In rice production, the scientific application of brassinolide can effectively improve the seed setting rate and increase the thousand-grain weight, making it an important technical means to achieve high and stable yields. Its core mechanism of action lies in regulating endogenous plant hormones, promoting the translocation of nutrients to the grains, and enhancing the plant's resistance to adverse conditions.
Key Periods for Rice-Specific Brassinolide to Improve Seed Setting Rate and Thousand-Grain Weight
To maximize its yield-increasing effect, it needs to be sprayed during the key growth stages of rice, focusing on the booting, heading and flowering, and grain-filling stages:
Boiling and Heading/Flowering Stages:
This stage is crucial in determining the number of grains per panicle and the seed setting rate. Brassinolide significantly improves pollen viability, promotes pollen tube elongation, and improves the fertilization process, thereby effectively increasing the seed setting rate and reducing empty grains. Spraying at this time also results in more uniform heading.
Grain-Filling Stage:
This stage is the core period for determining the thousand-grain weight. Brassinolide can enhance leaf photosynthesis, delay the premature aging of functional leaves, and promote the efficient and rapid transport of photosynthetic products (carbohydrates) to the grains, making the grains fuller and significantly increasing the thousand-grain weight.
