Abstract
Agricultural activities on sloping land need to be supported by an adequate irrigation system such as efficient drip irrigation. This study aims to determine the impact of the slope of the drip irrigation transmission pipe on the uniformity coefficient and volume of irrigation flow. The study used a PVC drip irrigation network. The drip hole spacing was 60 cm with a diameter of 0.5 mm and a transmission network pipe using Ø1/2-inch PVC and irrigation water source from a 200-litre capacity of the tower 3.3 m high. The slope (α) of the test transmission pipes 10°, 20°, 30° and 40° and variations of the water height in the tank of 20 cm, 30cm, and 40cm, with 1, 3 and 5 minutes of dripping time. Data analyzed on uniformity coefficient (Cu), the relationship between the slope of the transmission pipe and the distributions irrigation. The test results show that α=10°- 20° and head 30 cm - 40cm have the best performance with droplet uniformity above 80%. Variations in the slope of the transmission pipe and the distribution of drip irrigation flow have a polynomial regression relationship with an average R-value of 0.6 – 0.99.
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