What is Silt Soil? Another question we get at lawn-seeds.com. silt soil. A soil type typical to rivier areas and flood plains. Let’s take a closer look. Silt soil is composed of fine mineral particles that are smaller than sand but larger than clay. It has a smooth, silky texture and is often referred to as ‘light’ soil because of its ease of cultivation. Silt soils are fertile, offering good moisture and nutrient retention, but they can be prone to compaction and poor drainage if not managed correctly. When dry, silt soil can form a crust on the surface, making…