4-Chlorophenoxyacetic
acid
common name:
4-Chlorophenoxyacetic acid
Other names:
4-CPA
Appearance:
White powder
mp:155-159¡æ
Specifications:
98% tech. grade
Toxicology:
Acute oral LD50 for rats 2200mg/Kg; acute dermal LD50
>2200mg/Kg. Irritating to skin and eyes. LC50 for
fish: carp 3-6ppm¡êloach (48hr) 2.5ppm,water flea>40ppm.
Application:
Auxin like plant growth regulator, absorbed by plant
via root, stem, leaf, bloom and fruit. It is used to
prevent abscission of bloom and fruit, inhibit rooting
of beans, promote fruit set, induce formation of seedless
fruit. Also used for ripening and fruit thinning. It
performs better when used in combination with 0.1% monopotassium
phosphate. It also has berbicidal effect at high dosage.
Use table:
| crop |
consistency |
Using method |
effect |
| tomato
brinjaul |
alabastrum stage 20-30ppm |
Steeping or spraying flower bud
|
bear no seed fruit under low temperature |
| after pollination 20-30ppm |
Steeping or spraying inflorescence |
Promote fruit setting |
| 15-25ppm |
Steeping or spraying flower or
flower bud |
Promote fruit setting under normal
temperature, ripe ahead of time |
| cayenne |
10-15ppm |
Spraying flower |
Increase yield |
| kidney
bean |
1-5ppm |
Spraying whole plant |
Increase yield |
| grape
orange apple lichee longan |
flowering stage 25-35ppm |
Spraying whole plant |
Prevent fruit drop, promote fruit
setting, increase yield |
| Cucumber
watermelon |
20-25ppm |
Steeping or spraying flower |
Prevent flower dropPromote fruit
setting |
|
