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大力提高粮食产量是我国当前农业生产的首要任务,全国农业发展纲要(修正草案)中提出在黄河、秦岭、白龙江(青海境内)以北地区每亩平均年产量由1955年的150多斤增加到400斤的指标。北方的农作物复种指数低,长城以北是一年一熟,长城以南是二年三熟;且华北平原和松辽平原是我国主要的涝灾地区,一般年分受涝面积9,500多万亩(占全国易涝面积的92%;渤海湾沿岸还有一片盐碱地,因而北
Vigorously increasing grain production is the primary task of our country’s agricultural production. According to the National Outline for Agricultural Development (draft amendment), the average annual output per mu in the Yellow River, Qinling and Bailongjiang (within the territory of Qinghai) increased from 150 kilos in 1955 to 400 pounds of indicators. Crops in northern China have a low multiplier index, with a year in the north of the Great Wall and three crops in two years in the south of the Great Wall. The North China Plain and the Songliao Plain are the major areas affected by floods in China. Generally, the annual catch-up area is more than 95 million mu Accounting for 92% of the country’s flood-prone area; there is also a saline-alkali land along the coast of Bohai Bay and thus North