DATA INTRODUCTION: Soil solidity refers to the soil resistance equivalent to vertical pressure when the plunger (or cone) is inserted into the soil, also known as penetration resistance. The degree of soil compaction can affect the perforation and growth of crop roots and is an important indicator of soil physical properties for evaluating soil cultivability. The firmness of the soil is measured by a solid gauge method. When the probe of the solidity meter is pressed into the soil, the spring proportional to the resistance to the probe is also correspondingly compressed, and the probe is accordingly pressed into the solidity meter. The pressure required to press in the probe is proportional to the hardness of the soil.
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