Paclobutrazol is a triazole plant growth regulator for regulating morphological differentiation and promoting lateral bud germination and flower bud formation. Today, we will give you a detailed introduction to the characteristics and methods of use of paclobutrazol. Characteristics of paclobutrazol Paclobutrazol is a broad-spectrum plant growth retardant. It can inhibit the synthesis of endogenous gibberellins in plants and reduce the division and elongation of plant cells. After roots, stems, leaves, and absorption, it plays the role of dwarfing, promoting branching, and rooting to increase chlorophyll content, delaying leaf senescence, and enhancing stress resistance. It is mainly used in rice rapeseed soybeans and other cereal crops, and is sprayed or soaked. (1) Rice; in order to cultivate long-lasting seedlings, 180-300 mg/kg of liquid medicine can be sprayed in the 1st to 1st to 4th leaf stage of the seedlings. (2) Rape; in the 3~4 leaf stage, spray 100~200 mg/kg of liquid medicine per acre, so that the seedlings are short and strong, roots, stems and leaves are all growing well, which improves drought resistance, cold resistance and ability. (3) Soybean; in the flowering period of spring soybean and the flowering period of autumn soybean, spraying 150~200 mg/kg of liquid medicine per acre can make the plant type compact, increase the number of effective branches and pods, and increase the number of beans and Grain weight. (4) Wheat; in the 1 leaf 1 heart period, spray 130 mg/kg of liquid medicine per acre, 75 liters, so that the roots of wheat seedlings are developed, and the lodging resistance is increased. Before the jointing of spring wheat, 150 mg/kg of liquid medicine per liter of 50 liters per acre, so that the straw is thick and resistant to lodging. (5) Corn; soaking seeds with 200 mg/kg of liquid medicine for 12 hours, or spraying 150 mg/kg of liquid medicine per acre at 50 to 6 leaf stage of corn, can control plant height, fall prevention, and increase grain weight. How to use paclobutrazol First, the method of application Common methods used in flower production are soaking (planting balls), soil application, leaf spraying and drying. Among them, soaking, soil application and leaf spraying have the best effect, and the effect is long-lasting and stable. There are two kinds of soil application methods. One is to plant the leaves and plants on the ground, and to dig around the canopy about 5 cm deep, and evenly sprinkle it into the ditch and fill it in time; the second is to indoor potted plants in the potting soil. Water is poured in time after the hole is applied. The leaf spray is carried out in the early stage of growth. Different flower, soil quality and nutrient management levels have different spraying time and concentration. The spraying method is the same as the general fertilizer spraying method, but attention should be paid to make the growth point evenly. Second, the amount and concentration of application It varies according to factors such as variety, growth, age, and soil quality. The application rate of soil is generally 0.25 g per square meter, the concentration of liquid spray at the time of spraying is 800 to 1500 ppm, the concentration of soaking root (plant bulb) is 70 to 90 mg / L, and soaking for 5 to 8 hours. The amount and concentration of woody flowers can be slightly higher, and the amount of herbal flowers should be lower. Use with caution for orchids. Third, the use time of paclobutrazol Different application methods have different application times. The soil application is generally carried out before the spring flower bud sprouting (spring flower); the leaf spray is generally used when the new shoot grows about 10 to 15 cm. Deciduous flowers and trees can be used in advance for a certain period of time to ensure timely drug efficacy. Fourth, the number of application Since paclobutrazol has a long-lasting effect, it is usually applied once, and the effect lasts for 3 to 5 years, so the application frequency should be strictly controlled. The soil is applied once every 3 years, and the leaf spray is once a year. If used for years, the concentration should be reduced year by year. If the growth is extremely weak, stop using it. If necessary, spray gibberellin to help restore growth. V. Drug efficacy stagnant period Since there is a period of time from the administration of the drug to the exertion of the pharmacodynamic effect, that is, the stagnant period of the drug effect, the production is easily mistaken for "invalid", thereby repeatedly applying the drug, resulting in an excessive amount of use. This factor should be fully considered before application to avoid loss.
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