some agricultural products necessitate the use of plant growth regulators

For example, in regions north of the Yangtze River in my country, greenhouse tomato production during winter and spring often suffers from temperatures below 15°C or above 35°C, preventing normal fruit setting. Anti-drop agents and other growth regulators are needed to protect flowers and fruits; otherwise, it would be difficult to guarantee the tomato supply in these regions during the winter and spring.

For example, the ideal banana-growing areas are in the southeastern coastal regions and southern parts of the southwest. Fully ripe bananas only have a storage life of 2-3 days, while it generally takes a week for bananas from Hainan to Beijing. Therefore, it's necessary to adopt the internationally accepted practice of harvesting and selling bananas when they are 70-80% ripe, and using ethephon to ripen them during transportation or before they are sold to consumers (urban and rural residents). Otherwise, consumers in northern my country wouldn't be able to enjoy affordable and high-quality bananas.

For example, in cotton production, chlormequat chloride is used in the early stages to control plant height and increase yield, while thiazuron is used in the later stages to promote defoliation and boll opening, improving cotton quality and facilitating mechanized harvesting. Furthermore, gibberellic acid is widely used in hybrid rice seed production; otherwise, seed yield would be difficult to guarantee.