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Evaluation the Effif iciency of Simple Equation for Estimating Evapotranspiration and Changes of Soil Moisture in Sugarcane Field |
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| รหัสดีโอไอ | |
| Creator | Preecha Kapetch;Taksina Sansayawichai;Kobkiet Pisancharoen |
| Title | Evaluation the Effif iciency of Simple Equation for Estimating Evapotranspiration and Changes of Soil Moisture in Sugarcane Field |
| Publisher | Department of Agriculture |
| Publication Year | 2559 |
| Journal Title | THAI AGRICULTURAL RESEARCH JOURNAL |
| Journal Vol. | 34 |
| Journal No. | 1 |
| Page no. | 2-12 |
| Keyword | sugarcane, simple equation, evapotranspiration, soil moisture |
| ISSN | 1258389 |
| Abstract | Evapotransiration is a key part for water cycle and can be used as a tool toimprove water use efficiency and increase sugarcane yield. The Penman-Monteith FAO-56(PM-56) has been widely used to estimate the evapotranspiration rate. However, theunavailability of local weather data has largely restricted its application. This studyevaluated the simple equation and linked to water balance model for estimating soilmoisture in the sugarcane field. Soil moisture in sugarcane yield was measured usingTime Domain Reflectometry (TDR) soil moisture sensor and automatically recorded bydata logger. The experiment was conducted in Khon Kaen Field Crops Research Centerduring March to September, 2014. Sugarcane cultivar KK3 was planted in plot site 36x40m with spacing 1.20x0.50 m. After that, simple equations were developed for estimatingevapotranspiration and changes of soil moisture in sugarcane field. Comparison thesimple equation with Penman-Montieth FAO-56 (PM-56) and Priestley-Taylor (PT) forevapotranspiration and compared with experiment and Canegro model for soil moisture.Simple equation performance was evaluated using the statistical parameters such ascofficient of determinatron (R2), root mean square error (RMSE) and normalized root meansquare error (NRMSE). The result showed that the simple equation was excellent forevapotranspiration estimation comparing to PT. The total evapotranspiration was not significantly different from PT equation (2.2%) but lower than PM-56 19.1%. The simple equation was the good estimationof soil moisture with the NRMSE 10.2%. The results indicated that the evapotranspiration and soil moisture in sugarcane field can be estimated by the simple equation. |
