日本水田机械化新技术（上）日本的水稻生产。自１９４５年以来发生了很大变化：水稻产量已由３０００ｋｇ／ｈｍ２提高至５０００ｋｇ／ｈｍ２；年需作业时间已由２０００ｈ／ｈｍ２减少至４００ｈ／ｈｍ２，而先进的规模较大的农户甚至降至１００ｈ／ｈｍ２。截至１９９... Paddy Field Mechanization in Japan (Part 1) Rice Production in Japan. Significant changes have taken place since 1945: rice production has increased from 3000 kg / hm2 to 5000 kg / hm2; annual operational requirements have been reduced from 2000 h / hm2 to 400 h / hm2 while advanced large-scale farmers have even been reduced to 100 h / Hm2. As of 199 ...