ធនធាន ដាក់ស្លាក: Soil Testing
9 items found (Showing 1 - 9)
- 31 មករា 2013 This is a laboratory protocol that outlines methodsof extracting, and analyzingNO3- from soil.
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ធនធានសំខាន់
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- ไทย (th)
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- 20 មករា 2014 A good book full of information about testing the quality of a soil by studying the plants associated with it.