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Salinity–sodicity relationships of the Kalipatnam drainage pilot area, Godavari Western Delta, India
Author(s) -
Sreenivas Ch.,
Reddy Ch. Konda
Publication year - 2008
Publication title -
irrigation and drainage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 38
eISSN - 1531-0361
pISSN - 1531-0353
DOI - 10.1002/ird.385
Subject(s) - salinity , soil water , drainage , soil salinity , loam , leaching (pedology) , soil salinity control , leaching model , environmental science , irrigation , water table , hydrology (agriculture) , well drainage , soil science , geology , agronomy , groundwater , ecology , geotechnical engineering , oceanography , biology
The present study was conducted to characterize the nature of salinity, to understand the relationship between pH, EC, Ca, SAR and ESP and to develop leaching curves for the Kalipatnam drainage pilot area, India. Soils are saline sodic. A relation was developed between the ECe and EC 5 for routine soil analysis. A negative correlation was observed between pH and salinity. A regression equation was developed between SAR and ECe of the soils. Variations in soluble Ca 2+ ion concentrations between soils were negatively related to soil pH and positively related to soil salinity. A negative relation was observed between organic carbon and ESP. Gapon's coefficient for these soils is 0.031 with a negative intercept of −0.499. Water requirements for leaching of saline soils of the Kalipatnam drainage pilot area were estimated. An irrigation depth of 30 cm leached about 50% of salts only in clay and sandy loam soils. The plateau after 50% salt reduction can be attributed to a shallow water table (40 cm only). Empirical equations are not useful for these soil conditions for predicting desalinization pattern. Leaching curves developed based on Y and DW/DS, where Y = ECf − ECeq/ECi − ECeq will give better estimates than other relations. Copyright © 2008 John Wiley & Sons, Ltd.