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简介：Taking the capital as an example, the barren mountains and wild lands around the capital cannot grow rice or millet, but they are very suitable for the growth of potatoes, sweet potatoes, and corn. As long as they are sown on a large scale, the food problem around the capital can be solved immediately. Song Yingxing was an expert in potatoes, sweet potatoes, and corn, so Zhu Cixiang had to invite him.