|Author:||Ravender, Singh ; Kundu, D. K.|
|Book Group Author:||NA|
The leaching requirement of three salt-affected soils (Typic Chromustert, Vertic Ustochrept and Paralithic Ustochrept), occurring in the Bhal region of Gujarat, India, was studied in PVC columns of 0.35 m length and 0.108 m internal diameter. Air-dried soils, ground and passed through a 2 mm sieve, were packed to a bulk density of 1.5±0.2 t m-3 in the PVC columns, and different amounts of water were passed through them. Leaching with 2.3 pore volumes of water removed 94% of total salts and brought down the ECe (electrical conductivity of saturation extracts of the soils before leaching) to less than 4 dS m-1 in the 0 to 30 cm layer of the Vertic Ustochrept. To bring down the ECe to below 4 dS m-1 in the 0 to 30 cm layer of the Typic Chromustert, leaching with 2.8 pore volumes of water was required. The leaching treatment removed 97% of total salt from the soil layer. Leaching with 2.6 pore volumes of water in the Paralithic Ustochrept brought down the ECe to below 4 dS m-1 in the 0 to 25 cm layer only by removing 97% of the total salts. The following relationships between EC/ECo (EC is the electrical conductivity of saturation extracts of the soils after leaching) and Dw/Ds (Dw and Ds are the depth of water and soil, respectively) were established for the soils: EC/ECo=0.1045 (Dw/Ds)-1.7096, r=-0.8486 for Typic Chromustert; EC/ECo=0.1450 (Dw/Ds)-1.4551, r=-0.9658 for Vertic Ustochrept; and EC/ECo=0.113 (Dw/Ds)-1.5496, r=-0.9339 for Paralithic Ustochrept. These relationships suggest that to accomplish an 80% reduction in salinity, each centimetre of Typic Chromustert, Vertic Ustochrept and Paralithic Ustochrept should be leached with 0.64, 0.80 and 0.69 cm water, respectively.
|Pages:||421 - 426|
|Journal:||Journal of the Indian Society of Soil Science|
depth, distribution, electrical conductivity, Inceptisols,leaching, leaching requirement, saline soils, salts in soil, soil depth,soil salinity, Vertisols, water, Gujarat, India, India, South Asia,Asia, Developing Countries, Commonwealth of Nations, Soil Chemistry andMineralogy (JJ200), Soil Morphology, Formation and Classification(JJ400), Soil Physics (JJ300), Soil Water Management (Irrigation andDrainage) (JJ800) (Revised June 2002) [formerly Soil Water Management]