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Recent Findings from H. Rahardjo and Co-Researchers Yields New Information on Soil Science (Performance of an instrumented slope covered with shrubs...

August 21, 2014

Recent Findings from H. Rahardjo and Co-Researchers Yields New Information on Soil Science (Performance of an instrumented slope covered with shrubs and deep-rooted grass)

By a News Reporter-Staff News Editor at Agriculture Week -- Investigators publish new report on Soil Science. According to news reporting originating in Singapore, Singapore, by VerticalNews journalists, research stated, "Green technology, an integrated design approach that combines vegetation and engineering design methods, can be applied to improve slope stability. Orange Jasmine is a small tropical evergreen shrub which has deep root systems and is considered to be a drought-tolerant plant that adapts well to a wide range of climatic and soil conditions."

The news reporters obtained a quote from the research, "It can also grow in infertile soils, limestone soils or loam. Vetiver grass has been widely cultivated in many tropical and subtropical regions of the world for soil and water conservation, land rehabilitation, and embankment stabilization. Vetiver grass has deep roots (2-4 m) and adapts well under extreme conditions of temperature, soil, moisture, soil acidity, and alkalinity. The role of Orange Jasmine and Vetiver grass in minimizing rainwater infiltration, for improving the stability of slopes, was investigated on a soil slope in Singapore with its tropical climate. Two slope sections, covered with Orange Jasmine and Vetiver grass, were instrumented with tensiometers, installed at different depths within the slope, and a rainfall gauge. The instruments were connected to a real-time monitoring system to study the pore-water pressure, the rainfall, and the groundwater level in the slope throughout a one-year period. The pore-water pressure characteristics within the slope sections covered with Orange Jasmine and Vetiver puss are analyzed and presented in this paper. The analyses indicate that both Orange Jasmine and Vetiver grass played a significant role in reducing rainwater infiltration into the slope, minimizing the loss of matric suction, and hence, the shear strength of the soil during rainfall and, as a result, maintained the stability of the slope."

According to the news reporters, the research concluded: "Vetiver grass and Orange Jasmine appeared to be similar in effectiveness in terms of reducing the rainwater infiltration into the slope."

For more information on this research see: Performance of an instrumented slope covered with shrubs and deep-rooted grass. Soils and Foundations, 2014;54(3):417-425. Soils and Foundations can be contacted at: Japanese Geotechnical Soc, Sugayama Bldg 4F, Kanda Awaji-Cho 2-23, Chiyoda-Ku, Tokyo, 101-0063, Japan. (Elsevier -; Soils and Foundations -

Our news correspondents report that additional information may be obtained by contacting H. Rahardjo, Housing & Deve Board, Bldg & Infrastruct Department, Singapore 310480, Singapore. Additional authors for this research include A. Satyanaga, E.C. Leong, V.A. Santoso and Y.S. Ng.

Keywords for this news article include: Asia, Soil Science

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Source: Agriculture Week

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