FNGLA Horticulture Practices 2025 – 400 Free Practice Questions to Pass the Exam

Organic matter is crucial for water retention in soil because it has a unique structure that allows it to hold moisture effectively. It can absorb and retain significant amounts of water, which is important for plant growth and health. This organic material, consisting of decomposed plant and animal residues, enhances soil's overall physical properties, contributing to improved aeration, nutrient retention, and moisture holding capacity.

While clay and silt also aid in water retention, their effectiveness is often lower compared to organic matter. Clay can hold water due to its small particle size and high surface area, but it can also create drainage problems if present in excessive amounts. Silt has intermediate properties, but it lacks the nutrient and moisture-holding capabilities that organic matter provides. Sand, on the other hand, is the least effective in retaining water due to its larger particle size, which promotes quick drainage rather than retention.