抄録
Cultivation tests were carried out (at Kasukabe, in 1950) on summer buckwheat (Fagopyrum esculentum M. var. aestivum Makino), autumn buckwheat (F. esculentum M. var. autumnale Makino), diploid and tetraploid buckwheat, and Tartarian buckwheat (F. tataricum Gaertner), for the purpose of examining their rutin content. Chief studies were made on the relationship between sowing time and yield of crop and rutincontent and following results were obtained:
1) Both the summer and autumn buckwheat were found possible to cultivate twice a year, in the spring and autumn.
2) Both the summer and autumn buckwheat cultivated in the spring were found to have larger content of rutin and greater yield of rutin per 10 ares (Tables I and II).
3) Cultivation of autumn buckwheat in the spring was found to give a larger rutin content and greater yield of rutin per 10 ares (max. 3.49% and 1.896kg., resp.) than the cultivation of summer buckwheat in the spring (max. 3.13% and 1.291kg., resp.) (Tables I and II).
4) No apparent difference was observed between the diploid and tetraploid buckwheat as to the yield of crop, rutin-content, and yield of rutin per 10 ares (Table III), although, naturally, tetraploid organs (cotyledons, first foliage leaves, pollen grains, and stomata) were larger than those of the diploid (Table IV).
5) Rutin-content and yield of rutin per 10 ares of the Tartarian buckwheat were not necessarily greater than those of summer and autumn buckwheat (Table V).
