庄园里被免除上缴领主年贡以及公事负担的田地。地头及庄官的给田即属于免田。免田有多种形式，只免除公事者称杂役免田。
通过田间定位试验和土壤水分的测定，探讨了免耕和秸秆覆盖还田对小麦、油菜土壤水分利用效率的影响。
Through fixed field experiment and determinations of soil moisture, the field water utilization efficiency of wheat and rape seeds was discussed under no tillage and straw mulching.
施用除草剂可减少免耕玉米田杂草种类，抑制杂草生物量的增长。
Herbicide could decrease weed species and inhibit biomass growth significantly in non-tillage field.
保护性耕作是相对于传统耕作的一种新的耕作技术，是作物茎秆还田和免耕、少耕技术的结合。
The protective cultivation, which is relative to traditional cultivation, is a new cultivation technique which combines with crop straw incorporated into field, no-tillage and reduced tillage.
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