I would like know how can I make a thematic map (soybean production) with density points.
In this case the points are randomly plotted in a municipality area.
Please, see an example in the image:
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Use the join functionality to join the information about soybean production to the municipality geometries. Then use the random points tool in Vector | Research tools | Random points (http://www.qgis.org/en/docs/user_manual/plugins/plugins_ftools.html) to create points based on the soy bean production values. The tool will create points according to the production values. If the values are too high and would therefore cause creation of too many points, use the field calculator to calculate a new lower value first.