亜硝酸による茶樹切断細根の褐変と二,三の土壌条件

概要

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As a cause of tea fine root deteriorations, injury by nitrite-N was investigated using excised tea fine roots. When applied to soils, nitrite-N (Potassium nitrite and Sodium nitrite) was so injurious at the concentration of 20-50 ppm as N on weight basis that discoloration occurred in tea fine roots buried in the soils. The fact that the injury also occurred in fine roots sustained above the surface of the soils, indicated that the injury was brought by gaseous NO2-N. Toxity of the water solution of the nitrite-N was very weak. More than 90% of nitrite-N applied to 3 tea soils, however, disappeared from the soils as gaseous ion in 24 hrs and the toxity of the soils brought by the nitrite-N application also passed away in a short period. Though soil temperature and moisture did not affect the clitical concentration so much, the duration period of the soil toxity was retarded by low temperature and high moisture.
日本茶業技術協会の論文