Assessment of reference evapotranspiration estimation methods in controlled greenhouse conditions
- PDF / 1,460,709 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 66 Downloads / 216 Views
ORIGINAL PAPER
Assessment of reference evapotranspiration estimation methods in controlled greenhouse conditions Hadisseh Rahimikhoob1 · Teymour Sohrabi1 · Mojtaba Delshad2 Received: 4 September 2019 / Accepted: 5 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Precise estimation of reference evapotranspiration ( ETo) is one of the most influential factors in proper irrigation scheduling and water resources management. Over the years, various methods and formula have been developed to estimate E To based on several required variables and assumptions. Accuracy and performance of different E To estimation equations applied for open field differ from those under controlled greenhouse conditions. Considering the microclimate condition of greenhouses, local calibration is required to choose the best and the most accurate method. This study aimed to investigate the performance of different ETo simulation models including one combination, one temperature-based and seven radiation-based methods under the greenhouse conditions. First, computational methods were calibrated by regression analysis. Then, the accuracy of ETo simulation models was compared with that of micro-lysimeter measurements. Statistical indices including coefficient of determination (R2), mean bias error (MBE), root mean square error (RMSE), relative root mean square error (RRMSE) and index of agreement (d) were used for validation and verification. Finally, the general ranking among the models was conducted using the standardized Ranking Performance Index (sPRI). According to the results, Penman–Monteith method with a fixed aerodynamic resistance of 53 s m−1 (with 0.98, − 0.01 mm day−1, 0.07 mm day−1, 0.80% and 0.99 for R2, MBE, RMSE, RRMSE and d statistical indices, respectively) was the best and the most precise method for estimating E To under greenhouse conditions. Turc method, with a cumulative difference of 24.01 mm during the whole simulation period (73 days), underestimated ETo the most under the same conditions.
Introduction Water crisis and water resources scarcity are of the most important issues and challenges in semi-arid and arid regions. Dramatic population growth, global warming and drought pose an additional threat to water and food security globally. Agricultural sector as the main consumer of total water resources utilizes about 70% of freshwater supplies * Hadisseh Rahimikhoob [email protected] Teymour Sohrabi [email protected] Mojtaba Delshad [email protected] 1
Irrigation and Reclamation Engineering Department, College of Agriculture and Natural Resources, University of Tehran, P. O. Box 4111, 31587‑77871 Karaj, Iran
Horticultural Sciences Department, College of Agriculture and Natural Resources, University of Tehran, P. O. Box 4111, 31587‑77871 Karaj, Iran
2
globally (WWAP 2019). So that, sustained efforts need to be made to address water and food security issues through appropriate adaptation strategies and policies. Protected cultivation has been recommended as a suita
Data Loading...
