Increased Cone Production of Young Douglas-Fir Following Nitrogen and Phosphorus Fertilization

Author： Steinbrenner E. C. Duffield J. W. Campbell R. K.

Publisher： Society of American Foresters

ISSN： 0022-1201

Source： Journal of Forestry, Vol.58, Iss.2, 1960-02, pp. : 105-110

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