Evapotranspiration Based Micro Irrigation Scheduling of Tomato Crop under Naturally Ventilated Polyhouse

Abstract

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 ET 0 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 ET 0 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 ET 0 under polyhouse. Whereas, FAO Radiation and Stanghellini model observed to be most and the least appropriate models in open environment for estimating daily ET 0 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, Original Research Article 2 ), water use efficiency (135.26 kg/m 3 ) and maximum fruit weight (106.66 gm).

Combinatorial Effect of Fertigation Rate and Scheduling on Tomato Performance under Naturally Ventilated Polyhouse in Indian Humid Sub-Tropics

“…Vankooten et al [32] proclaimed that the water use efficiency in protected cultivation structures is very high, while it is affected by numerous aspects, comprising region, structures, the type of soil, the plant species, and the agronomic practices. Sagar et al [33] compared the water demands under a polyhouse to that of open environments for growing tomatoes. In their study, the average water needs for tomato were 0.2149 and 0.2924 L per day per plant, respectively; demonstrating that the water that was supplied in the polyhouse was 30% less than that of the open environment.…”

Design and Performance of Subsurface Irrigation Using Porous Emitters for Tomato (Solanum Lycopersicum, L.)

“…Therefore, the provision of irrigation water at intervals of one day requires 3.5-8 liters of water. Water productivity is the amount of water used to produce evapotranspiration in an open environment [33].…”