Plant growth regulator 4-Chlorophenoxyacetic acid 4-CPA
4-Chlorophenoxyacetic acid 4-CPA is used as plant growth regulator, 4-CPA is absorbed by plant via root, stem, leaf, bloom and fruit. Widely used on tomato to prevent abscission of bloom and fruit.
CAS NO.: 122-88-3
Chemical name: 2-(4-Chloro-phenoxy) acetic acid;
Physical and Chemical Properties
Appearance: White powder
Molecular Formula: C8H7ClO3
Molecular Weight: 186.59
Melting Point: 157-159°C
Solubility: Sparingly soluble in water. Readily soluble in most organic solvents.
4-CPA sodium salt is soluble in water.
Stability: It is stable at elevated temperatures (54 ℃) and on exposure to metals, but degrades (30% loss in 24 hours) on exposure to sunlight.
Acute oral LD50 for rats 2200mg/kg;
Acute dermal LD50 for rats>2200mg/kg;
Irritation to skin and eyes.
LC50 for fish: carp 3-6ppm, locah (48hr) 2.5ppm, water flea>40ppm.
1. It is used to prevent abscission of bloom and fruit, inhibit rooting of beans, promote fruit set, induce formation of seedless fruit.
2.It is also used for ripening and fruit thinning.
3.It performs better when used in combination with 0.1% monopotassium phosphate.
It also has herbicidal effect at high dosage.
4.It can increase the percentage of the fruit bearing(increase output) and promote the enlargement of fruit
Tomato: When blossom for 2-3 flowers, soak flowers in 10-20ppm.
Do this three times, every 7-10 days
Pumpkin Watermelon / Cucumber, etc.(melon group):
Soak or spray the flower in 20-25ppm
Purple orange litchi Apple Longan: In florescence 25-30 ppm
Residues after Ignition
Loss on Drying
Package: 1kg/bag, 25kg/drum
Note: 4-Chlorophenoxyacetic acid 4-CPA is not soluble in water, but 4-CPA sodium salt is soluble in water. Please click here for more details