Journal of Food, Agriculture and Environment

Low permeability of subsurface soil restricts the leaching of soluble salts of hard saline-sodic soils in the Songnen plain in Northeast China

Author(s):

Chunming Chi ¹, Zhichun Wang ²*

Recieved Date: 2013-07-14, Accepted Date: 2013-10-18

Abstract:

In this study, a hard saline-sodic soil was selected and two experiments were done. In Experiment I, phosphogypsum (PG) was mixed with 3 cm depth soil to study whether PG can significantly prevent seal formation and promote Na–Ca exchange. In Experiment II, PG was only applied to the surface soil of 15.00 cm depth in a 30 cm depth soil column to study whether low permeability of subsurface soil restricts the leaching of soluble salts. In experiment I, finial infiltration rate (FIR) increased from 0.00 mm h^–1 for control soil to 0.71, 1.39 and 1.76 mm h^–1 for soils treated with 25, 50 and 100% GR, respectively. The cumulative removal Na⁺ was found in the order 100%GR > 50%GR > 25% GR > control. In Experiment II, there were no leachates for the control treatment throughout the experimental period and the effluent for 25, 50 and 100% GR treatment decreased to 0.00 ml after 9 day, 13 day and 23 day from the start of the leaching process, respectively. The EC_e declined from 27.25 dS m^-1 of control soil to 26.60, 24.48 and 23.01 dS m^-1 at 10 cm depth of soil treated with 25, 50 and 100% GR, respectively. Therefore, PG only applied to the surface soil was ineffective in reclaiming saline-sodic soil in this study because leaching of soluble salts is restricted by the low permeability of subsurface soil.

Keywords:

Electrical conductivity (EC), sodium adsorption ration (SAR), phosphogypsum (PG), infiltration rate (IR), salt leaching

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 1503-1506

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