Two-year-old jack pine seedlings of different origin were analyzed for their contents of ash, crude protein, volatile oils, ether extractibles, and alcohol-benzene extractibles. It is suggested that the low content of the alcohol-benzene soluble substances may be correlated with a greater susceptibility of nursery stock to parasitic organisms, and that the contents of ash and protein may serve as indicators of the balance of nursery-soil fertility.
Document Type: Journal Article
Professor of soils (Senior member, S.A.F.), research associate, and assistant in soils, University of Wisconsin, Madison
Publication date: November 1, 1948
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