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| Diagnosis of water shortage in key growth period of rice based on canopy temperature |
| ZHAO Yangbo1,2, TONG Daobin3, WANG Jingcai1, ZHOU Mingyao1*, HUANG Qiuge1 |
| 1.School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 3.Water Conservancy Bureau of Sucheng, Suqian, Jiangsu 223800, China; 2.Yangzhou Survey Design Research Institute, Yangzhou, Jiangsu 225002, China |
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Abstract Canopy temperature is an important index to analyze crop water demand. Taking rice in Chuanhang Irrigation Area as the experimental crop, its water requirement was tested at three key stages of rice growth: tillering stage, jointing and booting stage, flowering and fruiting stage from July to October in 2014. This experiment not only studied the relationship between rice canopy temperature, air temperature and soil moisture content but also proposed the diagnosis method of crop water shor-tage. The results showed that the variation trend of canopy temperature in sunny days varied greatly with air temperature, while in rainy days varied little difference. It related to the high evapotranspiration intensity of rice in sunny days and the low evapotranspiration intensity in rainy days. The canopy-air temperature difference in the heading and flowering stage was positive in midday, but negative at other times, while that in the mature stage was positive and maximum at noon. Compared with the canopy-air temperature differences with the appropriate moisture content limits at different stages of rice growing periods, when the canopy-air temperature differences of direct seeding rice and transplanting seeding rice were both greater than 1.5 ℃ in the jointing and booting stage, and they were greater than 2.4 ℃ and 2.5 ℃, respectively, in the flowering and fruiting period, the soil water content reached the crop growing stress level, and the rice should be irrigated. By monitoring canopy temperature, the rice water shortage could be conveniently obtained.
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Received: 01 May 2018
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