Drought stress in spring crops can be mitigated through a comprehensive suite of measures, including scientific irrigation, moisture-conserving mulching, rational fertilization, and the application of plant growth regulators. Among these, the use of plant growth regulators stands as one of the key technical means for enhancing a crop's inherent drought resistance.

The plant growth regulators recommended for use during the growth cycle of rapeseed (canola) primarily include Paclobutrazol (Paclo), Uniconazole, Brassinolide, and DCPTA. Their core functions are to control excessive vegetative growth, prevent lodging, promote branching, enhance stress resistance, and significantly boost yield.

Prohexadione calcium is a plant growth regulator whose main components are oxadiazole and calcium ions. Oxadiazole promotes corn seedling growth, increases photosynthesis efficiency, inhibits harmful substances produced by photosynthesis, and improves light energy utilization. Calcium ions promote plant cell division and elongation, enhancing plant stress resistance and immunity.

In recent years, with the widespread adoption of cotton cultivation, various plant growth regulators have played an increasingly important role in promoting cotton growth. To help cotton farmers and technicians better understand these regulators