前言我市平原稻区,现有耕地66多万亩,土壤肥沃,水热条件优越,年日平均温度高于10℃的作物活跃期达240天以上,大于10℃的积温在5000℃左右,具备一年三熟的种植条件。但由于本区人口密度大,人均耕地面积小,过去侧重于提高单产,只能解决温饱问题。近年来,随着人们生活水平的提高,社会对农产品的数量和质量要求的提高有必要,建立合理的耕作制度,是发展农业生产的一项重要措施, Preface Our city plain rice area, the existing 660000 acres of arable land, fertile soil, water and heat conditions, the annual average temperature above 10 ℃ active period of crops more than 240 days, more than 10 ℃ accumulated temperature around 5000 ℃, With three conditions a year planted. However, due to the large population density and small per capita arable land in the area, the previous focus on raising yields was only to solve the problem of food and clothing. In recent years, with the improvement of people’s living standards, it is necessary for the society to raise the quantity and quality requirements of agricultural products. Establishing a reasonable farming system is an important measure for the development of agricultural production.