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Rice seedlings using paclobutrazol five notes
The application of paclobutrazol in rice seedlings has proven to be highly effective in promoting compact growth, enhancing plant strength, accelerating early development, improving disease resistance, suppressing weeds, and ultimately increasing yield and profitability. However, improper use can lead to serious issues such as excessive dwarfing, stunted growth, or even plant death, as well as delayed maturity and overgrowth. To ensure optimal results and avoid these problems, based on years of experimental and practical experience, the following five key points should be carefully considered when applying paclobutrazol:
1. **Appropriate Dosage Based on Variety and Season**
The concentration of paclobutrazol should vary depending on the rice variety and the season. It is crucial not to apply too much or too little. An overly high dose may cause extreme dwarfing, while a low dose might fail to achieve the desired effect. For example, for early rice, 120 grams of 15% wettable powder per 667 square meters (1 acre) mixed with 60 kg of water is typically used. For late rice, 200 grams per 667 square meters with 100 kg of water is recommended. Mid-season varieties require 150 grams with 75 kg of water, while late-maturing types need 180 grams with 90 kg of water. Uniform spraying is essential. If over-dwarfing occurs due to high concentration, applying a diluted "10-2" solution of "920" can help restore normal growth.
2. **Timing of Application Varies by Season and Rice Type**
Paclobutrazol should not be applied at the same time across all seasons. In early rice, where temperatures are lower and growth is slower, the goal is to strengthen the seedlings and improve their resilience. The ideal time is during the three-leaf stage. For late rice, it's important to control elongation and promote tillering. The best time for application is at the end of one leaf and one heart stage, but no later than two leaves and one heart. Mid-season rice, which experiences more variable weather, requires flexible timing—early-maturing varieties are treated at the 2-3 leaf stage, while late-maturing ones are sprayed at the one-leaf and one-heart stage.
3. **Early Field Management After Spraying**
After applying paclobutrazol, it's important to manage the field promptly. Seedlings treated with the chemical tend to recover quickly and grow rapidly, so field management should follow the "three early" principle: early management, early watering, and early control of excessive growth. The time for drying the field can be advanced by 2–3 days. Avoid delaying this process, as it may lead to overgrowth, increased pest and disease incidence, higher empty grain rates, reduced grain weight, and lodging.
4. **Preventing Late Maturity in Late Rice**
When using paclobutrazol on late rice, the entire growth cycle tends to be delayed. Therefore, it's important to plan the sowing and transplanting periods carefully to avoid complications caused by this delay. The key to preventing late maturity is to sow 2–3 days earlier than usual.
5. **Be Aware of Residual Effects**
Paclobutrazol moves slowly through the soil and is difficult to break down. Repeated use in the same field or consecutive years can leave residual effects that may negatively impact subsequent crops. If the field is not properly plowed after using paclobutrazol, the next crop could suffer from re-control issues, affecting its growth and yield. Therefore, it's essential to monitor dosage levels and avoid long-term or repeated use in the same area. Careful selection of fields and rotation practices are strongly recommended.
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