3,4-Dimethyl-1H-pyrazole phosphate is primarily used in agriculture as a plant growth regulator. It inhibits enzymes involved in gibberellin biosynthesis, a plant hormone that promotes cell elongation, thereby controlling plant height to an appropriate level and preventing lodging in windy or heavy rain conditions. This results in stronger stems, improved plant structure, and enhanced resilience to adverse environments. It reduces excessive vegetative growth, promotes overall crop yield and quality. Additionally, it is utilized in horticulture to manage the size and shape of ornamental plants for desirable appearance, and in turf management to maintain grass density and health, especially on sports fields and golf courses.