半干旱地区采用少、免耕法能明显抑制冬前土壤水分蒸发。与传统耕法（３耕２耱）相比，０～１００ｃｍ土层免耕覆地膜、免耕覆秸秆和２耕１耱冬前分别少蒸发水分３７．２２ｍｍ、１６．４４ｍｍ和１１．１１ｍｍ，从而对春播时土壤墒情产生较大影响。由于少、免耕能有效地保墒，故能明显提高作物产量。上述３种少、免耕法分别较对照增产４９．２％、２９．４％和１４．５％，在抗旱生产上有重要意义 Semi-arid areas use less, no tillage method can significantly inhibit the evaporation of soil moisture before winter. Compared with the traditional tillage (3 tillage and 2 tillage), the water content of 37.22mm, 16.44mm and 11.11mm were less in the 0-100 cm soil layer before no-tillage, Which has a greater impact on soil moisture during spring seasons. Because of less tillage can effectively soil moisture, it can significantly improve crop yields. The three kinds of no-tillage and tillage-free treatments increased yield by 49.2%, 29.4% and 14.5% respectively compared with the control, which is of great significance in drought-resistant production