| 21. | They conduct research in irrigation and drainage, tillage, soil classification, soil fertility, and other areas.
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| 22. | Canadian soil scientists required a new method of soil classification that focused on pedogenic processes in cool climatic environments.
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| 23. | At the top, most general, level of the Australian Soil Classification, there are fourteen soil orders.
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| 24. | The World Reference Base for Soil Resources ( WRB ) aims to establish an international reference base for soil classification.
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| 25. | The most common engineering classification system for soils in North America is the Unified Soil Classification System ( USCS ).
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| 26. | Under the Australian Soil Classification they can be included in different orders such as Podosols, Sodosol, Chromosols or Kurosols.
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| 27. | The process for grading a soil is in accordance with either the Unified Soil Classification System or the AASHTO Soil Classification System.
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| 28. | The process for grading a soil is in accordance with either the Unified Soil Classification System or the AASHTO Soil Classification System.
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| 29. | The process of grading a soil is in accordance with either the Unified Soil Classification System or the AASHTO Soil Classification System.
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| 30. | The process of grading a soil is in accordance with either the Unified Soil Classification System or the AASHTO Soil Classification System.
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