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Chemical Identification
Common Name
Nicosulfuron
中文通用名
烟嘧磺隆
IUPAC
2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide
CAS
2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamide
CAS No.
111991-09-4
Molecular Formula
C15H18N6O6S
Molecular Structure
Category
Activity
Nicosulfuron is absorbed by the leaves of treated plants and translocated to the meristematic tissue causing growth inhibition, discoloration, necrosis and, eventually, plant death. The product is most effective against grasses when applied between emergence and tillering. Broadleaf weeds are most effectively controlled when treated at the 2-3-leaf stage. Split applications can improve the efficacy of the product. Nicosulfuron is rainfast within six hours. DuPont recommends the use of adjuvants such as non-ionic surfactants or crop oil concentrates to enhance the activity of its granular product. Nicosulfuron has no residual activity, being quickly metabolised by plants.

Nicosulfuron shows high selectivity to maize, but treatment of maize crops with some soil insecticides sensitises the crop to nicosulfuron, resulting in crop damage. DuPont and ISK report that nicosulfuron is safe to soybeans planted in rotation with maize.
CropUse
Selective post-emergence control in maize of annual grass weeds,broad-leaved weeds and perennials grass weeds.
Premix
Metsulfuron-methyl+nicosulfuron
Nicosulfuron+atrazine+rimsulfuron
Nicosulfuron+dicamba+diflufenzopyr
Nicosulfuron+rimsulfuron
Nicosulfuron+thifensulfuron-methyl
Nicosulfuron+atrazine
Dicamba+Nicosulfuron
Nicosulfuron+Atrazine+Mesotrione
Fluroxypyr+Nicosulfuron+Atrazine
Nicosulfuron+Bromoxynil
MCPA-isooctyl+Atrazine+Nicosulfuron
Nicosulfuron+Amicarbazone
Nicosulfuron+S-metolachlor+Atrazine
Nicosulfuron+Terbuthylazine
Nicosulfuron+Dicamba+Fluroxypyr
Nicosulfuron+Halosulfuron-methyl
Mesotrione+Nicosulfuron+Halosulfuron-methyl
Nicosulfuron+Fluroxypyr-meptyl+Halosulfuron-methyl
Bromoxynil octanoate+Nicosulfuron+Fluroxypyr-meptyl
Nicosulfuron+Atrazine+Flumetsulam
Nicosulfuron+Atrazine+Clopyralid

Type

AI concn

Suspension concentrate (SC)

4.0% (w/v) (ISK)

Suspension concentrate (SC)

4.4% (w/v) (ISK

Bayer)

Water-dispersible granule (WG)

75% (w/w) (DuPont)

Physical Properties
Molecular weight:410.4g/mol; Physical form:Colourless crystals. Density:0.313 (bulk); Melting point:169-172℃; Flash point:>200℃ (Cleveland open cup); Vapour pressure:<8 × 10-7 mPa (25 ℃); Henry constant:<4.68 × 10-9 Pa m3 mol-1 (25 ℃); Partition coefficient(n-octanol and water):logP = -0.36 ( pH 5), -1.8 ( pH 7), -2 ( pH 9); pKa:4.6 (25℃); Solubility:In water 0.07 g/l. In acetone 18, ethanol 4.5, chloroform, dimethylformamide 64, acetonitrile 23, toluene 0.370, hexane <0.02, dichloromethane 160 (all in g/ kg, 25 ℃).; Stability:Hydrolysis DT50 15 d ( pH 5); BBR> 7 & 9.
Toxicology
Oral:Acute oral LD50 for male and female rats and mice >5000 mg/ kg. Percutaneous:Acute percutaneous LD50 for male and female rats >2000 mg/kg. Moderate eye irritant; not a skin irritant (rabbits); not a skin sensitiser (guinea pigs). The 75% formulation is not an eye irritant. Inhalation: LC50 for rats (4 h) 5.47 mg/l.
Environmental Profile

Bobwhite quail

LD50 >2,000 mg/litre

Rainbow trout [96 hrs]

LC50 >1,000 mg/litre

Bluegill sunfish [96 hrs]

LC50 >1,000 mg/litre

Bee [contact]

LD50 >20 mg/bee

Fate in soil:
The half-life of nicosulfuron in soil is 7-20 days.

Fate in aquatic systems:
Nicosulfuron is degraded by hydrolysis and by microbial action. It has a half-life of between 20 and 60 days.

Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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