The term 'ADD NUTRIENTS TO' can be completed with the crossword solutions ENRICH, LEACHER, MINERALS, and FERTILIZE. Enriching soil is a process of adding organic matter to the soil, which helps to improve its structure and fertility. Leaching is the process of removing soluble components from soil, such as MINERALS, by washing them away with water. Adding MINERALS to soil is a way to increase its nutrient content, which can help plants to grow better. Fertilizing is the process of adding nutrients to soil in order to promote plant growth. All of these processes are ways to add nutrients to soil in order to improve its fertility and support healthy plant growth.