Greenhouse Evaporation Measuring Methods for Estimation of Reference Evapotranspiration

Various methods for estimating reference evapotranspiration (ETo) within greenhouses are used due to the large area occupied by a Class A pan. The depth of evapotranspiration is influenced by spatial changes. The findings of the research on what pan coefficient (Kp) should be used inside the greenhouse are inconclusive. As a result, the primary goal of the study was to compare ETo calculated by different methods inside and outside of a greenhouse. A Class A pan (CAPi), a reduced pan (RPi60cm), and a reduced pan (RPi20cm) were installed inside a greenhouse, and another Class A pan (CAPi) was installed outside. Outside, a pan (CAPo) was installed. ETo estimates obtained by CAPi, RPi60cm, and RPi20cm were 54%, 57%, and 59% of those estimated by CAPo, respectively. A simple linear regression revealed R = 0.76 for the CAPo x CAPi, R = 0.96 for the CAPi and the RPi60cm, and R = 0.98 for the CAPi and the RPi 20cm. For the specific conditions in this study, it is recommended that a reduced pan be used as a replacement for the class A pan to estimate ETo inside the greenhouse, as long as the equations adjusted in this experiment are used. The study discovered that reduced pans can be used to estimate ETo inside the greenhouse, and that replacing reduced pans increases the amount of greenhouse area available for cultivation.

Author (S) Details

E. Sujitha
Institute of Agriculture, Tamil Nadu Agricultural University, Kulmulur, Trichy, India.

K. Shanmugasundaram
Department of Basic Engineering & Applied Sciences, Agriculture Engineering College and Research Institute, Tamil Nadu Agricultural University, Kumulur, Trichy, India.

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