secondary tillage 也称表土耕作措施（surface tillage），是在 基本耕作基础上采用的入土较浅，作用强度较 小，旨在破碎土块、平整土地、消灭杂草，为 作物创造良好的播种出苗和生产条件...
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Even though potassium is stratified under reduced tillage, it is apparent that roots proliferate sufficiently near the soil surface to assume adequate potassium uptake by crops.
虽然在少耕制下，土壤钾有明显的分层分布但在土表附近，作物根系发达保证作物对钾有足够的吸收。
Soil aggregate degree increased with no-tillage years, especially in the surface layer.
土壤团聚度随免耕年限的增加而增加，表层增加更明显；
For analyzing the adhesion between soil and tillage tools, the profiles of pressure on the wave bulldozing plates were calculated, and we located the position of the maximum friction on the surface.
计算了波纹板表面的压力分布，并指出在土壤与农机具粘附系统中波纹形表面摩擦力最大的位置。
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