sufficient to impress one with the fact that the young tree absolutely requires at least a one year advantage over its competition if it is to survive. On the other hand, it is not fully known how many years of such intensive care are necessary and what growth advantages might possibly accrue from extended periods of treatment. It certainly is obvious to the economically biased American forester, however, that cottonwood care is expensive and that the young trees should be encouraged to go-it-alone just as quickly as possible.
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Author(s): Clair Merritt
Publication: Tree Improvement and Genetics - Central States Forest Tree Improvement Conference - 1964