Take leeks as an example. It costs 20 kilograms per acre, plus fertilizer (500 yuan), pesticides (500 yuan), shed film (1,500 yuan), straw curtains (3,000 yuan), land rent ( 1,000 yuan) and other expenses, the first investment is about 7,000 yuan. (Excluding the cost of building a shed) The annual income per mu is 20,000 yuan.