Evapotranspiration based irrigation scheduling of tomato crop under naturally ventilated polyhouse
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Date
2018-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present study was undertaken to investigate the “Evapotranspiration based Irrigation Scheduling of Tomato Crop under Naturally Ventilated Polyhouse”. The site is located at experimental field of Department of Irrigation and Drainage Engineering, G. B. Pant University of Agriculture & Technology, Pantnagar, Uttarakhand. Studying of different models to estimate reference evapotranspiration and water requirements, the response of evapotranspiration based different irrigation levels on the biometric growth and yield of tomato and economic feasibility of tomato production under polyhouse and open environment were undertaken during the study. The average of mean monthly ET0estimated 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 ET0estimated 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 environment were 0.2149 liter per day per plant and 0.2924 liter per day per plant respectively shows that the water requirement in open environment was estimated as 30 % higher than that of polyhouse. The field experiments under polyhouse and open environment were carried out at different level of evapotranspiration based irrigation with or without mulching in randomized block design having nine treatments replicated thrice. The data observed are plant height, stem diameter, number of leaves per plant, leaf area index, internodes length at 30, 60, 90, 120, 150 and 180 DAT. The experimental results revealed that the treatment T2 (100 % water application of ETc without mulch under polyhouse)recorded significant yield (18.97kg/m2), water use efficiency (135.26 kg/m3)and maximum fruit weight (106.66 gm). Production of tomato under polyhouse and open environment were economically feasible at selling price from Rs 15/kg.
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