Inflow And Background Of U-Shaped Iron Shovel Blades In Kofun Period

A major turning point in exploring the process of agricultural development and the increase in productivity in ancient society was the appearance of an iron shovel blade, which was made of iron, at the end of the wooden farming tool. In the Japanese archipelago, the iron shovel blade can be divided into a square plate iron shovel blade made from the middle of the Yayoi period and a U-shaped iron shovel blade introduced from the southern part of the Korean Peninsula in the middle of the Kofun period. In the early middle of the Kofun period, U-shaped iron shovel blades were introduced to the Japanese archipelago from the southern part of the Korean Peninsula, and cultivation and large-scale development of areas other than wetlands are carried out in the archipelago. As a result, it was transformed from dry field-centered agriculture to paddy field-centered agriculture, and it was used as a reference material to distinguish the period between the early and mid-Kofun period, creating exceptional social changes. The 凹-shaped iron shovel blade is represented by the Imamitsu-groove 2 excavated items in Fukuoka Prefecture, and the U-shaped iron shovel blade is represented by the Noji 3 tomb in Fukuoka Prefecture and the Kodera 6 Tomb of Fukuoka Prefecture excavated items. The U-shaped iron shovel blade was introduced into the Japanese archipelago due to physical exchanges with the Korean Peninsula that have continued since the Yayoi period. At that time, however, there were many cases of excavation with a U-shaped iron shovel blade and pitchfork, but only the pitchfork was selected and the traces of inflow were found in Osaka Prefecture It is confirmed at the Sikinzan tomb. A square plate iron shovel blade was excavated from this tomb, and it seems that the U-shaped iron shovel blade did not flow in. If physical exchanges had led to an influx into the Japanese archipelago, it would have already flowed into the Japanese archipelago at this time. Therefore, I think it is necessary to consider inflows from other aspects rather than physical exchanges. In this way, it is noteworthy that the incident was related to King Gwanggaeto's Goguryeo expedition to the south. In conjunction with this period, social changes are greatly confirmed as war-related tools such as suhye, harness, weapons, and armour, new blacksmiths and metalworking techniques, and tools related to agricultural and civil engineering work are delivered from the Japanese archipelago. These changes are difficult to grasp without the movement of human resources. The U-shaped iron shovel blade is also considered to be a physical evidence left by people who immigrated to the Japanese archipelago amid the movement of human resources.