What is a common method for assessing soil compaction?

A penetrometer test is a widely recognized method for assessing soil compaction. This test involves using a penetrometer, a device that measures the resistance of the soil to penetration. The results can provide valuable information about the density and compaction of the soil layer, which is crucial for understanding how well roots can penetrate and access water and nutrients. Compacted soils can impede root growth, reduce aeration, and negatively affect crop productivity.

The other methods listed, while useful in various contexts, do not directly measure the physical compaction of soil. Measuring moisture levels assesses the water content in the soil but does not necessarily indicate its compaction status. Evaluating crop yield provides insights into the overall health of crops but is influenced by numerous factors beyond soil compaction alone. Taking a soil sample for nutrient analysis is essential for understanding the chemical properties of soil but does not address the physical aspects of compaction. Therefore, the penetrometer test stands out as the most effective method for assessing soil compaction directly.