Sample collection is an important part of soil testing. If it is not representative, it will affect the authenticity of soil nutrients. In the sampling should pay attention to the following points: First, there must be enough sampling points, with special tools for earth-sucking, generally each sampling point should have 15-20 sampling points. The fewer sample points, the worse the representation. The second is that sampling points should be evenly distributed. The more concentrated the sampling points are, the smaller the representativeness of sampling points is. Third, do not take the soil in the fields, trenches, forest belts, and dunghills. Fourth, the depth of sampling must be consistent, do not suddenly deep and shallow. Fifth, the proportion of the upper and lower levels of sampling should be the same.
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