Design and Evaluation of Low Cost Drip Irrigation System Utilizing Rooftop Rainwater
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Date
2021-08
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The study was conducted at Advanced Centre for Rainfed Agriculture (ACRA), SKUAST-J, Dhiansar (Samba) during the year 2019-2020. Low cost drip irrigation system was designed, fabricated and installed at experimental field under guava (L-49) crop. Rooftop rainwater harvesting system was developed for the source of water to low cost drip irrigation system. Storage Tank (PVC) of 2000 litre capacity was placed at 2.0 m height on angle iron platform. Further, the experiment was laid out in factorial randomized block design. The treatments comprised of four drip irrigation schedules viz., IR40 – drip irrigation at 40 mm ETc, IR60 – drip irrigation at 60 mm ETc, IR80 – drip irrigation at 80 mm ETc, IR100 – drip irrigation at 100 mm ETc and one control (IW/CPE = 1.0). The total rainfall during the study period (July to October) was 507 mm and the maximum monthly rainfall was 424 mm during the August month. The total potential of the rooftop rainwater harvesting system was found to be 62305 litre during the study period. The total amount of water stored and utilised was 7760 litre. It was found out that water required for single irrigation of different treatments was 720, 1080, 1440 and 1800 litres and number of irrigation applied were 3, 2, 1 and 1 for the treatments IR40, IR60, IR80 and IR100 respectively. The total head required for low cost drip irrigation system was worked out to be 1.8 m. Frictional losses of main, laterals, and other fittings and head required for the farthest emitter to operate were found to be 1.16, 43.27, 4.5 and 130 cm respectively. Various parameters such as average emitter discharge (qa), relative emitter discharge (R), standard deviation of emitter flow rate (Sq), coefficient of variation of emitter flow (Cv), statistical uniformity (Us), emission uniformity (Eu) and uniformity coefficient (Uc) were evaluated. The average emitter discharge for the system was found. 3.40 l/h. This was lower than the manufacturer’s specification of 4 l/h. The values obtained for Cv, Us, Eu and Uc were 0.19, 81.37 %, 80.92 % and 83.95 % respectively. The overall performance of Cv, Us, Uc and Eu were very good, good, good and good respectively. The best treatment obtained was IR40. The maximum change found in different growth parameters of guava at the end of study period were 0.36 m, 2.0 cm, 0.22 m, 3.24 m3, 70.68 % and 39 days for plant height, stem girth, plant spread, plant volume, percentage fruit set and duration of flowering respectively.
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Preferred for your work Arya, S. 2021. Design and Evaluation of Low Cost Drip Irrigation System Utilizing Rooftop Rainwater. M.Tech. thesis, Sher-e-Kashmir University of Agricultural sciences and Technology of Jammu, India.