Spring rain makes tea deliciousby 黒田九兵衛
The cherry blossoms are still in bloom, but it rains a lot in spring.
This is because the pressure distribution often changes due to the influence of westerlies. From China, the hot and dry Yangtze River airmass comes on a westerly wind. Also comes the cold pieces of the Siberian airmass that dominated in winter. These are migratory anticyclones. However, when these high pressures do not completely cover the Japanese archipelago, low air pressure from the south can enter and create a front that rains.
According to the statistics of the Tokyo area of the Japan Meteorological Agency, the amount of precipitation in March is 116 mm, which is almost double that in February. And in April, it rains 134 mm in normal years.
This rain makes the tea delicious.
For example, if it doesn't rain during this time by the drought, the plants will not grow. The mechanism of its growth lies in photosynthesis.
Photosynthesis is indispensable as a preparatory step for producing proteins that are the basis of plant growth. Photosynthesis is the work of making starch with the energy of light. Since starch is made up of carbon, oxygen and hydrogen, water absorbed from the roots is essential.
Chlorophyll in the chloroplast absorbs only both with many photons red light and with high frequency energy of bluish-purple light to supply energy to the starch factory.
Furthermore, it absorbs nitrogen in the ground from the roots and uses this starch as a material to make proteins and grow.
It is generally said that May is a time when ultraviolet rays are strong, so people should be careful of sunburn. Certainly, according to the statistics of the Japan Meteorological Agency, the total amount of solar radiation (the amount of solar radiation that falls on the ground) is the highest in May, and the second high is April.
Therefore, the plants grow steadily during this period.
For example, compared to China, the latitude is the same mid-latitude region, so there may be no difference in temperature and amount of solar radiation. However, the soil environment and precipitation are different in China and Japan.
Some tea-producing regions in China are suffering from spring drought, while others are suffering from lack of nitrogen as a natural organic fertilizer and strong acid soil.
Surrounded by the sea on all sides, Japan has the blessings of rain due to the weather factors peculiar to spring, and the conditions for delicious tea are met.