Technical Abstract: This is a review article on nutrient-water interactions that occur in soils crop production, and environmental quality. Water is a major factor in nutrient availability to plants. Soil water content influences availabilit and movement of nutrients to plant roots, water available for plant growth, and movement of nutrients below the root zone. Nutrient availability influences the plants ability to utilize available water supplies efficien Irrigation water quality can affect the distribution and availability of fertilizer nutrients applied through irrigation systems. Water and nutrient interact to influence environmental quality, such as surface and ground wat quality. Each of these topics are briefly discussed in this encyclopedia article.