Harbicide are chemicals used to control or eliminate unwanted plants (weeds) that compete with crops for nutrients, water, sunlight, and space.

?? What do weeds do?

Weeds harm crops by:

• Taking essential nutrients from soil
• Blocking sunlight
• Reducing crop growth and yield
• Making harvesting difficult

?? How do herbicides work?

1. Pre-emergence Herbicides
→ Applied before weeds grow
→ Stop weed seeds from germinating

2. Post-emergence Herbicides
→ Applied after weeds appear
→ Kill existing weeds

?? Types of Herbicides

1. Selective Herbicides
→ Kill specific weeds without harming crops
→ Example: targets broadleaf weeds in wheat

2. Non-selective Herbicides
→ Kill all plants (weeds + crops)
→ Used in empty fields or industrial areas
→ Example: Glyphosate

?? Why are herbicides important?

• Increase crop yield
• Reduce competition from weeds
• Save time and labor (less manual weeding)
• Improve overall crop quality