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覆盖和等高垄作相结合,不但收到防止水蚀、风蚀和地表蒸发失水的作用,而且还收到免灌高产的效果。初步结果证明,在免耕操作中,必须依靠地表长期保持全面覆盖的状态,才能消灭由辐射热日周期变化所引起的土壤内部水热动态无法稳定少变白局面,只有土壤内部水分居于长期稳定少变的状态,才能做到有雨滴水归田,无雨又能最大限度地阻止地面蒸发失水。在这种情况下,由于低吸水势状态土壤较之高吸水势状态土壤下渗快,回润也快。覆盖物的存在,可以使土壤在任何区域、任何气候下都永远保持松软湿润状态,既不怕旱,也不怕涝,表现出土壤大水库的卓越功能,保证高产高收。
Coverage and combination of high ridge, not only received the role of preventing water erosion, wind erosion and surface evaporation of water loss, but also received the effect of irrigation and high yield. Preliminary results show that in the no-till operation, we must rely on the long-term full coverage of the earth surface in order to eliminate the hydrothermal internal dynamics of the soil caused by the radiative heat cycle can not be stable and less white, only the soil moisture in long-term stability Little change in the state, in order to achieve a rain drip return to the field, no rain but also to maximize the ground to prevent evaporation loss. In this case, the return runoff is also faster due to the lower infiltration rate of the soil under the condition of low water absorption potential than that of the high water absorption potential state. The presence of the covering can keep the soil in a soft and humid state forever in any region and any climate. It is neither afraid of drought nor waterlogging, which shows the excellent function of a large soil reservoir and ensures high yield and high yield.