Salinity–sodicity relationships of the Kalipatnam drainage pilot area, Godavari Western Delta, India
✍ Scribed by Ch. Sreenivas; Ch. Konda Reddy
- Book ID
- 102284367
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 250 KB
- Volume
- 57
- Category
- Article
- ISSN
- 1531-0353
- DOI
- 10.1002/ird.385
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✦ Synopsis
Abstract
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.