What Makes Nicosulfuron an Effective Post-Emergence Herbicide for Corn?

Introduction

Nicosulfuron is a selective post-emergence herbicide widely used in maize (corn) cultivation to control annual and perennial grasses, as well as some broadleaf weeds. Its high efficacy, low use rate, and crop safety make it a popular choice for modern weed management programs.

Product Information

• Name: Nicosulfuron

• Chemical Name: 2-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-N,N-dimethylnicotinamide

• CAS Number: 111991-09-4

• Appearance: Off-white crystalline solid

• Formulations: OD (Oil Dispersion), SC (Suspension Concentrate), WDG (Water Dispersible Granule)

• Solubility: Low solubility in water; stable under normal conditions

Key Features

• Selective for maize: Minimal crop injury when used properly

• ⚡ Post-emergence activity: Controls actively growing weeds

• Systemic action: Translocates to roots and shoots for complete control

• Low use rate: Effective at grams-per-hectare levels

• Compatible with tank mixes for enhanced weed spectrum

Applications

Mode of Action

Nicosulfuron inhibits acetolactate synthase (ALS), an enzyme essential for amino acid biosynthesis in weeds. This stops cell division and growth, leading to gradual weed death while sparing the maize crop.

Advantages

• Strong grass weed control in maize fields

• Broad application window (2–8 leaf stage of corn)

• Safe for rotational cropping when label intervals are followed

• Reduces need for multiple herbicide applications

Limitations

• Limited effect on established broadleaf weeds

• Risk of weed resistance if overused

• Requires precise application to avoid injury on stressed corn plants

FAQs

Q: Can nicosulfuron be mixed with broadleaf herbicides?
A: Yes, it is often tank-mixed with herbicides like dicamba or atrazine for broader weed control.

Q: What are the crop rotation restrictions?
A: Follow label guidelines; typically 3–10 months for sensitive crops like soybeans or vegetables.

Q: How soon after application does weed death occur?
A: Visible symptoms appear within 5–10 days, with complete control in 2–3 weeks.

Conclusion

Nicosulfuron is an essential herbicide for corn growers seeking reliable grass weed control. Its systemic action, crop selectivity, and compatibility with tank mixes make it a core component of effective post-emergence weed management programs.