The crossword solution for the term 'RICHER, AS SOIL' is PEATIER, with 7 letters. Peat is a type of soil that is formed from partially decomposed organic matter, such as mosses and other plants. It is found in wetland areas and is often used as a soil amendment to increase the fertility of the soil. Peatier soils are richer in organic matter than other types of soil, making them more fertile and better able to retain moisture.