The study about the route of the spread of a rice cultivation in the Jomon period

1.琉球群岛稻种的开始时间和稻种繁殖途径的检验。对新疆34个站点的土壤和碎片进行了植物蛋白石分析。琉球群岛，以及该地区古苏时期和海冢时期水稻作物的存在。因此，下面的事情变得清晰起来。1)琉球诸岛在古苏时期开始种植水稻。2)植物蛋白石的形态分析结果表明，古苏古时期栽培的水稻亚种为粳稻。从以上结果可以推测，经琉球群岛繁殖的水稻作物和海冢时期存在水稻作物的可能性很低。绳纹时代后半期九州北部地区水稻种植的存在。对九州北部地区13个遗址的土壤和碎片进行了植物蛋白石分析，认为绳纹时代后半期存在水稻作物。调查结果显示，在7个地点的样品中检测到水稻的植物蛋白石。这表明。在绳纹时代的后半期，水稻已经在九州北部传播开来。据此推测，绳纹时代的水稻作物传播到九州北部地区的可能性很大。

1.Time of a start of a rice crop of the Ryukyu islands and examination of the propagation path of a rice crop.Plant opal analysis was carried out about soils and shards which derived from 34 sites located in. the Ryukyu islands, and existence of a rice crop in Gusuku Period and Kaizuka Period in this area was considered.Consequently, the following things became clear.1)The rice crop was carried out in Gusuku Period throughout the Ryukyu islands.2)The result of morphlogical analysis of plant opal shows that the subspecies of the rice cultivated in Gusuku Period is japonica.From the above results, it is presumed that a possibility that the propagation of the rice crop by way of the Ryukyu islands and the existence of rice crop in Kaizuka Period is low.2.Existence of rice cultivation in north area of Kyushu in the later half of the Jomon period.Plant opal analysis was carried out about soils and shards which derived from 13 sites located in the north area of Kyushu, and existence of a rice crop in the later half of the Jomon period was considered.As a result of investigation, plant opal of rice was detected from samples of seven sites. This shows that. the rice crop had spread through northern part Kyushu at the later half of the Jomon period. And it is presumed that a possibility that the rice crop of the Jomon period spread to north area of Kyushu is high.