我省淮北地区有砂姜黑土2100万亩,占黄淮海平原砂姜黑土面积的44.7％。土壤比较瘠薄,耕作粗放,历史上有广种薄收习惯。五十年代初期,粮食作物以小麦为主,和高粱、大豆、山芋成为淮北四大作物。轮作方式以小麦—大豆(或山芋)—春高粱(或春山芋)的两年三熟制和小麦—大豆(或山芋)的一年两熟制为主体,部分田地实行小麦—夏季休闲的一年一熟制。这样的复种轮作方式,由于当时的生产条件和技术水平限制,在生产量低的情况下,基本上符合用地与养地相结合的耕作制度。但到五十年代中后期,盲目追求高产,扩大山芋面积和改种水稻,压缩了高粱、小麦、大豆面积。据宿 Huaibei area in our province has 21 million mu of sagoaceous black soil, accounting for 44.7% of the area of ​​shale black soil in the Huang-Huai-Hai Plain. The soil is barren, extensive farming, history has a wide range of thin harvest habits. In the early 1950s, the main grain crops were wheat, and sorghum, soybeans and potato became the four major crops in Huaibei. The cropping pattern is based on the two-year-old system of wheat-soybean (or potato) -chun sorghum (or spring potato) and the one-year ripening of wheat-soybean (or potato), and part of the field implements wheat-summer recreation Year cooked. Because of the production conditions and technical limitations of the time, the method of multiple crop rotation basically conformed to the tillage system combining land use with raising land in the case of low production. However, by the mid-to-late 1950s, blind pursuit of high yield, expansion of potato area and re-planting of rice reduced the area of ​​sorghum, wheat and soybeans. According to places