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The effect of N form on the development of chlorosis was examined on rabbiteye blueberry plants grown at pHs regulated with little variation. One-year-old rooted cuttings were grown in flowing solution culture. Treatments were composed of combinations of 3 forms of N (NH4, NH4N03 and N03) and 2 levels of pH (4 and 6). Each treatment was applied to 5 plants in separate 3.5 l root compartments in a 75 l reservoir. The pH of the solution in the reservoir was adjusted to the initial value once a day. At pH 6, chlorosis developed on NH4or NH4N03-fed plants 2 to 3 weeks after initiation of the treatment, but not on N03-fed ones. The growth of shoots and roots was poorer at pH 6 than at pH 4 with all forms of N. Dry weight of young leaves and stems was not different among N forms at pH 6 but at pH 4 it was greater for NH4-fed plants than for N03-fed ones. No significant difference was found in Fe concentration of young leaves between chlorotic and healthy plants, although chlorophyll content was closely related to Fe concentration. P concentration and P/Fe ratio of young leaves were higher for chlorotic plants than for healthy ones.

Effect of pH and N Form on the Development of Chlorosis in Rabbiteye Blueberry