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Estimation of Actual Evapotranspiration and Crop Coefficient of Transplanted Puddled Rice Using a Modified Non-Weighing

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Title Estimation of Actual Evapotranspiration and Crop Coefficient of Transplanted Puddled Rice Using a Modified Non-Weighing
 
Creator Arti Kumari
Ashutosh Upadhyaya (Acting Director)
Pawan Jeet
Prem Kumar Sundaram
Kirti Saurabh
Ved Prakash
Anil Kumar Singh
Rohan Kumar Raman
Jitendra Rajput
 
Subject crop growth stages,reference evapotranspiration,pan evaporation,irrigation scheduling
 
Description Not Available
A lysimeter and eddy covariance can be used to estimate actual evapotranspiration (AETc,) directly. However, these technologies are costly, making in-situ ET determination difficult, particularly in developing countries. In view of this, an attempt was made to determine AETc, and stage-wise crop coefficients (Kc) of transplanted puddled rice using a modified non-weighing paddy lysimeter. The results were compared to indirect methods using FAO Penman-Monteith and Pan Evaporation. Daily AETc, ranged from 1.9 to 8.2 mm/day, with a mean of 4.02? 1.35 mm/day, and their com-parison showed that the FAO Penman-Monteith equation performed well (R2:0.63; MSE: 0.64; RMSE: 0.80) and was highly correlated with AETc, throughout the crop season. However, the Pan evaporation approach was underestimated (R2=0.24; MSE=0.96; RMSE=0.98) due to a consistent pan coefficient (0.71), vegetation role and human error. In addition, Actual Kc values were de-termined to be 1.13, 1.27, 1.23, and 0.93, respectively, for the initial, crop development, mid-season and end season, higher than FAO Kc. Statistical analysis results revealed that the overall stage-wise derived Kc was in line with FAO values (R2= 0.97; p= 0.45) but different from derived pan Kc values (R2= 0.93; p= 0.33), although insignificant at 5% significance level. Therefore, such a methodology should be used without lysimeter availability. The derived regional Kc values may be utilized for precise irrigation scheduling to enhance paddy water productivity in similar agro-climatic regions worldwide.
 
Date 2023-07-17T10:22:13Z
2023-07-17T10:22:13Z
2022-11-15
 
Type Research Paper
 
Identifier —
Not Available
2073-4395
http://krishi.icar.gov.in/jspui/handle/123456789/80133
 
Language English
 
Relation —
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Publisher Not Available