Mechanism of action of allelochemicals

• Interfere with cell elongation
• Interfere with photosynthesis
• Interfere with respiration
• Interfere with mineral ion uptake
• Interfere with protein and nucleic acid metabolism

Use of Allelopathy in biological control of weeds:

• Use of cover crop for biological control
• Use of alleopathic chemicals as bio-herbicides

Effect of weed competition on crop growth and yield

• Crop growth and yield is affected
• Crop suffers from nutritional deficiency
• Leaf area development is reduced
• Yield attributes will be lowered
• Reduce the water use by the crop
• Affect the dry matter production
• Lowers the input response
• Causes yield reduction
• Pest and disease incidence will be more