Question

What is soil? Briefly describe the four types of soil.

Answer 1

Soil is the uppermost layer of the Earth’s crust made of mineral particles, organic matter (decomposed plants and animals), water, air and living organisms. It forms by weathering of rock and biological activity and provides physical support, nutrients and water for plants.

Four basic types of soil (by texture):
- Sandy soil: largest particles (>0.05 mm). Drains and warms quickly, feels gritty, low water and nutrient retention, good for plants that need good drainage but needs frequent watering and organic amendments.
- Clay soil: finest particles (<0.002 mm). Holds water and nutrients well, feels sticky when wet and hard when dry, drains poorly and can compact, but is fertile once managed.
- Silty soil: medium particles (0.002–0.05 mm). Smooth, retains moisture and nutrients better than sand, fairly fertile but can compact and erode easily.
- Loamy soil: balanced mix of sand, silt and clay plus organic matter. Crumbly texture, good drainage and moisture retention, high fertility — generally ideal for most garden and agricultural crops.