Abstract
1. The frostbite of the tea plant in the spring 1953 was very severe. We carried out an actual survey and some microclimatic observations.
2. It was colder in this spring compared with the past ten years, the tea garden was often suffered from frost, especially on 15th, 18th and 25th April, the damage was very severe. It was characterized by the severity and frequency in this spring.
3. By observing the air temperture distribution of the place liable to frostbite on a frosty night, we recognized that the air current streamed down from higher place and settled on the place where was not the lowest level in the field but the lowest plants grew.
4. By investigating the vertical distribution of air temperature at the frost pocket, we recognized that the cold air mass stagnated in the bottom.
5. The tea bush under the citrus tree did not suffered from frost than in the open field, and the dew scarcely fell.
6. The shading effect of the early variety of tea plant was noticed from m ?? croclimatic standpoint. The air around the tea bush was kept warm by the covering at night, the growth of the tea shoot was increased, and the qualities of tea were improved by the shading during day-time for a few days before plucking. (July 3, 1953)
