Abstract:
Abstract: There was the ecological reality that the precipitation amount basically meet the crop needs but the inter- and intra-annual precipitation was unevenly distributed in rainfed areas in south of Henan province, and poor tillage also limited agriculture development. The paper provided a theoretical basis in order to solve the problems of sowing drought, the winter and spring drought, and improve topsoil water, fertilizer, gas, heat and other factors. The effects of different tillage regimes on the soil temperature,water content, bulk density and yield of winter wheat in the rain-fed farming region in southern Henan of China was studied. The experiment was conducted from 2007 to 2015, with six treatments, i.e., T1(traditional tillage and cultivation), T2(non-straw-mulching for corn + straw mulching and non-tillage for wheat), T3(straw mulching for corn + non-tillage for wheat), T4(pre-sowing deep plough for corn + non-tillage for wheat), T5(straw mulching and pre-sowing subsoiling for corn + straw mulching and non-tillage for wheat) and T6(straw mulching and rotary tillage). The results showed that, straw mulching and subsoiling effectively improved soil water content, and reserved higher soil water content in 0-40 cm soil layer at the seeding stage. There were less difference of the average temperature among different treatments during the wintering period and turning green stage. Meanwhile, straw mulching and pre-sowing subsoiling for corn + straw mulching and non-tillage for wheat non-tillage regimes effectively reduced 0-40 cm soil bulk density. In the first three years, the yearly average yield of straw mulching (T5) was lower than T1(CK), while from the fifth fourth year, the yield of (straw mulching)T5 treatment started to increase by 2.02%、2.83%、10.93%、5.88%、1.97% from 2011 to 2015. These results suggests that (straw mulching)T5 regime can effectively use precipitation resources, and also increase soil fertility and yield of winter wheat in rainfed areas in southern Henan province.