Main Article Content
The present study was undertaken to investigate the Evapotranspiration Based Micro Irrigation Scheduling of Tomato Crop under Naturally Ventilated Polyhouse, at experimental field of Department of Irrigation and Drainage Engineering, G. B. Pant University of Agriculture & Technology, Pantnagar, Uttarakhand during 2017-18. The average of mean monthly ET0 estimated under polyhouse by FAO-PM (benchmark) model was 39.44 mm, but that of the FAO Penman, Hargreaves, Stanghellini, Priestley-Taylor and FAO Radiation models were 38.37, 18.18, 37.80, 48.17 and 53.87 mm, respectively. Whereas, the average of mean monthly ET0 estimated under open environment by FAO-PM (benchmark) model was 116.34 mm, but that of the FAO Penman, Hargreaves, Stanghellini, Priestley-Taylor and FAO Radiation models were 119.33, 133, 126.41, 113.17 and 117.37 mm, respectively. The FAO Penman and Hargreaves model are found to be most and least appropriate models for estimating daily ET0 under polyhouse. Whereas, FAO Radiation and Stanghellini model observed to be most and the least appropriate models in open environment for estimating daily ET0 under polyhouse for the Pantnagar tarai condition of Uttarakhand. During the six month growing period, the average water requirement for tomato crop under polyhouse and open environments were 0.2149 and 0.2924 liter per day per plant, respectively, showing that the water requirement in the open environment was estimated as 30% higher than that of polyhouse. The experimental results also revealed that the treatment T2 (100% water application of ETc without mulch under polyhouse) recorded significant yield (18.97 kg/m2), water use efficiency (135.26 kg/m3) and maximum fruit weight (106.66 gm).
Singh VK, Tiwari KN, Santosh DT. Estimation of crop coefficient and water requirement of Dutch roses (Rosa hybrida) under greenhouse and open field conditions. Irrigat Drainage Sys Eng. 2016;5(169):2.
Tiwari KN, Kumar M, Santosh DT, Singh VK, Maji MK. Influence of drip irrigation and plastic mulch on yield of Sapota (Achras zapota) and soil nutrients. Irrigation and Drainage Sys Eng. 2014;3:116.
Oudin L, Hervieu F, Michel C, Perrin C, Andréassian V, Anctil F, Loumagne C. Which potential evapotranspiration input for a lumped rainfall–runoff model. Part2- Towards a simple and efficient potential evapotranspiration model for rainfall–runoff modelling. Journal of Hydrology. 2005;303(1-4):290-306.
Tegos A, Malamos N, Koutsoyiannis D. A parsimonious regional parametric evapo-transpiration model based on a simplification of the Penman–Monteith formula. Journal of Hydrology. 2015;524: 708-717.
McMahon TA, Finlayson BL, Peel MC. Historical developments of models for estimating evaporation using standard meteorological data. Wiley Interdisciplinary Reviews: Water. 2016;3(6):788-818.
Willmott CJ. On the evaluation of model performance in physical geography. The Netherlands. 1984;443-460.
Legates DR, McCabe GJ. Evaluating the use of “goodness of fit” measures in hydrologic and hydroclimatic model validation. Water Resour. Res. 1999;35(1): 233-241.
Jhajharia D, Deb Barma S, Agrawal G. Comparison of pan evaporation-based reference evapotranspiration model with Penman Monteith FAO-56 model. Journal of Agricultural Engineering. 2004;41(3):46-52.
Jhajharia D, DebBarma S, Agrawal G. Comparison of simpler radiation-based ET models with Penman Monteith model for humid region. Journal of Agricultural Engineering. 2004;41(4):32-36.
Moazed H, Ghaemi AA, Rafiee MR. Evaluation of several reference evapotranspiration methods: A comparative study of greenhouse and outdoor conditions. Iranian Journal of Science and Technology. Transactions of Civil Engineering. 2014;38(C2):421.