为了有效防治农田土壤风蚀，对作物进行高留茬处理和通过各种措施增加地表粗糙度，可以达到最大的防风蚀作用。
In order to control the wind erosion, the measure to enlarge the stubble height and topsoil roughness is most effective.
结果表明：工件进给速度对表面粗糙度的影响最大，切削深度和刀具前角次之，工件硬度影响最小。
The results show that the effects on surface roughness are feed speed, depth of cutting , tool rake angle and parts hardness in turn.
利用风速廓线法测定小麦不同生长期的空气动力学粗糙度：青苗期的平均粗糙度最大，为6。
Using wind velocity profile law determinate the aerodynamic roughness length of wheats different growth periods: the average roughness of shooting period, is 6.
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