3.2 the Operation Research
in the study will be collected from the survey and the results of analysis in the field, there is an example of laboratory experiments are as follows: How to collect soil samples 1 3.2
soil sample collection, covering an area of study, select the point store examples of overlapping between the map shows the land to take advantage of the map shows the land- November, 2554 by storing the sample depth 100 cm to use as a representative of the soil on land and below as in Figure 3.1 - 3.8
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