The results from the calculation and field experiments indicated that by using such type reamer, the machine could cut up straw and break the root of crop in the soil into pieces, and mix round them with soil at the same time.

• 计算和田间试验结果表明，该刀具作用于根茬时刀头速度大，采用该刀具的还田机既可切碎秸秆，又能同时入土破茬，并实现了碎茬与土壤的均匀混拌。