China Supplier Pgr Plant Growth Regulator 4 Chlorophenoxyacetic Acid Sodium 4CPA 98%Tc

Scope of application

P-chlorophenoxyacetic acid is a growth regulator of phenoxyl plants with auxin activity. It is mainly used to prevent falling flowers and fruit, inhibit legumes from rooting, promote fruit setting, induce drupe-free fruit, and promote ripening growth.

Usage method

Accurately weigh 1 gram of sodium chloropenoxate, put it into a beaker (or small glass), add a small amount of hot water or 95% alcohol, stir it continuously with a glass rod until it is completely dissolved, and then add water to 500 ml, that is, to become 2000 ml/kg of anti-fall stock solution. When used, it is advisable to dilute a certain amount of stock solution with water to the required concentration for spraying, dipping, etc.
(1) Prevent falling flowers and fruits:
① Before and after 9 a.m., dip open zucchini female flowers with 30 to 40 mg/kg of liquid medicine.
②Put 30 to 50 mg/kg of liquid medicine in a small bowl, and dip the flowers in the morning of the eggplant flowering day (dip the flowers in the liquid medicine, and then touch the petals on the side of the bowl to let the excess drops flow into the bowl).
③ With 1 to 5 mg/kg of liquid medicine, spray the flowering inflorescence of beans, spray once every 10 days, spray twice.
④ In the autumn cowpea flowering period, with 4 to 5 mg/kg of liquid medicine, spray flowers, spray once every 4 to 5 days.
⑤When 2/3 of the flowers are open on each inflorescence of the tomato, spray the flowers with 20 to 30 mg/kg of liquid medicine.

⑥ In the flowering period of grapes, spray with 25 to 30 mg/kg of liquid medicine.
⑦When cucumber female flowers open, spray flowers with 25 ~ 40 mg/kg of liquid medicine.
⑧ 3 days after the sweet (hot) pepper blossoms, spray flowers with 30 to 50 mg/kg of liquid medicine.
⑨ In the flowering period of female white gourd, spray the flowers with 60 ~ 80 mg/kg of liquid medicine.
(2) Enhance storability: 3 to 10 days before the harvest of Chinese cabbage, choose a sunny afternoon, with 40 to 100 mg/kg of liquid medicine, spray from the bottom up from the base of Chinese cabbage, with the leaves wet and the liquid medicine is not dripping, can reduce the storage period of Chinese cabbage leaf.

Matters needing attention

(1) Stop using vegetables 3 days before harvest. It is safer to use than 2, 4-drops. Use a small sprayer (such as a medical throat sprayer) to spray flowers and avoid spraying on shoots and shoots. Strictly control the dosage, concentration and duration of the drug to prevent drug damage.
(2) Avoid applying medicine on hot, hot and rainy days to prevent drug damage. Do not use this agent on reserved vegetables.

Storage condition

Storage conditions 0-6°C; Seal and dry store. Warehouse ventilation and low temperature drying; Store and transport separately from food raw materials.

Preparation method

It is obtained by condensation of phenol and chloroacetic acid and chlorination. 1. Condensation the melted phenol is mixed with 15% sodium hydroxide solution, and the chloroacetic acid aqueous solution is neutralized with sodium carbonate. The two are mixed in the reaction pot and heated for reflux for 4h. After the reaction, add hydrochloric acid to the pH of 2-3, stir and cool, crystallize, filter, wash in ice water, dry, phenoxyacetic acid is obtained. 2. Chlorination Mix phenoxyacetic acid and glacial acetic acid to dissolve, add iodine tablets, and remove chlorine at 26-34℃. After the end of chlorine, put overnight, the next day in cold water crystallization, filter, wash with water until neutral, dry finished products.