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日本自明治初期至今90年来,水稻产量(按糙米计算)每10公亩由200公斤上升到450公斤,提高达2倍以上。单位面积产量的上升,有赖于优良品种的育成、土壤改良、提高地力病虫害防除技术等的进步。在栽培技术中的施肥技术特别是施肥量的增大对增加产量的关系密切。日本北部地区近几年来产量显著提高,是由于耐寒性品种培育成功,保护秧苗技术的发展,成熟期早,避晃了冷寒为害。但寒冷地区水稻充
In the 90 years since the Meiji Period in Japan, the output of rice (calculated as brown rice) has risen from 200 kg to 450 kg per 10 wereles, an increase of more than two times. The increase in yield per unit area depends on advances in fine breed breeding, soil improvement, and improvement of soil fertility and pest control techniques. Fertilizing techniques in cultivation techniques, especially the increase of fertilizer, are closely related to the increase of yield. In northern Japan, the yield has been significantly increased in recent years due to the successful cultivation of cold-tolerant cultivars, the development of seedling protection technology, and the maturity of early seedlings, which have avoided the cold and damaging effects. However, cold paddy rice