メロンのマンガン過剰症に関する研究-3-土壌のpHならびに光度とマンガン過剰との関係〔英文〕

概要

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Muskmelon plants were planted in soils adjusted at 4 pH levels -7.75(high), 6.16 (medium), 5.06 (low), and 4.68 (very low) and grown under light intensities, 70% of day light, and full day light in the greenhouse. Fruit weight and soluble solids decreased as soil pH was lowered from medium to very low. Top dry weight decreased at the very low pH. Mn increased in the leaves, stems and fruits with decreasing soil pH. Toxicity symptoms in the leaf blades, stems and petioles intensified as soil pH was lowered from medium to very low. The water soluble Mn at the high, medium, low and very low pH were 0, 16, 194 and 325ppm, respectively. The high correlation between the fruit growth and Mn content in the plant, and the excessively high level of Mn found in the plant from the low or very low pH suggest that the influence of soil pH on Mn toxicity was most likely an indirect effect of the treatment. However, Al, Ca, Fe and soluble salts also may have been responsible, in part, for the plant and fruit growth. Plant growth and Mn content in the plant except for the fruit were not influenced by light intensities in the greenhouse in this experiment.
園藝學會の論文