Nitrogen Form and Solution pH Influence Growth and Nutrition of Two Vaccinium Clones

摘要: The effects of pH and N form on growth nutrition blueberry (Vaccinium corymbosum L. x V. angustifolium Ait. CV. Northblue) cranberry (V. macrocarpon Searles) were tested in separate greenhouse hydroponic experiments. A factorial treatment arrangement two levels (4.5 6.5) three forms (NO 3- N, NH 4-N, NH4-N/NO3-N) was used for each clone. Blueberry shoot final dry weight greatest at 4.5, regardless form. In contrast, fresh accumulation higher with NH4-N/NO3-N or NH4-N than NO3-N alone. Cranberry plants receiving alone accumulated low tissue grew relatively poorly both levels. Differences response by these species may be due partially to the environments which they selected. Soil from site where 'Northblue' selected contained high levels; soil commercial 'Searles' bogs had Both root Fe, Levels Fe as much 100 times shoot. Based X-ray microanalysis roots, most appeared precipitated surface iron phosphate. Concentrations Mn shoots roots depended pH. general, highest 6.5 apparently Fe. Most Ericaceous are native acidic vitrification rates cause dominant available plant (Rorison, 1986). Response has been variable. some studies (Cain, 1952; Greidanus et al., 1972; Peterson 1988; Townsend, 1967, 1969), su-