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As part of the continuing search for chemicals which stimulate or retard growth of tree species, the growth regulator N, N’-dinitroethylenediamine (EDNA) ² was applied to red cedar ( Juniperus virginiana L.) and to American arborvitae ( Thuja Occidentalis L.). Holmsen ³ reported that low amounts of EDNA stimulated a broad spectrum of growth increas...
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