The state with the largest proportion of net irrigated area in the country is Uttar Pradesh.

Explanation:
Uttar Pradesh is the state with the largest proportion of net irrigated area in the country. This means that a significant portion of the agricultural land in Uttar Pradesh is irrigated, providing a reliable water supply for crop cultivation.

Reasons for Uttar Pradesh having the largest proportion of net irrigated area:

1. Geographical Features: Uttar Pradesh is situated in the northern part of India and is blessed with several major rivers like the Ganges, Yamuna, and their tributaries. These rivers provide a substantial water resource for irrigation purposes.

2. Well-developed Canal System: Uttar Pradesh has a well-developed canal system that helps in the efficient distribution of water to agricultural lands. The state has an extensive network of canals that are fed by the rivers, ensuring a consistent water supply for irrigation.

3. Large Dams and Reservoirs: Uttar Pradesh is home to several large dams and reservoirs that store water during the monsoon season and release it for irrigation throughout the year. These structures help in regulating the flow of water and managing water resources effectively.

4. Government Initiatives: The government of Uttar Pradesh has implemented various irrigation schemes and programs to promote agricultural development in the state. These initiatives aim to enhance the irrigation infrastructure, provide financial assistance to farmers, and improve water management practices.

5. Agricultural Practices: The farmers in Uttar Pradesh primarily practice intensive farming, which requires a reliable water supply. The availability of irrigation facilities encourages farmers to cultivate high-value cash crops and multiple cropping patterns, leading to increased agricultural productivity.

Conclusion:
Uttar Pradesh's large proportion of net irrigated area can be attributed to its favorable geographical features, well-developed canal system, large dams and reservoirs, government initiatives, and agricultural practices. These factors collectively contribute to ensuring a consistent water supply for irrigation, making Uttar Pradesh the state with the largest proportion of net irrigated area in the country.