Analysis on resistance effect of field surface wind velocity of conservation tillage farmland

In order to evaluate wind velocity resistance effect of conservation tillage farmland, an experiment was conducted on wind velocity resistance effect of field surface under conservation tillage compared with conventional tillage by means of movable wind tunnel. The influence of wind velocity resistance effect on field surface wind velocity profile was analyzed comparatively with different crop stubbles coverage. The results indicated that the wind velocity profiles of conservational tillage farmland surface with different crop stubbles coverage were obviously different from that of conventional tillage farmland, the wind velocity of conservational tillage farmland was 2.5-10 times less than that of conventional tillage farmland below the height of field surface 50 cm. The best height of wind velocity resistance was 0.1 m from field surface. The relative wind velocity reduction ratio reached to 76.32% when its vegetation coverage was 90%. The field surface wind velocity resistance effect strengthened with the increase of wind tunnel center speed and got up to the best level when wind velocity was 12 m/s.