ICAR-Central Soil Salinity Research Institute, Regional Research Station, Dilkusha P. O., Lucknow-226 002, (U.P.)
Online published on 13 December, 2017.
A field experiment was conducted on unreclaimed sodic soil (pH 10.1) to ascertain the effect of organic and inorganic amendments on rice production and effect of amendments on chemical changes in sodic soil during reclamation. It was observed that maximum reduction in soil pH was in the plots applied with phosphogypsum@25 %GR in combination with pressmud. Sodium content ranged from 12.80 to 19.04 Cmol/kg which in general increased to 20.81 to 29.60 Cmol/kg in lower soil layers. Maximum rice grain yield was observed in phosphogypsum@25% GR + pressmud treatment which was superior by 18.1 and 18.9 per cent compared to gypsum @50% GR and gypsum @25% GR + pressmud, respectively. Maximum wheat yield was obtained in treatment where phosphogypsum@25% GR+ 10t pressmud was applied which was at par with treatment gypsum @ 25% GR + Pressmud+bio-inoculant. Grain yield as well as straw yield was 63.19% and 40.84% higher in combined use of phosphogypsum and pressmud as compared to gypsum above @ 250% GR.
