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简介：Zhu Cixi could no longer suppress his excitement. The yield of rice, millet or wheat per acre was only 300 kilograms, and the highest would not exceed 400 kilograms. If replaced with corn, it would be doubled, and he could support twice as many people. If these three crops could be sown on a large scale in the north, the famine that plagued the Ming Dynasty would certainly be greatly alleviated.