Analysis of agricultural field and area for large-sized re-consolidation of paddy field.

1963年开始的土地整理项目已将40%的水田调整为100 m x 30 m的矩形，并接入灌溉沟和排水渠。将已调整的耕地重新整理成大面积耕地，大面积耕地的形成还存在着一些亟待解决的问题，如耕地权向核心农户集中的方式、土地平整的精确性等。因此，调查人员分析了三个模型领域，最近巩固的大型领域，和网格数据库。野尻区的200米x 40米的领域已经变成了较小的地块，其长边的长度小于200米，分割的单位是相同的替代地段。然后，排水渠的可达性下降，需要额外建造排水渠。水间区的长边长度也是200 m，但在长边和短边都设有沿着两用渠，因此在将田地划分为小块时不需要额外建造排水渠。高须和州区的长边长度为125 m，没有发生划分，相反，为提高工作效率，对样地进行了拼接。关东地区60%的稻田可整理成大面积田，近60%的稻田可引进积水直播技术，在此条件下，旱稻可在25%的稻田中推广，并指出了在该地区和耕作方式条件下的最佳小区规模和灌溉排水方式。

Land consolidation project started 1963 has adjusted 40% of paddy field into 100m x 30m rectangular shape, accessing irrigation ditch and drainage canal. And some of the already adjusted field is re-consolidated into large-sized field.Making large-sized field has some problems which should be solved, such as method of concentration of cultivation right to core farmer, and preciseness of land levelling. So, the investigators analyzed three model fields, recently consolidated large-sized field, and mesh data bases.200m x 40m field of Nojiri district have changed into smaller plots whose length of longer side is less than 200m and unit of division is same as substitute lot. Then accessibility to drainage canal had decreased and additional constructions of drainage canal became needed. Length of longer side of Mizuma district is also 200m, but dual-purpose canal is equipped along both longer and shorter sides, so additional construction of drainage canal was not needed when the field was divided into smaller plots.Length of longer side of Takasu-waju district is 125m and division was not occurred, on the contrary, binding of plots has been happened for increasing working efficiencies.The results of mesh data analysis are as follows;60% paddy field of Kanto area can be consolidated into large-sized field, and technique of direct seeding in ponding condition can be introduced in almost of 60% field, and that in dry condition can be introduced in 25% of paddy field with those conditions.In conclusion, the fittest plot size and method of irrigation and drainage are pointed out in condition of location and farming style.