Soil rich is a term used to describe soil that is high in organic matter and nutrients. The two crossword solutions for this term are LOAM (4 letters) and LOAMY (5 letters). LOAM is a type of soil composed of clay, sand, silt, and organic matter. It is known for its ability to retain water and nutrients, making it ideal for growing plants. Loamy soil is similar to LOAM but has a higher proportion of sand and silt. It is also known for its ability to hold onto water and nutrients, making it an excellent choice for gardening and farming.