Which tool is commonly used to measure soil compaction in the field?

The penetrometer is a specialized instrument designed specifically to measure soil compaction in the field. It works by inserting a pointed steel rod into the soil, which applies pressure to assess resistance. The amount of resistance encountered as the rod penetrates the soil indicates the level of compaction present. Understanding soil compaction is crucial for assessing soil health, crop productivity, and water infiltration, making the penetrometer an invaluable tool in soil judging and agricultural practices.

Other tools listed, such as a soil wedge, moisture meter, and weed puller, serve different purposes. For instance, a soil wedge is more focused on assessing soil structure and texture, while a moisture meter evaluates the moisture content in the soil. A weed puller, on the other hand, is used for removing unwanted vegetation rather than for any measurement related to soil compaction. Thus, the penetrometer stands out as the most appropriate tool for measuring soil compaction.