メロンのマンガン過剰症に関する研究-2-培養液のマンガン濃度とpH〔英文〕

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Muskmelon plants were grown in sand culture and fertilized with a complete nutrient solution containing 1, 10, 20 and 30ppm Mn at pH 4.0 or 6.0. Top growth, fruit weight, and soluble solids at 30ppm Mn were inferior to those below 20ppm Mn regardless of pH levels. External appearance of the fruit became poorer as Mn concentrations were raised from 10 to 30ppm. As Mn concentrations were raised from 1 to 30ppm, Mn toxicity symptoms were intensified, and Mn contents in the plant parts increased, while ratios of Fe: Mn in the leaves decreased. Critical Mn in the leaves for appearance of toxicity symptoms was nearly 2000ppm. Mean Mn content in the leaves and stems at pH 4 was higher than those at pH 6, while Mn content in the roots at pH 6 was much higher than those at pH 4.
園藝學會の論文