中共中央关于深耕和改良土壤的指示中曾经指出:“水肥土种密”的中心是土.农业生产的发展,越来越要求人们掌握关于土壤的系统知识.要有效地改良土壤,必须进行土壤普查.要获得高额丰产,必须合理地利用土地.在人民公社化以后,需要根据大面积高额丰产和加速发展多种经济的要求制定土地利用规划,而土地利用规划必须以全面的土壤普查为基础. The Central Committee of the Communist Party of China has pointed out in its instructions on deepening and improving soils that the center of the soil and fertilizers is soil. The development of agricultural production increasingly requires people to have a systematic knowledge of soils. To effectively improve soils, soil Census.In order to obtain a high yield, we must make rational use of the land.After the people’s commune, we need to formulate a land use plan according to the requirement of large area, high yield and speeding up the development of various economies, and the land use plan must be based on a comprehensive soil census As the basis.