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15 cm 60 cm Sandy Acid Soils of Cambodia:  their origin, properties and management for upland crops Grantee Student:  Sari...
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Sandy Acid Soils of Cambodia: their origin, properties and management for upland crops

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Transcript of "Sandy Acid Soils of Cambodia: their origin, properties and management for upland crops"

  1. 1. 15 cm 60 cm Sandy Acid Soils of Cambodia: their origin, properties and management for upland crops Grantee Student: Sarith Hin , School of Environmental Science, Murdoch University, Western Australia Supervisor: Prof. Richard W. Bell Co-supervisor: Ass. Prof. David Newsome March 2010 3. Identifying similarities and differences in physical and chemical properties of sandy acid soils from different parts of Cambodia Sandy soils will be classified using ordination and regression tree analysis into groups based on similarity of their physical and chemical properties and morphological characteristics. The main types of acid sandy soils will be selected for more detailed glasshouse and field experiments. 12 cm 85 cm <ul><li>Coastal zone in Kampot Province. </li></ul><ul><li>Tramkak district of Takeo Province: </li></ul><ul><li>Southern end of the Tonle Sap Lake in Kampong Chhnang Province. </li></ul><ul><li>Eastern Cambodia in Ponhea Krek District of Kampong Cham Province. </li></ul>4. Identifying the effects of physical and chemical properties of acid sandy soil on the growth and yield performance of upland crops Pot and field experiments will be conducted on different types of sandy soils. The experiments will aim to identify main constraints to crop production on different types of sandy soils and to assess crop responses to amelioration treatments such as organic and inorganic fertilisers, supplementary irrigation, and lime. III. Methodology <ul><li>Conducting soil profile description at each site by using FAO guidelines (FAO, 1990). </li></ul><ul><li>Analysing soil physical and chemical characteristics which can be used as indicators for the origins of soil parent materials and soil forming processes. </li></ul>2. Identifying the origin and the processes of sandy soil formation in Cambodia 1. Study areas IV. Conclusions Key differences among sandy soils in origin of the parent materials and edaphic properties will be determined. Edaphic constraints for production of crops such as cassava on key types of sandy soils will be identified. A more detailed understanding of the properties and distribution in Cambodia of the sandy soils will support the diversification of market-led crop production in Cambodia, especially in the upland sandy acid soils. Map indicating the location of the research areas within Cambodia Soil profile of the Southern end of the Tonle Sap Lake in Kampong Chhnang Province. Acknowledgements: This research is being carried out with financial support from Ginés–Mera Memorial Fellowship Fund through the International Center for Tropical Agriculture (CIAT) and John Allwright Fellowship through the Australian Centre for International Agricultural Research (ACIAR). The Cambodian Agricultural Research and Development Institute (CARDI) and Murdoch University are providing office, laboratory and glasshouse facilities. <ul><li>II. Objective </li></ul><ul><li>The research aim to: </li></ul><ul><ul><li>identify the origin and the processes of sandy soil formation in different parts of Cambodia. </li></ul></ul><ul><ul><li>explore similarities and differences in physical and chemical properties of sandy acid soils from different parts of Cambodia. </li></ul></ul><ul><ul><li>identify the effects of physical and chemical properties of sandy acid soils on the growth and yield performance of upland crops. </li></ul></ul><ul><li>I. Background </li></ul><ul><li>Vast areas of sandy upland soils occur in Cambodia, however, detailed information about their distribution is very poor. Neither has there been in-depth analysis of the factors affecting formation of sandy soils in Cambodia. </li></ul><ul><li>There is inadequate knowledge of the causes of differences in key properties of sandy soils such as acidity, or factors affecting the distribution of different classes of sandy acid soils. </li></ul><ul><li>The present study will for the first time in Cambodia determine similarities and differences among sandy soils in different parts of Cambodia to explore the implications for improving market-led crop productivity on these soils. </li></ul>

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