International Journal of Plant Protection

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Evaluation Of Evaporation Measuring Methods For Reference Evapotranspiration within Greenhouse


Affiliations
1 Institute of Agriculture, Tamil Nadu Agricultural University, Kulmulur, Trichy (T.N.), India
2 Department of Basic Engineering and Applied Sciences, Agriculture Engineering College and Research Institute, Tamil Nadu Agricultural University, Kumulur, Trichy (T.N.), India
3 Water Technology Centre, Tamil Nadu Agricultural University, Coimbatore (T.N.), India
     

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Alternative methods for estimating reference evapotranspiration (ETo) within greenhouses are explored due to the large area occupied by a Class A pan. Based on the locations, the evapotranspiration difference between inside and outside greenhouse varies. Research results about what pan co-efficient (Kp) should be utilized inside the greenhouse are not conclusive. Therefore the main objective of the work was to compare ETo calculated by various methods within and outside a greenhouse. A Class A pan (CAPi), a reduced pan (RPi60cmØ ) and a reduced pan (RPi20cmØ ) were installed inside a greenhouse, and another Class A pan (CAPo) was installed outside. ETo estimates, obtained by CAPi, RPi60cmØ and RPi20cmØ were 54 per cent, 57 per cent and 59 per cent of those estimated by CAPo, respectively. A simple linear regression showed positive coefficients R = 0.76 for the CAPox CAPi , R = 0.96 for the CAPi and the RPi60cmØ , R = 0.98 for the CAPi and the RPi20cm Ø . The study concluded that it is possible to use reduced pans to estimate the ETo inside the greenhouse and replacement of reduced pan would increase the space available for cultivation in the greenhouse.

Keywords

Class a Pan, Reduced Pan20cm Ø, Reduced Pan60cm Ø , Evapotranspiration, Linear Regression.
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  • Evaluation Of Evaporation Measuring Methods For Reference Evapotranspiration within Greenhouse

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Authors

E. Sujitha
Institute of Agriculture, Tamil Nadu Agricultural University, Kulmulur, Trichy (T.N.), India
K. Shanmugasundaram
Department of Basic Engineering and Applied Sciences, Agriculture Engineering College and Research Institute, Tamil Nadu Agricultural University, Kumulur, Trichy (T.N.), India
G. Thiyagarajan
Water Technology Centre, Tamil Nadu Agricultural University, Coimbatore (T.N.), India

Abstract


Alternative methods for estimating reference evapotranspiration (ETo) within greenhouses are explored due to the large area occupied by a Class A pan. Based on the locations, the evapotranspiration difference between inside and outside greenhouse varies. Research results about what pan co-efficient (Kp) should be utilized inside the greenhouse are not conclusive. Therefore the main objective of the work was to compare ETo calculated by various methods within and outside a greenhouse. A Class A pan (CAPi), a reduced pan (RPi60cmØ ) and a reduced pan (RPi20cmØ ) were installed inside a greenhouse, and another Class A pan (CAPo) was installed outside. ETo estimates, obtained by CAPi, RPi60cmØ and RPi20cmØ were 54 per cent, 57 per cent and 59 per cent of those estimated by CAPo, respectively. A simple linear regression showed positive coefficients R = 0.76 for the CAPox CAPi , R = 0.96 for the CAPi and the RPi60cmØ , R = 0.98 for the CAPi and the RPi20cm Ø . The study concluded that it is possible to use reduced pans to estimate the ETo inside the greenhouse and replacement of reduced pan would increase the space available for cultivation in the greenhouse.

Keywords


Class a Pan, Reduced Pan20cm Ø, Reduced Pan60cm Ø , Evapotranspiration, Linear Regression.

References