Subsurface drainage in a pilot area in Nagarjuna Sagar right canal command, India

摘要: Subsurface pipe and open drainage systems were installed in 8 5 ha area, respectively farmers’ fields at Konanki pilot area Nagarjuna Sagar project right canal command India the year 1999 to combat problems of waterlogging (depth water table, 0–3.7 m), salinity sodicity (ECe, 1.3–18.6 dS/m; pH, 7.2–10.0 ESP, 14.1–54.6). Two types envelope materials, nylon mesh geo-textile used two spacings 30 m (design spacing) 60 (double design adopted for system. The analysis discharge data from individual drains revealed that among both spacings, enveloped with performed better (0.45–1.85 mm/day), when compared those (0.25–0.86 mm/day). effectiveness control has been monitored through a network 61 observation wells. groundwater which be almost ground surface during main crop season (October–February) before installation systems, could lowered by 0.2–0.35 due systems. A total 50.4 (@ 6.3 tons/ha) 115.6 tons 23.1 salts have disposed period 3 years (1999–2002).