Plant growth regulators are a category of **pesticides** used to control and enhance plant growth and development. These substances can be either synthetic compounds or naturally derived plant hormones. To achieve optimal results, it is essential to understand both their proper usage and important precautions. Here’s a detailed guide on how to use them effectively:
First, the key points to consider when using plant growth regulators:
1. **Use the correct dosage** – Overuse can be harmful. Growth regulators function similarly to natural plant hormones and should not be applied in excess. Typically, only a few grams or milliliters per acre are needed. Some farmers tend to increase the concentration out of fear that it might not work. However, excessive application can lead to negative effects such as leaf distortion, wilting, and even plant death.
2. **Avoid mixing without caution** – Many farmers mix these regulators with fertilizers, pesticides, or fungicides to save time. However, not all combinations are safe. It is crucial to check compatibility before mixing. For example, ethephon is acidic and should not be mixed with alkaline substances, while amine ester is sensitive to alkali and should not be combined with alkaline products.
3. **Follow the correct application method** – Some growers apply the regulator directly without reading instructions. Not all regulators dissolve easily in water, so they may need to be prepared as a stock solution first. Failure to do so can reduce effectiveness. Always dilute according to the manufacturer’s guidelines.
4. **Do not replace fertilizers** – Growth regulators are not a substitute for nutrients. They regulate growth, but cannot provide the essential elements plants need. If soil lacks water or nutrients, applying too much regulator can be detrimental. Ensure proper fertilization and irrigation first, then use the regulator to support growth.
Second, additional notes on using plant growth regulators:
1. **Improve fertilizer and water management**
- Apply balanced fertilizers, combining organic and chemical sources. Focus on nitrogen, phosphorus, potassium, and micronutrients. Avoid over-fertilizing during fruiting stages.
- Water properly, especially during fruit development. Water early in the morning or late in the evening to avoid evaporation and stress.
2. **Enhance tree management**
- Thin flowers and fruits based on tree capacity to prevent overloading. Remove deformed or overcrowded fruits.
- Control summer shoots by limiting water or pruning to encourage fruiting.
- Prune regularly to improve light penetration and air circulation, removing weak, dead, or diseased branches.
3. **Strengthen pest and disease control**
- Act at the right time to prevent infestations. Use low-toxicity, high-efficiency pesticides.
- Follow label instructions for preparation and application. Avoid spraying during flowering or under extreme weather conditions.
**Tip from the China Pesticide Network**: Using growth regulators correctly and following regulations not only saves costs but also ensures better results. Always read instructions carefully and apply them thoughtfully for the best outcomes.
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