The net profit from planting Doudan per acre is 2,000-3,000. The yield of bean sprouts per mu is about 100 kilograms, and the market price of bean sprouts is relatively high, about 50 yuan/jin. Then the income from one mu of land is 5,000 yuan. After excluding the cost, the net profit is about 2,000-3,000 yuan. . The cost of raising soybeans: The cost of soybeans is relatively cheap, almost negligible, around 20-30 yuan. In addition, there is the cost of bean eggs. In different seasons, the market price of bean eggs is actually different. For example, in spring it is 0.3 yuan/egg, but in summer it drops to 0.2 yuan/egg per mu. If you need to cultivate about 10,000 bean eggs on the local land, the cost will be between 2,000 and 3,000 yuan. If the breeding methods are different, the cost of anti-bird nets is also different. The cost of anti-bird nets for open-air breeding is about 1,000 yuan, while the cost of anti-bird nets for greenhouse breeding is about 800 yuan. Then there is the construction cost of the site. If it is open-air farming, there is no other construction cost, but if it is greenhouse farming, it will cost 6,500 yuan. So to sum up, the cost of greenhouse farming will be higher, about 9,300-10,300 yuan, while the cost of open-air farming will be around 2,100-3,100 yuan.