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| Modeling and testing of tea tree water stress |
| SUN Daozong1,2, WANG Weixing1,2, TANG Jinchi3, JIANG Sheng2 |
| 1.Key Laboratory of Key Technology on Agricultural Machine and Equipment(SCAU), Ministry of Education, Guangzhou, Guangdong 510642, China; 2. College of Electronic Engineering, South China Agricultural University, Guangzhou, Guangdong 510642, China; 3. Tea Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, Guangdong 510640, China |
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Abstract The canopy temperature, air temperature and humidity, soil heat flux, soil moisture, net solar radiation, wind speed and other factors are observed when tea trees are growing in a greenhouse under different irrigation conditions in winter and spring, then a lower limit equation of canopy temperature difference is determined by using the Idso empirical model. Finally, the curves for representing tea tree moisture content status are obtained by observing the diurnal and seasonal variation curves of tea crop water stress index(CWSI)under different moisture contents. Additionally, the difference in CWSI between Jackson theoretical model and Idso empirical model is analyzed. Since drought often happens in spring and winter in South China, the field data are collected manually in September-December and January-March next year. The various parameters related to CWSI are extracted, and the water stress index models for winter and spring are developed, respectively. The results reveal that there is no significant difference in tea tree water stress index models between winter and spring. In winter, the coefficients A and B in the model are 1.265 and -0.220, while they are 1.230 and -0.214 in spring. It may be because the tea tree is perennial crop and the leaf area index is similar in spring and winter.
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Received: 16 November 2015
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