Detailed Explanation of the Correct Use Methods and Precautions of Paclobutrazol
Paclobutrazol is a growth regulator often used by many farmers in planting and production. For plants, it is mainly used to regulate morphological differentiation, promote lateral bud germination and flower bud formation, etc. Because of its remarkable efficacy, it is favored by many growers. So how should paclobutrazol be used? What precautions are there? Below, the editor brings you the use methods and precautions of paclobutrazol. Let's take a look!
I. Use Methods
1. Application Method
Paclobutrazol is a broad-spectrum growth retardant, very beneficial to the growth of most plants. However, its effect is more obvious mainly on cereal crops such as rice, rapeseed and soybean. When applying it to rice, generally one month before rice heading, about 200 grams of paclobutrazol per mu is diluted with water, mainly by spraying. For rapeseed, the solution should be sprayed directly when there are 3-4 leaves, which can effectively enhance the plant's cold and drought resistance. In addition, it can also be used in flower production, with the main application methods including soaking, soil application and foliar spraying.
2. Application Time
The application time of paclobutrazol mainly depends on the method of application. If it is soil application, it should be carried out in spring before the flower buds sprout, while if it is foliar spraying, it should be carried out when the new shoots of the year are about 10-15 cm. Then also pay attention to controlling the application amount according to factors such as variety, growth vigor and tree age. Usually the soil application amount is kept at 0.25 g/sq m, while for foliar spraying, attention should be paid to controlling the concentration well.
3. Application Frequency
The persistence of paclobutrazol is very long. Usually after each application of paclobutrazol, its efficacy can last for about 3-5 years. Therefore, we must strictly control the number of applications. If it is soil application, it should be applied at least once every three years. If the application frequency is too high, it will cause phytotoxicity to plants. If it is foliar spraying, it needs to be done once a year. However, if it is applied continuously every year, the concentration of the solution needs to be reduced each year. At the same time, if the plants are found to be very weak in growth, it should be stopped in time, and if necessary, an appropriate amount of gibberellin can be sprayed to promote recovery of growth.
II. Precautions
When applying paclobutrazol, note that it should be sprayed on a rainless sunny evening. Also pay attention to controlling the dosage well, matching it with sufficient water, and applying it evenly to avoid missing or repeated spraying. For some plants sown too late or growing poorly, paclobutrazol should not be applied excessively. In addition, as just mentioned, special attention should be paid to controlling the amount of paclobutrazol and not spraying too much, to prevent phytotoxicity and instead affect plant growth.
The above is a brief introduction to the use methods and precautions of paclobutrazol. That's all for today's introduction. This article is for reference only, and I hope it can help everyone!