Shrink-Swell Soils of Rice-based Cropping System of Old Deltaic Plains, Tamil Nadu: Their Characterization and Classification
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Authors
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M. Lalitha
Keywords:
Rice-growing soils, Old deltaic plain, shrink-swell soils, characterization and classification, sub-soil sodicityAbstract
Two typifying pedons representing the Olimathi and Naramangalam series in rice-growing shrink-swell
soils of the old deltaic plains of Tamil Nadu were characterized for their physical, chemical, and nutrient
properties. The soils were very deep (>200 cm), dark colored (10YR3/2 to 2.5Y5/2), having in-filled thin
discontinuous sandy streaks across the depth. The clay content was high (37.7 to 54.1%), and the soil water
retention at 33 kPa and 1500 kPa pressure varied from 23.5 to 47.6 and 12.7 to 25.5%, respectively. Soil
organic carbon, DTPA extractable copper, iron and zinc content were decreased with depth. The COLE
value of the soils was high (0.09 to 0.17), and cation exchange capacity (CEC) ranged from 22.9 to 36.6
cmol(p+)kg-1 soil. The rice-growing areas of old deltaic plains with changing soil moisture status with the
season and high base saturation favoured the formation of shrink-swell soils. Soils are classified into Typic
Haplusterts (Olimathi series) and Sodic Haplusterts (Naramangalam series) based on soil taxonomy.
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