Controlled-release refers to a method of delivering medication or nutrients in a way that allows them to be released slowly over time. This approach helps maintain consistent levels of the substance in the body, improving effectiveness and reducing side effects. It is commonly used in pharmaceuticals, where patients benefit from fewer doses throughout the day. This technique can also be applied in agriculture, where controlled-release fertilizers provide nutrients to plants gradually. This ensures that crops receive the necessary elements for growth without the risk of over-fertilization, promoting healthier plants and reducing environmental impact.