| Basing on the research of conservation tillage experiment in the semi-arid areas of the Loess plateau from 2001 to 2005,different tillage methods influent to the physical and chemical characters of the soil surface were compared and evaluated.Results showed that the treatment NTS can decrease the soil bulk density,increase the soil porosity and the soil saturated hydraulic conductivity,and enhance the soil organic matter.The NTS has the best effect for holding capacity of water and fertilizer,can create a comfortable condition for the crops. |