Effects of Water Layer on Microclimate in Paddy Field and Heat Damage Defense of Rice

doi:10.11923/j.issn.2095-4050.cjas2022-0137

Abstract

Abstract:

Heat damage is one of the main meteorological disasters affecting rice yield and quality, scientific prevention of high temperature is of great significance to the safe production of rice. In this research, the temperature of paddy field and lake surface was observed and compared with the data from meteorological observation stations nearby. The results showed that the daily maximum water temperature in the three-leaf stage and tillering stage was 2-3℃ higher than that of air temperature of paddy field, but in the heading stage, the result was the opposite. The D-value of T_max in paddy field and meteorological observation station was negatively correlated with sunshine hours, so was the D-value of the mean temperature between the two underlying surfaces. The D-value of T_max in water surface and meteorological observation station was positively correlated with sunshine hours, so was the D-value of the mean temperature between the two underlying surfaces. The D-value of T_min in water surface and paddy field and meteorological observation station was positively correlated with sunshine hours too. Research showed that, when there was water in the paddy field, rice leaves could reflect solar radiation and increase evapotranspiration to reduce paddy field temperature, then the heat damage could be alleviated. In addition, heat damage alleviation could be achieved by shallow water in the paddy field, there is no need of flood irrigation.

Key words: rice, microclimate, sunshine

HAN Lu, LIU Kequn, ZENG Kai. Effects of Water Layer on Microclimate in Paddy Field and Heat Damage Defense of Rice[J]. Journal of Agriculture, 2023, 13(7): 1-6.

Figures/Tables 4

References 29

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