Structural analysis of polyhouses and tensiometer based drip irrigation scheduling of off-season cucumber in Pantnagar tarai condition of Uttarakahnd
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Date
2013-05
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present study was undertaken to investigate the “Structural Analysis of Polyhouses and Tensiometer Based Drip Irrigation Scheduling of Off-season Cucumber in Pantnagar Tarai Condition of Uttrakhand”. To meet the first objective study was carried out to determine the structural characteristic of six polyhouse located in Pantnagar tarai condition of Uttarakhand. Polyhouse enterprises are widely common in the plain and hilly area of Uttarakhand for growing cutflower and other off-season vegetable cultivation. Information about polyhouse types, material properties, placement and arrangement in the study area was gathered by actual measurement on the site. Loads acting on the trusses of polyhouses were analysed by joint method. On the basis of this analysis compression and tension forces of all trusses were determined to get the safe load of each and every members of polyhouse trusses. Another aspect of the study was to see the response of cucumber to different irrigation levels and fertigation scheduling under a double span naturally ventilated polyhouse. The study was conducted at the experimental site of the Department of Irrigation and Drainage Engineering, College of Technology, G. B. Pant University of Agriculture and Technology, Pantnagar. The study also included to investigate the economic feasibility of cucumber production under the polyhouse for its off-season production. During the five months of growing period in DS NVPH the average depth of water applied in the irrigation treatment in which the soil moisture regimes was maintained at 20-30 kPa level was 104.2 mm, at 30-50 kPa was 112.2 mm and at 50-70 kPa level was 92.4 mm, whereas in conventional practice (control), depth of irrigation was 155.2 mm. Production of the mean value of cucumber at irrigation treatment of 20-30 kPa, 30-50 kPa, 50-70 kPa and control has been found to be 8.50, 10.60, 12.04 and 6.05 kg/m2 respectively. The average water productivity for cucumber at irrigation levels 20-30 kPa, 30-50 kPa, 50-70 kPa and control were 29.55, 24.39, 25.10 and 41.15 litre/kg, respectively. Production of off-season cucumber under tensiometer based different drip and fertigation treatment was economically feasible at selling price higher than 20 `/kg. However, the production of cucumber under the control (conventional surface irrigation and fertilizer application) was economically feasible at selling price of `30/kg.
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