Optimizing Soil Moisture in Subsurface Irrigation System Based on Porous Clay Capsule Technique

Water, a limited resource in most parts of the world, has always been threat to arid and semi-arid zones. Using sub-irrigation method with clay capsule technique is one practical strategies for conserving water reducing consumption areas. A porous pipes system that can release near root zone. This paper attempted improve physical hydraulic properties capsules based on changing percentage organic matter raw material (G0). The used making obtained from calcareous soil Nasr Abad village Gorgan, Iran. ratio rice bran husk flour G0 as improving was 1:2, 1:5, 1: 10, 1:15, 1:20 (kg kg air-dried soil). produced were named G2, G5, G10, G15, G20 respectively. discharge distribution measured at 25, 50, 80, 100 kPa hydrostatic pressures discharge-pressure automation instrument. findings revealed positive significant relationship between increasing levels capsules. Unlike G2 discharges pressure linear G20. Meanwhile, wetting shape followed spherical trend due slow seepage However, soil-wetting shapes trended vertical ellipsoids G5 G2. high importance irrigating plants, especially regions, efficiently manage shortage problem.