Effect of Different Heating Systems in Cucumber Production Greenhouses in Varamin Region on Crop Yield, Volume and Cost of Gas Consumed

: This research was conducted to study the effect of different heating systems in cucumber production greenhouses in Varamin region, Tehran province, Iran on crop yield, volume and cost of gas consumed. Three types of conventional heating systems, namely the central heating system (including boiler + hot water pipes), gas heater system (including double-walled tank + blower) and traditional furnace system (including ignition chamber + torch + pipes carrying a mixture of hot air and flammable gases) were studied during two consecutive periods of greenhouse cucumber cultivation in the cold season (from January to June), and average values of crop yield, volume and cost of gas consumed were determined separately. Results of the study indicated that the central heating system with the highest crop yield (295 t  ha -1 ), and the lowest volume (100,000 m 3  ha -1 ) and cost (210,000,000 Rials  ha -1 ) of gas consumed was the best and most suitable heating system for greenhouses producing cucumbers in Varamin region and other regions with the same and similar climate as well as regions with active greenhouses in