## 1 Introduction
Conservative tillage is considered a way to reduce soil carbon emissions; the type includes much tillage, ridge tillage, zone tillage, and no-tillage. A main variant of the latter is direct drilling (sometimes termed zero-tillage). Not tillage the soil can prevent soil organic matter from being decomposed and mineralized, and through cultivation without land preparation, per hectare of land can store 0.3 to 0.5 metric tons of carbon annually [14]. Therefore, the land-free \"conservative tillage farming\" model has become a new cultivation model for carbon-reduction farming methods. [PERSON] et al. [15] indicate reducing tillage and no-tillage decrease CO\({}_{2}\) emissions by a 6-year average of 45% and 51%, respectively, compared with convention tillage. CO\({}_{2}\) emissions from a 4-year maize field was reduced by 35.9% under no-tillage compared with under convention tillage [16]. \"No-tillage agriculture\" is a method in which crops are planted directly without plowing the soil or cleaning up crop residues before planting. There are two types of non-land preparation plowing. One is no-tillage, which does not turn over the soil at all but lacks the loosening effect on the soil structure; the other is reduced tillage, which reduces the number of plowing times and limits the plow area, such as conservation plow. As long as the plowing area is controlled within 30% of agricultural land, we can retain 70% of the carbon in the soil. Shockwave tillage combines the advantage of zone tillage and no-tillage. On the other hand, since tillage promotes soil water evaporation, no-till methods can improve infiltration and reduce evaporation to maintain moisture in the soil for crop production in semi-arid and arid areas with limited water resources [17]. Deliberately creating a low-pressure area in front of high-pressure gas guides all gas molecules to move in this direction. Such gas movement is the so-called shockwave [18]. When the shockwave speed reaches Mach 1 (i.e., the speed of sound, about 340.3 m/s), it can be called a supersonic shockwave. The operation and experimental research of missiles, supersonic aircraft, space rockets, and various vacuum high-speed flows are all applications of supersonic fluids. At present, various research institutions and industries need to use the rapid compression of the high- and low-pressure ranges of the fluid to generate shockwaves [19]. To conduct operations or experiments on supersonic fluids, This research team has achieved many research results on generating and applying supersonic shockwaves. We have designed a new type of supersonic shockwave generator [20], which has the advantages of easy operation, high safety, and reusability. The developed shockwave monitoring system measures the shockwaves generated by this generator, which can have a speed of Mach 3-4 and an output pressure of up to 90 MPa [21]. We have taken advantage of the characteristics of this new type of shockwave generator that can generate high-pressure and high-speed shockwaves to conduct application research on high-pressure shockwave removal of pipe obstructions [22] and high-pressure shockwave-driven power generation [21]. To solve the current problems of soil loosening in the root zone of crops, this research used this new shockwave generator as the basis to propose a system architecture that can perform high-pressure shockwave soil-loosening and develop a high-pressure shockwave soil-loosening device. This device can first drill a hollow drill bit containing multi-directional holes into the soil near the roots of the crops and then generate high-pressure gas to impact the soil outside the drill bit to increase the soil pores and improve the soil ventilation quickly. Furthermore, we also conducted numerical simulations of shockwave soil loosening to explore the effectiveness of high-pressure shockwaves in improving soil aeration. On the other hand, we carried out some shockwave multi-directional impact experiments in a transparent acrylic water tank.