What type of material is often included in soil property analysis?

Soil property analysis typically includes a variety of materials that collectively contribute to the soil's characteristics and health. Organic matter plays a critical role in enriching soil, improving its structure, moisture retention, and nutrient availability for plants. Sand is another essential component; it influences soil drainage, aeration, and the ease with which roots can penetrate the soil. Similarly, clay is included because it can hold nutrients and water but may affect drainage due to its compactness.

Including all these elements provides a comprehensive understanding of the soil's physical and chemical properties. By analyzing organic matter, sand, and clay, one is able to assess the soil's fertility, texture, drainage capabilities, and overall sustainability for agricultural or ecological purposes. Hence, the answer encompasses all the significant components typically analyzed in soil studies.