Effects of Different Tillage Managements on Soil Temperature in Cold and Dry Farming Areas

For researching the effect of different tillage managements on soil temperature in cold and dry farming areas,the test plot was established.Four treatments were mulch with harrow tillage,mulch with subsoiling and mulch with No-tillage,conventional tillage CK.The testing results indicated there was a visible regulating effect in soil temperature with conservation tillage.From April 21th to May 20th,the soil temperatures of conservation tillage was higher than conventional tillage evidently,the daily average soil temperatures of mulch with harrow tillage,mulch with subsoilingand mulch with No-tillage were higher 0.58℃,1.22℃ and 1.67℃ than conventional tillage respectively.After the end of May,the soil temperature of conservation tillage was lower than conventional tillage evidently.Compared with conventional tillage,the soil temperatures of each layer underground 5,10,15 and 20 cm were increased by 0.7～2.6℃,0.5～1.4℃,0.3～1.1℃ and 0.1～1.0℃ respectively.The regulating effects in soil temperature were reduced with the increase of the depth of soil layer.