都江堰灌区稻、麦、油免耕研究综述郭大钺（都江堰管理局）精耕细作是我国传统的耕作方法，它通过对土壤进行及时地多犁多耙等精细作业，来达到为作物根系的生长活动创造良好的土壤环境，以促进农作物增产。这是在一定的历史时期、生产水平、技术条件下逐步演变形成的。但... Summary of Research on No-Tillage of Rice, Wheat and Oil in Dujiangyan Irrigation District Guo Dazhi (Dujiangyan Authority) Intensive farming is a traditional farming method in our country. It achieves the goal of creating favorable growth activities for crop roots through fine soil plowing and raking in time. Of the soil environment to promote crop yield. This is a certain historical period, the level of production, the gradual evolution of the formation of technical conditions. but...