**4. Discussion**


It is the first time, to our knowledge, that the effect of rototill blades on soil and straw after deep rototilling has been analyzed using tillage soil stratification to describe the effect of rototill blades on soil and straw in a rice-wheat rotation. This study reveals the interaction between the rototill blade and the soil and straw, a finding that will assist in the development of technologies for deep rototill straw burial operations. In addition, the design of deep rototill blades with improved blade-breaking energy and increased straw mulching rates could lead to the provision of good seedbeds.
