Comparison of methods for estimation of reference evapotranspiration in North-Central Plateau zone of Odisha

Abstract

Estimation of Evapotranspiration is vital role for proper water management and efficient farming activities. A decision support system (DSS_ET) was developed which supports 22 ET0 estimation methods with varied options for calculation of various intermediate parameters. The objective of the study is to estimate ET0 in the North central Plateau zone of Odisha, using weather data of the respective locality and screening of methods to estimate ET0 close to FAO-56 Penman Monteith method. The FAO-24 Penman(c=1) and Turc methods yielded the highest (5.605 mm/day) and the lowest mean ET0 (4.201 mm/day) respectively. For this zone, the highest ET0 values was found to be 10.32 mm/d for FAO-24 Penman(c=1) method followed by Businger-van Bavel (9.73 mm/d) and FAO-PPP-17-Penman (9.68 mm/d) in the month of May, whereas, lowest ET0 value was found in the month of December (2.54 mm/d) for the Priestly-Taylor method followed by 1982 Kimberly-Penman method (3.07 mm/d). Among all the methods, Penman-Monteith and Priestley-Taylor methods were ranked first and tenth respectively. For this zone, correction factor for Penman-Monteith and 1982 Kimberly-Penman methods approaches to one. The FAO-24 Penman (c=1) and Businger-van Bavel methods give more diversion from FAO-56 Penman-Monteith method.

Comparison of some evapotranspiration models using lysimeter measurements in arid climate conditions

“…Djaman et al (2013) reported that ET r values ranged from 0.4 to 12.3 mm d −1 . Other studies have shown ET r values of 2.54–10.32 mm d −1 (Khatua & Pasupalak, 2018), 3.01–5.59 mm d −1 using 16 different mathematical models (Liu et al, 2017) and 1.1–8.0 mm d −1 (Upadhyaya, 2016). There were some differences in seasonal ET values in the different studies.…”

“…However, the accuracy of the reference equations varies widely under different climatic conditions. While some equations result in appropriate ET in specific climatic conditions, some give good results in all climatic conditions (Kashyap & Panda, 2001; Irmak et al, 2003b; Temesgen et al, 2005; Gavilán et al, 2008; Cao et al, 2014; Kar et al, 2017; Liu et al, 2017; Khatua & Pasupalak, 2018). Thus, different and/or the same equations tested sometimes resulted in different results under similar conditions.…”

Influence of Various Soil and Water Conservation Methods on the Moisture Balance at Coffee Plant Root Zone

“…Most of SM is lost through evapotranspiration process (Krishna, 2019). ETo indicates the environmental requirement for evaporation influenced by climatic factors (Katua and Pasupalak, 2018). Meanwhile, ETa shows crop water requirements controlled by climatic and plant factors (Prijono, 2009).…”