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In-situ Studies of Water Transmission Properties of a Sandy Loam Soil of Old Himalayan Piedmont Plain

M.I. Khalil
Soil Science Division Bangladesh Institute of Nuclear Agriculture P.O. Box-4, Mymensingh-2200

M. Bodruzzaman
Scientific Officer (Soils), Wheat Research Centre, BARI, Dinajpur.

S.M. Rahman
Soil Science Division Bangladesh Institute of Nuclear Agriculture P.O. Box-4, Mymensingh-2200

M.E. Haque
Soil Science Division Bangladesh Institute of Nuclear Agriculture P.O. Box-4, Mymensingh-2200

Abstract/ Executive Summary:

Water transmission properties of a sandy loam soil of old Himalayan Piedmont Plain were determined in situ to develop appropriate soil and water management practices for sustained crop production. Results indicated that field capacity attained within 36 hours and soil water content dropped off rapidly immediately alter saturation. Water retention capacity was comparatively higher in 15-90 cm soil profile in comparison to 0-15 and 90-120 cm depths. There were no considerable variations in total available water content due to different pressure potentials. Infiltration studies indicated faster entry of water initially which decreased considerably at a slower rate with time. The amount of soil water storage was higher in 15-90 em soil profile and decreased considerably after 25 days of drainage. The downward flux of water increased with depth and decreased with time. The functional dcpcn.jcncc of the hydraulic conductivity is an exponential one and showed a straight line relationship. The hydraulic conductivity increased with soil depth and decreased with the decrease of soil water content.' An increased amount of water is required for the same hydraulic conductivity for the sub-surface layers.

Keywords: In-situ,Water,Properties, Loam soil, Himalayanpiedmont plan

Location: Wheat Research Centre, Dinajpur

Start Date: 00-00-1994

End Date: 00-00-1995

Program Area: Crop-Soil-Water Management

Commodity: Land erosion

Objectives:

To generate information on the water transmission properties of the soils in order to develop appropriate soil and water management practices for economic and higher crop production.

Methodology:

Studies were carried out during 1994-95 in the experimental farm of wheat Research Centre, Dinajpur representing Birgonj series under Agro-ecological zones of Old Himalayan Piedmont Plain. The general soil type is Non- Calcareous Brown Floodplain soil although the soil colour is grey in surface layers. The important physical properties of the study area were determined following standard laboratory and field methods (Karim et. aI., 1988) by collecting representative soil samples up to a depth of 120 em. Penetration resistance (PR) was measured by opening a pit in three locations using a pocket penetro meter (range = 0-4.5 kg cm^'2up to 120 em soil depth at an interval of 5 cm and the value were averaged for every 15 cm Some physical properties of soils of the study area are presented.

Source of Information: Bangladesh J. Nuclear Agric. 12 : 11-23, 1996

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results indicated that field capacity attained within 36 hours and soil water content dropped off rapidly immediately alter saturation. Water retention capacity was comparatively higher in 15-90 cm soil profile in comparison to 0-15 and 90-120 cm depths. There were no considerable variations in total available water content due to different pressure potentials. Infiltration studies indicated faster entry of water initially which decreased considerably at a slower rate with time. The amount of soil water storage was higher in 15-90 em soil profile and decreased considerably after 25 days of drainage. The downward flux of water increased with depth and decreased with time. The functional dcpcn.jcncc of the hydraulic conductivity is an exponential one and showed a straight line relationship. The hydraulic conductivity increased with soil depth and decreased with the decrease of soil water content.' An increased amount of water is required for the same hydraulic conductivity for the sub-surface layers.

Knowledge Management: Journal