Q13.What is allelopathy? Discuss its role in major cropping systems of irrigated agriculture.

Allelopathy is a biochemical interaction where plants release allelochemicals that influence the growth, survival, or reproduction of other plants. Mechanisms include root exudates, volatilization, leaching, and residue decomposition.

Role in Irrigated Agriculture

In irrigated systems, allelopathy offers natural weed suppression (e.g., rice, wheat), pest/disease control, and improved nutrient cycling. However, it can also cause autotoxicity in monoculture, reducing yields, and adversely affect subsequent or intercropped species. Water availability critically influences allelochemical production and transport.

Sustainable Utilization

Utilizing allelopathic crops in rotations, intercropping, and cover cropping provides a sustainable strategy to minimize reliance on synthetic inputs, enhancing ecological balance and promoting resilient cropping systems.

Understanding allelopathy's complex role is crucial for developing environmentally sound agricultural practices in irrigated regions.