1. If the size of the area over 25 acres, or areas not consistent, as a smaller converter then convert numbering them.2. sampling soil around 15-20 points in each of the transform submenu.3. sampling of soil using a shovel or hoe for each point a sharp axe-shaped pit excavation or wedge, with a depth of about 3 cm in the case of field crops such as rice, maize, but common use of only 10 cm in depth, because it has a shallow root system than the cornmeal, then use a trowel to gnaw a hole on one side of the soil, the soil has a thickness of 2-3 cm of soil vertical splitting into 3 equal parts soil, which will be shaped like the noodles, use only the three central (Central line). An example is the clay.
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