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Soil survey of the district of Tram Kak, Province of Takeo, The Kingdom of Cambodia

Bell, R.W.ORCID: 0000-0002-7756-3755, Seng, V., Schoknecht, N., Vance, W. and Hin, S.ORCID: 0000-0003-0671-623X (2007) Soil survey of the district of Tram Kak, Province of Takeo, The Kingdom of Cambodia. Cambodian Agricultural Research and Development Institute, Phnom Penh. Cambodia.

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Soil Profile Description
Soil profiles were described using a combination of codes and definitions from the Food and Agriculture Organisation and the Department of Agriculture and Food Western Australia (FAO-ISRIC 1990; Purdie 1999; FAO-CSIC 2002). These codes and descriptions were compiled into a booklet entitled ‘Dataset and Code Definitions for the Soil Survey of Cambodia’. A data sheet for recording soil profile information at each site was also produced. Soil profiles were classified using the Cambodian Agronomic Soil Classification (CASC) (White et al. 1997) and World Reference Base for Soil Resources (IUSS 2006).

Soil Chemical Analysis
Laboratory analysis was completed on all horizons for a selection of the soil profiles. These soil samples were analysed by CSBP laboratories in Western Australia. All soil samples were air-dried, ground and sieved (<2 mm particle diameter). The following tests were used (i) electrical conductivity and pH in 1:5 soil:water suspension and pH in 0.01M CaCl2 (Rayment and Higginson 1992, pp15-23); (ii) organic carbon concentrations, (Walkley and Black 1934); (iii) concentration of exchangeable cations, Gilman and Sumpter method (Rayment and Higginson 1992, pp 164-169); (iv) DPTA trace elements (copper, Cu; zinc, Zn; manganese, Mn; iron, Fe) (Rayment and Higginson 1992, pp 110-114); (v) nitrate and ammonium nitrogen (Searle 1984); (vi) available phosphorus and potassium, Colwell method (Rayment and Higginson 1992, p 64); (vii) extractable sulphur (Blair et al. 1991); (viii) boron (Rayment and Higginson 1992, pp 115-120). The soil chemical data can be found in Tables 1 to 3 at the end of this report.

Data Collection and Reporting
For each soil profile, location information was collected using a hand held GPS. This has enabled mapping of the data, and will enable users of the data in the field to return to soil profile locations. All soil profile data has been placed into an Access database currently maintained by the Soil and Water Group at CARDI. Other districts included in this study were Ou Reang Ov in the Province of Kampong Cham and Banan in the Province of Battambang. Results of these surveys can be found in soil survey reports for each district. In addition the results of these soil surveys have been used to generate soil-land unit maps of each district (Hin et al. 2005a,b,c) and assist in the assessment of land capability for field crops in each district (Bell et al. 2005a,b).

Item Type: Report
Murdoch Affiliation(s): School of Environmental Science
Series Name: CARDI Soil and Water Science Technical Note No. 12
Publisher: Cambodian Agricultural Research and Development Institute
Copyright: The Authors
Notes: ACIAR Project No. LWR1/2001/051 Assessing Land Suitability for Crop Diversification in Cambodia and Australia
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