Pressure Variation in Drip Laterals as Affected by Single and Double Inlet Systems and Sub Main Sizes

摘要

Experiments were carried out during three growing seasons of 2011 to 2013 in the farmer's field at village Jamunali of Chhendipada block in the district Angul, Odisha, India. The effect of five different single and double inlet lateral connections with three different commonly available sub-main pipe sizes (40, 50 and 63 mm) on pressure variation along lateral in drip irrigated brinjal (SolanummelongenaL.) crop was studied. The variation of pressure amongst different lateral connections and sub-mainsizes are found to be significant where as the interaction effect was non-significant. Average pressure value was maximum (10.27 m) in case of double inlet system with two sub-mains laid at two sides of the plot. Mean pressure in case of the lateral connection where sub-main was laid at one side of the plot and laterals were laid on one side of the sub-main and closed at the tail end (single inlet type, L1) was minimum (9.78 m) amongst all the lateral connections. It was also observed that when single inlet systems with laterals laid at one side or both sides of the sub-main are converted to the corresponding double inlet systems by looping the laterals, the mean pressure value increased.