Sandy soil is typically nutrient-poor and has a poorly developed crumb structure. Large sand particles also make it easy for water to drain away quickly, making nutrients difficult to acquire by plants before they are leached out of the ground with rainwater. 

Silty soils are great for growing because they have small, irregular particles of weathered rock that make it hard to grow roots and plants in the soil. The dense texture also helps retain moisture which means less watering is needed by farmers.

Particles of clay are tiny and flat. They pack together tightly. Clay soils become difficult to dig when they are wet, making it almost impossible for plants to break through the soil easily. When dry, the topsoil cracks into flat plates rather than being porous. 

The soil is less permeable to water and that can create drought problems for farming regions compared to planting in places with sandy or loamy soils.