Desert soil is characterized by its unique composition and properties due to the arid climate and limited vegetation cover. The lower horizon of desert soil is the subsoil layer, which lies beneath the topsoil layer. It is important to note that desert soil is generally not very fertile or rich in nutrients compared to soils in other regions.



The lower horizon of desert soil primarily contains deposits of calcium. This means that calcium is one of the main nutrients present in this layer, although it may not be as abundant as in more fertile soils.

1. Calcium
Calcium is an essential nutrient for plant growth and development. It plays a crucial role in maintaining the structure and stability of the soil. Calcium helps to improve the soil's ability to hold water and nutrients, which is particularly important in arid environments where water is scarce. Additionally, calcium is involved in regulating various physiological processes in plants, such as cell division and nutrient uptake.

2. Other Nutrients
While calcium is the primary deposit in the lower horizon of desert soil, it does not mean that other nutrients are entirely absent. Iron, potash, and phosphorus may also be present in smaller quantities. However, the concentration of these nutrients is generally lower compared to calcium.

3. Importance of Nutrients in Desert Soils
The presence of nutrients, including calcium, in the lower horizon of desert soil is crucial for the growth of plants and the overall ecosystem. In arid environments, where water and nutrients are limited, plants must adapt to survive. The availability of essential nutrients in the soil can greatly affect the ability of plants to establish and thrive in such harsh conditions.

Conclusion
In summary, the lower horizon of desert soil contains deposits of calcium, which is a vital nutrient for plant growth. While other nutrients like iron, potash, and phosphorus may also be present, calcium is the primary deposit in desert soils. Understanding the composition of desert soil is important for agricultural practices and land management in arid regions, as it helps determine the fertility and potential for plant growth.