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一、日本甜菜生产发展概况 四十年代,由于日本重视发展农业,不断引进新技术,甜菜生产发展速度很快。1945—1949年,日本甜菜面积每年平均为21.9万亩,亩产只有456.65公斤,甜菜含糖量不到10％,属低水平阶段;五十年代甜菜生产水平有所提高,每年平均种植31.95万亩,每亩产量提高到1513.5公斤,含糖量12.4％;六十年代日本在甜菜生产上更换品种,增加化肥投放量,特别是积极推广纸筒育苗移栽技术,甜菜生产发展速度较快,平均每年种植面积达75万亩,亩产1953.5公斤,含糖量
First, the development of beet production in Japan In the forties, as Japan attaches importance to the development of agriculture, the continuous introduction of new technologies, beet production has developed rapidly. In 1945-1949, the average beet area in Japan was 219,000 mu per annum, with only 456.65 kg of mu per mu and less than 10% of sugar content in sugar beet. This is a low-level period. In the 1950s, the beet production level increased by an average of 319,500 Mu, yield per mu increased to 1513.5 kg, the sugar content of 12.4%; sixties the Japanese sugar beet production in the replacement of varieties, increase the amount of fertilizer, especially the positive promotion of paper tube seedling transplanting technology, beet production faster, The average annual planting area of 750,000 mu, 1953.5 kg per mu, sugar content