Practical studies on the injuries of Cool Weather in rice plants (VII)

(1) In order to make the effect of water temperature in paddy field on the yield of rice plants, clear, the relation between the yield and water temperature of the paddy field for good and poor harvest years was studied. The results of experiments made under the conditions of different water temperatures but of same air temperatures were also compared.(2) The study indicates that the yield will receive considerable influence by the water temperature of the paddy field.(3) The stage of growth easiest to receive damage by cold water temperature of the paddy field is between the 40th and 5th day preceding the heading date. The relation between the yield of rice plants and water temperature of the paddy field is as shown in Table 8.