Browsing by Author "Chappell, Henry Nixon"

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    Responses of Quercus alba L. seedlings to fertilization with nitrogen and phosphorus
    Chappell, Henry Nixon (Virginia Polytechnic Institute and State University, 1975)
    Effects of fertilization with diammonium phosphate on growth and foliar N and P concentrations of 1-0 Quercus alba seedlings were evaluated one year after planting and fertilization. Soil P tests were made by three methods: dilute acid extractable P (Mehlich), acid flouride extractable P (Bray no. 1), and total P by perchloric acid digestion. Correlation analyses were performed on seedling growth, foliar P content, and soil P tests. Confounding factors, including site variation, seedling stress resulting from planting, and an equilibration period of only one growing season, suggest that first-year results are inconclusive. Site factors were the most common source of variation for growth and soil P measurements. Dilute acid extractable P was significantly correlated with height growth. Correlations of first-year responses may be obscured by factors discussed.