Effect of different spacing in conventional and controlled sub-surface drainage system on soil salinityand crops yield in saline vertisols of Tunga Bhadra Project command

A.  V.   KAREGOUDAR; M.  NEMICHANDRAPPA; J.  VISWANATH; B. S.  POLISEGOWDAR; M. S.  AYYANAGOWDAR; S. R.  ANAND

A. V. KAREGOUDAR Department of Soil and Water Engineering, College of Agricultural Engineering, RaichurUniversity of Agricultural Sciences, Raichur - 584 104, Karnataka, India
M. NEMICHANDRAPPA Department of Soil and Water Engineering, College of Agricultural Engineering, RaichurUniversity of Agricultural Sciences, Raichur - 584 104, Karnataka, India
J. VISWANATH Department of Soil and Water Engineering, College of Agricultural Engineering, RaichurUniversity of Agricultural Sciences, Raichur - 584 104, Karnataka, India
B. S. POLISEGOWDAR Department of Soil and Water Engineering, College of Agricultural Engineering, RaichurUniversity of Agricultural Sciences, Raichur - 584 104, Karnataka, India
M. S. AYYANAGOWDAR Department of Soil and Water Engineering, College of Agricultural Engineering, RaichurUniversity of Agricultural Sciences, Raichur - 584 104, Karnataka, India
S. R. ANAND Department of Soil and Water Engineering, College of Agricultural Engineering, RaichurUniversity of Agricultural Sciences, Raichur - 584 104, Karnataka, India

Keywords: Controlled drainage, Drain outflow, Nitrogen leaching, Spacing

Abstract

A field Study was conducted (2017-18) to assess the performance of different spacing of conventional subsurface drainage system in comparison with controlled drainage on salinity and crop yield in saline rice fields atARS,Gangavathi of TBP Command. Based on pre-drainage investigation and base line survey the subsurface drainage wasinstalled in an area of 9.42 ha. The treatments consisted of conventional and controlled SSD spacing viz., 40 (2.62 ha), 50(2.8 ha) and 60 m (4.0 ha) each with a lateral depth of 1.0 m. The mean soil salinity (ECe) in all the spacing under bothconventional and controlled drainage system was reduced. The paddy grain yield varied from 33.0 to 46.0 vs. 38.0 to 52.0,36.0 to 55.0 vs. 31.0 to 41.0 and 37.6 to 47.0 vs. 36.0 to 52.0 qha-1 under conventional and controlled SSD at 40, 50 and 60m spacing respectively.