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Rice seedlings use paclobutrazol
Paclobutrazol is widely used in rice seedling cultivation due to its significant benefits, such as stunting plant height, strengthening stems, promoting early panicle development, enhancing disease resistance, preventing weeds, increasing yield, and ultimately boosting farmers' income. However, improper application can lead to negative consequences, including excessive dwarfing, growth stagnation, or even plant death, as well as delayed maturity. To avoid these issues, the **pesticide network** recommends that farmers follow five key guidelines when using paclobutrazol:
1. **Adjust dosage based on variety and season**: The concentration of paclobutrazol should be tailored to the specific rice variety and seasonal conditions. Overuse may cause excessive dwarfing, while underuse may not produce the desired effects. For example, for early rice, 120 grams of 15% wettable powder is typically mixed with 60 kg of water per mu (667 square meters). For late rice, the dosage increases to 200 grams per mu, mixed with 100 kg of water. For mid-season rice varieties, it's 150 grams per mu with 75 kg of water, and for late-maturing varieties, 180 grams with 90 kg of water. It’s important to spray evenly, and if the concentration is too high and causes growth stagnation, a 10^-4 dilution of "920" (gibberellic acid) can be used to promote recovery.
2. **Apply at the right time according to the growing stage**: The timing of paclobutrazol application varies depending on the type of rice. In early rice, which grows slowly due to low temperatures, the application is usually done during the three-leaf stage to strengthen the seedlings and improve their resilience. For late rice, application occurs during the one-leaf-and-one-heart stage, no later than the second leaf. Mid-season rice varieties should be treated during the 2-3 leaf stage, while late-maturing types are best treated during the one-leaf-and-one-heart stage, depending on local climate conditions.
3. **Ensure timely field management after application**: After applying paclobutrazol, the transplanted fields tend to have fast growth and early greening. The **China pesticide network** advises farmers to implement the "three early" strategy: early irrigation, early promotion, and early control of seedlings. Typically, this should be done 2-3 days earlier than usual. Delaying transplanting or allowing excessive seedling growth can increase pests, empty grains, reduce grain weight, and lead to lodging.
4. **Avoid delaying the application for late-maturing rice**: Late-maturing rice has a tendency to delay its growth cycle, so it's crucial to adjust sowing dates accordingly. Farmers should aim to sow 2-3 days earlier to prevent delays in maturity. Proper planning of planting schedules is essential to ensure optimal growth and harvest times.
5. **Monitor pesticide residues**: Paclobutrazol moves slowly through the soil and is not easily degraded. Repeated use in the same plot over multiple years can lead to residue buildup, potentially affecting subsequent crops. This may result in continued growth inhibition in post-crop plants. Therefore, it's important to carefully manage application rates and avoid repeated use in the same area within a single season. Choosing suitable fields and following proper application techniques can help minimize long-term risks.
By following these guidelines, farmers can maximize the benefits of paclobutrazol while minimizing the risks associated with improper use.