International Journal of Civil and Structural Engineering

Volume 4 Issue 3 2014          Pages: 450- 468       << Previous      Next>>

Effect of SOC in the form of amendments on hydraulic properties of arid soils

Author Information:

Guruprasad M. Hugar1 Veena .S. Soraganvi2
1-Dept. of Civil Engineering, Government Engineering College, Raichur-584134, Karnataka, India.

2-Dept. of Civil Engineering, Basaveshwar Engineering College, Bagalkot-587102, Karnataka, India

ABSTRACT

Raichur district is located in the northern region of Karnataka; it is drought prone and falls in the arid tract of India. The climate here is dry for the major part of the year. The low and highly variable rainfall renders the district liable to drought. Increasing the soil water‐holding capacity (WHC) has been a major concern in this area.  Increasing soil organic carbon (SOC) is vital in terms of improving the soil properties related to conditions for crop development and tillage traffic in arid and semiarid regions. This study is conducted to characterize the threshold limit of SOC with respect to WHC and hydraulic conductivity (K) in four of the arid soils namely black cotton, red, marshy and mountainous soils. Wastes like humus, pressmud, bagasseash and flyash were used as a source of SOC to amend with the soils. SOC inputs were made volumetrically up to 70% in the increments of 10% of the soil columns; there was also a control column without any external addition of SOC. The relation between SOC, WHC and K was analyzed by series of experiments carried in triplicate in three different phases based on the mode of application of SOC. The highest WHC’s achieved were 92.8%, 78.9%, 88.3 and 76.3% similarly highest K were 6.5E-06 cm/s, 2.5E-05cm/s, 1.8E-05 cm/s and 2.6E-05cm/s for black cotton, red, marshy and mountainous soils respectively. Phase III performed better for all the soils with respect to WHC and K. The positive relation between threshold limits of SOC, WHC and K was obtained.

Keywords: WHC, K, SOC, Threshold limit and mode of application

doi: 10.6088/ijcser.201304010043

Copyright: © 2014 by the author(s), licensee Integrated Publishing Association. This is an open-access article distributed under the terms of the Creative Commons Attribution License (3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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