【1】Chinese common name pendimethalin

【2】English common name pendimethalin

【3】Commodity name Chuicaotong, Pendimethalin, Shitianbu, Pendimethalin

【4】Chemical name N-(1-ethylpropyl)-2,6-dinitro-3,4-dimethylaniline

【5】CAS No. 40487-42-1

【6】Molecular formula C13H19N3O4

【7】Relative molecular mass 281.31

【8】Physical and chemical properties

The original drug is an orange-yellow crystalline solid with a melting point of 54-56°C, vapor pressure (25°C) <4.0mPa; solubility in water 0.3mg/L (20°C), acetone 700, xylene 628, corn oil 148, heptane 138 , isopropanol 77 (g/L, 26 ℃). It is stable in storage at 5 ~ 130 ℃, DT50 value in water is less than 21d, stable to acid and alkali, DT50 value in soil is 30 ~ 90d, and it decomposes slowly under light.

【9】Toxicity Low toxicity

【10】Main dosage forms 90%, 95% pendimethalin original drug, 330g/L pendimethalin EC, 450g/L pendimethalin microcapsule suspension

【11】Features

Pendimethalin, as a selective pre-emergence and post-emergence herbicide for dry field soil treatment, acts by binding to tubulin after the buds, stems and roots absorb the drug during the germination of weed seeds. In tobacco, banana and sweet potato, it can inhibit the division and elongation of meristematic cells, thereby achieving the effect of controlling growth.

【12】Applied technology

Tobacco

When 1/2 central flower of the whole field is open and the parietal leaves are more than 20cm, topping is carried out, and all axillary buds longer than 2cm are removed. For spraying, the amount of liquid medicine per plant is 20mL. It can inhibit the growth of axillary buds, promote tobacco quality and increase yield.

Banana

Injection of 1.5%～2.0% pendimethalin EC into the sucking buds of bananas can effectively promote the decay and death of sucking buds, solve the problem of inexhaustible bud removal in banana production, and promote the plant height and Stem thick growth, and has no adverse effect on the growth of the bulb and root system of the banana mother plant.

Sweet potato

It is used twice on the medium and long vine varieties. When the sweet potato stems and potatoes grow to a length of 50-60 cm (40-50 days after transplanting), the first spray of 1650 mg/L liquid (the amount of liquid is 25-50 d) is used. 35kg/mu), during the stem and vine sealing ridge period (70-80d after transplanting), the second application of the same concentration (45-60kg/mu of liquid); 1650mg/L liquid medicine (the amount of liquid medicine 45-60kg/mu) was used for spraying during the ridge closure period of stems and vines. It can effectively control the growth of adventitious roots on sweet potato stems and vines, promote the thickening of stems and vines, accumulate and store nutrients in the tubers, and significantly increase the yield of fresh potatoes.

【13】Notes

①High-dose can be used for strong plant growth.

② When applied to tobacco, it should be used immediately or shortly after topping (topping) of tobacco, to avoid contact between the liquid and tobacco leaves, and only need to be used once throughout the growing season.

③Do not use it when the humidity is too high or the temperature is too high.