Relation of the Environmental Conditions to the Frost Injury:Part 2. Freezing Temperature Influenced by the Wet or Dry Conditions on the Leaf Surface of Soybean Seedlings
スポンサーリンク
概要
- 論文の詳細を見る
In order to examine the effect of dew on the leaf surface on the freezing temperature T1 of plant juice, the experiments were conducted by using the radiative cooling apparatus. When a pair of the primary leaves of a soybean seedling spread fully, the seedling was set in the apparatus and then cooled down to a subzero temperature. The mean freezing temperature of wet leaves T1w was -4.4°C and was 0.8°C higher than that of dry leaves T1d as shown in Table 3. The difference in temperature was significant statistically.When one of a pair of leaves was dry and the other was wet, the wet leaf froze firstly and then the dry leaf froze within a few or longer seconds. The mean freezing temperature of the dry leaves T1dw was -3.9°C as shown in Table 4 and was 1.3°C higher than that of the dry leaves T1d (Table 3) as a result of ice inoculation by freezing of the wet leaf. The mean freezing temperature of the wet leaves T1ww was lower than T1dw as shown in Table 4. It is considered that this difference in freezing temperatures is due to the difference in evaporative cooling between the dry and the wet leaves under low humidity in the experimental cabinet.The multi-regression equation on the frost injury ratio I, the freezing temperature T1 and the minimum leaf temperature T3 after T1 (see Fig. 1) in the previous paper (Yamanaka et al. 1982) was modified by adding the present experimental data taken at the warmer experimental conditions than the former and the following equation was obtained.I=-8.21T1-17.40T3-34.26In analyzing the experimental results, it was found that the frost injury did not occur when the plants were held in the supercooling condition or when the droplets on the leaves froze but plant juice did not freeze or only a part of liquid outside cells froze.
- 日本農業気象学会の論文
日本農業気象学会 | 論文
- 局地気象学における赤外線放射温度計と熱赤外画像計測装置の有効利用
- 局地風(2)冷気の流れ
- 密閉式チャンバー法を用いた夜間の水蒸気フラックスの測定
- カキ'西条'における耐凍性の系統間評価
- 気象条件が花粉飛散を介してトウモロコシの交雑率に与える影響