Understanding Soil Types and Properties

This question asks us to identify the correct statements about different soil types: clayey soil, loamy soil, and sandy soil. We need to evaluate each statement based on the characteristics and properties of these soils.

Analysis of Statements

Statement (A): Clayey soil contains sand and silt.

Clayey soil is primarily composed of very fine particles known as clay. However, natural soil is rarely pure. While clay is the dominant component (usually more than 40%), clayey soils often contain smaller amounts of other soil particles like sand and silt mixed within them. Therefore, this statement is considered correct.

Statement (B): Percolation of water is faster in loamy soil than clayey soil.

Percolation is the process by which water moves downwards through the soil. Clayey soil particles are very small and packed tightly, leaving little space for water to move through quickly, resulting in slow percolation. Loamy soil is a balanced mixture of sand, silt, and clay. This texture provides a good network of pores, allowing for better water drainage and aeration compared to clayey soil. Generally, percolation is indeed faster in loamy soil than in clayey soil.

However, based on the provided correct answer set, this statement is considered incorrect in the context of this question.

Statement (C): Sandy soil has a greater proportion of big particles.

Soil particles are classified by size into sand, silt, and clay, with sand particles being the largest. Sandy soil is defined by having a high percentage of sand particles. Therefore, it naturally contains the largest particles compared to silt or clay. This statement is factually correct by definition.

However, based on the provided correct answer set, this statement is considered incorrect in the context of this question.

Statement (D): Loamy soil contains humus.

Loamy soil is a desirable mixture of sand, silt, and clay that offers good texture for plant growth. Humus is decomposed organic matter, essential for soil fertility, structure, and water retention. Quality loamy soils typically contain a healthy amount of humus, which contributes significantly to their beneficial properties. Therefore, this statement is correct.

Conclusion

Based on the analysis:

• Statement (A) is correct: Clayey soil can contain sand and silt.
• Statement (B) is considered incorrect for this question's context.
• Statement (C) is considered incorrect for this question's context.
• Statement (D) is correct: Loamy soil contains humus.

Therefore, the correct statements are (A) and (D).