Control of yield and quality of common buckwheat by soil water conditions

为了提高荞麦产量和品质，在不同土壤水分条件下，对普通荞麦品种信野1号进行了栽培试验。在较高水分条件下生长的荞麦植株表现出对氮素的吸收增加，并倾向于具有更大的生物量和产量。相反，在干旱条件下生长的水稻吸收的氮素较少，花的受精率较低，前者导致较小的生物量，后者导致较低的产量。结果表明，在土壤水分过高的条件下，荞麦植株的倒伏状况与主茎粗细密切相关。因此，建议采取水分管理措施，尽可能控制土壤水分，避免茎粗减少，以提高产量和品质。

Common buckwheat variety Shinano No.1 was cultivated under various soil moisture conditions aiming at the improvement of yield and grain quality. Buckwheat plants grown under relatively excessive moisture conditions showed increased nitrogen absorption and tended to have larger biomass and yield. In contrast, those grown under dry conditions showed smaller amont of nitrogen absorption and lower fertilization rate of flowers, the former resulting in smaller biomass and the latter resulting in lower yield. Lodging registance of buckwheat plants grown under excessive soil moisture condtions was clarified to be closely correlated to the thickness of main stem. Therefore, water management to control soil moisture as high as possible avoiding decrease in stem thickness was suggested to improve both yield and grain quality.