臭化メチルの土壌くん蒸消毒がメロンとキュウリの臭素吸収に及ぼす影響

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Muskmelons and cucumbers were grown in soil fumigated with methyl bromide (MBr) to determine the effect of MBr on the growth, bromine (Br) content in the plant and the content of water soluble Br in the soil. The dry weight of the whole muskmelon plant was less at 600g/m3MBr, while soluble solids of fruit were slightly higher at this dosage. Br content in muskmelon leaves at 0, 200, 400 and 600g/m3MBr soil treatments was 203, 540, 3663 and 6783ppm, respectively. Br in the musk melon fruit was most concentrated in the pericarp, less concentrated in the outer flesh, and least concentrated in the inner flesh. On a dry matter basis Br content in the inner and outer flesh at 0, 200, 400 and 600g/m3MBr treatments was as follows: the inner flesh was 47, 24, 109 and 228ppm; the outer flesh was 60, 154, 137 and 323ppm, respectively. Growth and yield of cucumbers grown in Iwata loam (IL) having 13.3% clay were not affected by dosage levels of MBr. Br content in the leaves, roots and fruit was significantly increased with increasing amounts of MBr. Growth and yield of cucumbers grown in Takamatsu light clay (TLiC) having 35.8% clay were not affected by dosage levels of MBr. On a dry matter basis Br content in leaves, roots and fruit was markedly higher in TLiC than in IL, and that in fruit at 0, 200, 400 and 800 g/m3 MBr was 202 to 240, 590 to 900, 1080 to 1742, and 1750 to 2788ppm, respectively. Uptake amount of Br by cucumber plants was significantly increased with time at all dosage levels of MBr, while water soluble Br in soil was inversely decreased.
園藝學會の論文

臭化メチルの土壌くん蒸消毒がメロンとキュウリの臭素吸収に及ぼす影響

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