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Rice seedlings use paclobutrazol
Paclobutrazol is widely used in rice seedlings due to its remarkable effects such as stunting plant growth, strengthening the stalks, promoting early panicle development, enhancing disease resistance, controlling weeds, increasing yield, and ultimately boosting farmers' income. However, improper use can lead to negative consequences, including excessive dwarfing, stunted growth, or even plant death, as well as delayed maturity. To prevent these issues, the **pesticide network** recommends following five key guidelines when applying paclobutrazol.
First, the dosage should be adjusted based on the rice variety and the season. The concentration of paclobutrazol varies depending on the type of rice being grown. It’s crucial not to apply too much or too little. If the dose is too high, the seedlings may become overly dwarfed; if it's too low, the desired strengthening effect won't be achieved. For example, for early rice, 120 grams of 15% wettable powder is recommended per 667 square meters (about 1 mu), mixed with 60 kg of water. For late rice, the dosage is 200 grams per 667 square meters, mixed with 100 kg of water. For mid-season rice varieties, the dosage ranges from 150 to 180 grams per 667 square meters, with 75 to 90 kg of water, respectively. Ensure even spraying. If the concentration is too high, causing stunted growth, a 10â»â´ solution of "920" (gibberellic acid) can be applied to restore normal growth.
Second, timing is essential. The application period differs between early and late rice. In early rice, where temperatures are lower and growth is slower, paclobutrazol is mainly used to strengthen the plants and improve their resilience. This is typically done during the three-leaf stage. For late rice, the application aims to both control and promote growth, and it should be applied during the one-leaf-one-heart stage, no later than the second leaf. For medium-maturing varieties, the timing depends on local weather conditions. Early-maturing varieties are best treated at the 2-3 leaf stage, while late-maturing ones should be treated at the one-leaf-one-heart stage.
Third, it's important to spray paclobutrazol early in the transplanting process. The transplanted field tends to have fast green-up and rapid growth. The **China pesticide network** reminds farmers to manage the field with the “three early†principle: early irrigation, early promotion, and early control of seedlings. Usually, this should be done 2–3 days earlier than usual. Avoid delaying the planting (baking) of fields, as overgrown seedlings can increase pests, empty grains, reduce grain weight, and cause lodging.
Fourth, avoid delaying the application of paclobutrazol in late-maturing rice. A delayed application can push the entire growth cycle back, leading to problems with sowing schedules and late maturity. To prevent this, it's advisable to advance the sowing date by 2–3 days.
Lastly, be cautious about residue accumulation. Paclobutrazol moves slowly through the soil and is not easily broken down. Repeated use in the same field within a single growing season or over multiple years can lead to residual effects that negatively impact subsequent crops. Therefore, it's important to carefully choose the application rate and avoid using paclobutrazol multiple times in the same area within a short period. This helps ensure that future crops grow normally without unnecessary growth inhibition.