茶樹による冬期施肥窒素の吸収

概要

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15N labeled ammonium sulfate was applied to a young pot-planted tea, on January 14th, February 14th and March 13th. The plant matters, sampled a month after the applications and at the time of 1st crop, April 8th, were analyzed to determine the total nitrogen content and the percentage of 15N. The fertilized nitrogn was evidently absorbed by a tea plant at the colder periods, in January to February and February to March, and increasingly absorbed at the warmer period from March to April when new shoots had grown up. The fertilized nitrogen was incorporated more in a new shoot and less in a root as the application time was closer to 1st crop, with regard to the distributions of the fertilized nitrogen at the harvest time. From the above results, it could be concluded that the fertilized nitrogen in the early to the late February by the customary method, was greatly absorbed by a tea after the middle of March.
日本茶業技術協会の論文