نبذة مختصرة : 【Objective】 The dense plough layer is difficult for airs and water to move into and out the root zone, hindering root penetration as a result. Deep loosening techniques, including the innovative air pressure subsoiling method, offer a solution by effectively breaking up this compacted layer. In contrast to traditional mechanical subsoiling, air-pressure subsoiling involves injecting high-pressure gas into the bottom of the plough layer. This paper studies the influence of air pressure on permeability of the loosen plough layer. 【Method】 Laboratory experiments were conducted to investigate the effect of air pressure subsoiling. We analyzed the mechanism underlying this process and assessed the impact of operating factors, including air jet pressure, bulk density of the plough layer, subsoiling position, and air jet direction, on loosening the soil. 【Result】 Among the factors we studied, subsoiling position had the most pronounced effect on soil permeability, and bulk density of the plough layer had the least impact. These factors collectively influenced the porosity of the loosened plough layer. Under the test conditions, when the bulk soil density was 1.8 g/cm3 and the subsoiling depth was 0.35 m, an air jet direction of 75° combined with a jet pressure of 2.2 MPa yielded the most effective results. Similarly, with the bulk density was 1.8 g/cm3 and subsoiling depth was 0.25 m, using a jet pressure 2.2 MPa was highly effective. 【Conclusion】 Deep loosening the plough layer by air injecting can increase the permeability of the plough layer and enhance its water storage capacity. Under the test condition, 75° is an appropriate angle to inject the air; injecting the air at the depth of 0.35 m is the most suitable for plough layer loosening.
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