我老家也是70年左右粮食产量开始大幅度上升，就是楼下网友说的，种子，灌溉，化肥，农药以及种植方法的改进

来源: speedingticket 于 2021-05-23 16:39:56 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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