When the potted chrysanthemum uses dwarfing agent, it is also necessary to pay attention to the skill method. Below, we will learn more about the skill method with the Chinese pesticide net Xiaobian:
1. Water-soluble paclobutrazol with a paclobutrazol content of 15% is a good medicine for controlling high growth at present. Its dwarfing effect is better than that of chlormequat and longer than the long-term, and the concentration is much lower than that of chlormequat. Generally, the concentration is between 50ppm and 200ppm, and the spraying time is 7-15 days. The principle and method of spraying are the same as those of chlormequat. When the concentration is between 50ppm and 200ppm, it is safest and good. The dwarfing effect of spraying can also reduce the occurrence of chrysanthemum pests and diseases, and the use cost is also low.
Second, the common commodity is 90%, 96%, 98% powder, which can be sprayed with an aqueous solution of 2000ppm to 4000ppm. It is much safer to use than chlormequat. The starting and ending time and interval of spraying pesticides refer to the principle and method of spraying chlormequat, and the application concentration is between 1000ppm and 3000ppm. During the flower bud differentiation period, it is best to avoid spraying or changing the chlormequat. The disadvantage of using a long time is that the amount is large and the cost is high.
Third, the common commodity of chlormequat is 40% or 50% of water, which can be formulated into 500ppm to 2000ppm or 200 to 500 times solution.
Before and after the beginning of autumn, the last head was taken. When the side branch of the potted chrysanthemum was 5 to 10 cm long, the first spraying was started, and the spraying concentration was 500 ppm-2000 ppm. Initially, due to the higher temperature, the concentration can be lower. As the weather turns cooler, the concentration can be gradually increased to 2O00ppm. Because it is susceptible to phytotoxicity at high temperatures, it is best to spray after each pm at 5 pm. The spraying interval can be flexibly controlled according to the growth of the chrysanthemum. The concentration of the leaves may be longer when the concentration is high or the spraying of the dwarf chrysanthemums is lower; the concentration is lower, the spraying interval may be shorter; for the high-yield varieties that are not easy to dwarf, the spraying concentration is higher, and the interval is shorter, generally Spray once every 7 to 10 days. When spraying the chrysanthemum leaves, the front and back sides should be sprayed through, until the flower buds are exposed. Spraying during flower bud differentiation does not affect the differentiation of flower buds.
The dwarfing effects of the above three drugs are affected by the temperature and the high temperature season. Therefore, as the temperature decreases, in order to achieve the same efficacy at high temperatures, it is necessary to gradually increase the concentration of the drug.
According to the pesticide network , the use of dwarfing agents has some side effects on the growth and development of chrysanthemum, such as delayed flowering. However, in order to achieve the desired flowering and enhance the ornamental effect, it is necessary to make corresponding adjustments in water, fertilizer, management, etc.:
(1) Watering should not be watered during the proper spraying period; the potting soil should be slightly dry, and should be watered in the morning to avoid watering and fertilizing in the evening.
(2) Picking up the buds in time to keep the single buds of the single chrysanthemums, and the flowers of the multi-headed chrysanthemums are appropriately picked and budded.
(3) Strengthening fertilization After the establishment of the autumn, the spraying of the chrysanthemum buds should be carried out. Phosphorus and potassium fertilizer should be added. In addition to the normal application of the decomposed organic fertilizer, the spraying of the dwarfing agent can also add 0.1% phosphoric acid. Potassium is sprayed with potassium hydrogen and 0.2% urea solution. The pesticide manufacturer reminds everyone that when the leaves are found to be brittle and easy to fold, they should be stopped for a period of time.
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