The layer of soil that determines how fertile the soil is is the topsoil.
The correct answer is the topsoil. This layer of soil is the uppermost layer and is responsible for supporting plant growth. It is typically darker in color and contains a higher concentration of organic matter, nutrients, and microorganisms. To determine how fertile the soil is, you can conduct a soil test. This test involves collecting soil samples from different areas of the land, analyzing them for nutrient levels, pH balance, and other factors that contribute to fertility. Soil tests can be conducted by using a soil testing kit or sending samples to a laboratory for analysis. The results of the soil test will provide information about the soil's fertility and any necessary amendments or treatments that may be required.
