Abstract
(1) The estimation of heat balance for plant layers was carried out by using micro-meteorological data obtained on wheat field at night. The vertical distributions of the rate of cooling by long wave radiation, and of heating by eddy transfer of heat and dew formation in the plant layers are calculated. The results shown in Fig. 3.(2) Amount of dew was measured by making use of sanitary cotton as the absorber of dew. The amount was compared with one calculated by heat balance method. From Fig. 5 it seems that dew in wheat field is formed predominantly by water vapour from the air layers above plant surface.(3) Radiative cooling rates of air layers above this plant surface are calculated. Since the calculated cooling rates are larger than actual cooling rates, we can suppose that the air layers are warmed by eddy transfer of heat at night.
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