Answer: Khagaria
Notes: Khagaria district of Bihar has the highest wheat productivity with 3960 kgs. per hectare. Wheat is a major rabi crop in Bihar, contributing significantly to the state's food security. Other districts like Rohtas, Kaimur, and Bhojpur also contribute significantly to the total wheat production in Bihar. The state government has taken initiatives like distribution of subsidized seed and planting material to improve wheat production in the state.
