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- W2329718119 abstract "The osmotic pressure of leaves is an indication of coldhardness of a plant, according to the generally accepted theory that very severe frost-injury of plant is resulted from decrease of sugar contained in the plant and therefore weakness of cold-hardness of the palnt which is caused by temporary warmness of the environments occurred occassionally late in the frost season. The measurement of osmotic pressure of tea-leaves was carried out simultaneously with the micrometeorological observation in a tea-garden of Uji City, Kyoto Pref. from March to May 1957.The osmotic pressure of tea-leaves which were nipped in the early morning (06a.m.) of every seven days was measured by the cryoscopic method, and the air temperature was observed by a thermograph set near the plant. Comparison of variation of the osmotic pressure with that of mean air temperature of two days before the tea-leaves nipping day gives the followings:(1) The osmotic pressure is decreasing with increasing air temperature as for the old leaves of the last autumn (19.6atm. at 3.9°C, March 20; 13.8atm. at 17.7°C, April 23).(2) Similar tendency may be found as for the young leaves of this spring, but not always so (7.9atm. at 17.7°C, April 23; 8.8atm, at 15.2°C. May 10) These results show that the osmotic pressure of the young leaves is about 3/5 of that of the old leaves.The singificant diurnal variation of the osmotic pressure of the leaves is seen as the results of 24-hr. observations carried out on May 13-14, 1957. In this observation, the leaf-temperatures in the crown of the plant and the crown surface and the air temperature near the crown surface were also simultaneously measured by thermojunctions. The observed results are shown by the following harmonic terms Osmotic pressure (atm.). P=9.2+1.1sin (σt+241°)+0.2sin(2σt+91°)+……Leaf-temperature (°C) La90=11.8+12.6sin (σt+263°)+0.8sin(2σt+174°)+……Air temperature(°C) Oa90=11.9+12.3sin(σt+263°)+2.1sin(2σt+180°)+……where σ=2π/T(T=24×60×60sec.); t=0 at midnight." @default.
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- W2329718119 date "1958-01-01" @default.
- W2329718119 modified "2023-09-23" @default.
- W2329718119 title "The Osmotic Pressure of Tea-leaves and the Meteorological Conditions of Their Environments Late in the Frost Season" @default.
- W2329718119 doi "https://doi.org/10.2480/agrmet.14.1" @default.
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