The highest rice-producing district of West Bengal is Burdwan.

Reasons for Burdwan being the highest rice-producing district:
1. Geographical location: Burdwan district is located in the fertile Gangetic plains, which offer favorable conditions for rice cultivation. The soil in this region is alluvial and rich in nutrients, making it ideal for rice farming.

2. Irrigation facilities: Burdwan has well-developed irrigation facilities, including canals, tube wells, and dams. These irrigation systems ensure a regular water supply to the paddy fields, which is crucial for rice cultivation.

3. Agricultural practices: Farmers in Burdwan have adopted modern agricultural practices, including the use of high-yielding varieties of rice seeds, improved farming techniques, and proper fertilization. These practices enhance productivity and contribute to higher rice production.

4. Government support: The state government of West Bengal has implemented various agricultural schemes and programs to support rice farmers in Burdwan. These initiatives include providing subsidies on seeds, fertilizers, and machinery, as well as offering technical assistance and training to farmers. Such support encourages farmers to increase rice production.

5. Rice research and development: Burdwan is home to agricultural research institutes and agricultural universities that focus on rice research and development. These institutes conduct studies to improve rice varieties, develop pest and disease control measures, and provide training to farmers. The presence of such research institutions contributes to the district's high rice production.

6. Market access: Burdwan has good connectivity to nearby markets and transportation facilities, enabling farmers to sell their produce easily. This accessibility encourages farmers to invest in rice cultivation, as they can readily sell their harvest and generate income.

Overall, the combination of favorable geographical conditions, irrigation facilities, modern agricultural practices, government support, research and development efforts, and market access has made Burdwan the highest rice-producing district in West Bengal.