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Volume 07
Advances in Crop Science and Technology
ISSN: 2329-8863
Agri 2019
August 15-16, 2019
conference
series
.com
August 15-16, 2019 | Rome, Italy
14
th
International Conference on
Agriculture & Horticulture
Page 24
Junzeng Xu, Adv Crop Sci Tech 2019, Volume 07
An application on rice of reasonably using canopy temperature to improve the precision of
water stress monitoring
C
rop water stress index (CWSI) has been recognized as a water stress indicator and as a potential tool for irrigation
scheduling. In present study, CWSI calculated based minimizing the low temperature impact was suitable to improve
the precision of water stress monitoring. Thermal images were taken with FLIR thermal infrared imager at 14:00. Upper,
sunlit and non-covered temperatures derived from canopy images, and canopy temperature cumulative frequency curves
were discovered as discrete distribution under different degrees of water stress. CWSI used canopy temperature as the
main driver for evaluation, and was calculated based on average temperature over a certain quantile. Regression equation
between different CWSI and photosynthetic activity were built to find which one is the most sensitive index. Statistical
analysis revealed that higher correlation coefficients were found after minimizing the low temperature. Further, the most
sensitive CWSI also showed better relation to root soil moisture. CWSI thresholds were redefined. Optimal diagnose of
the water stress was based on reasonably using canopy temperature. The results of this study were promising in precise
irrigation scheduling.
Junzeng Xu
Hohai University, China