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

以提高产量和籽粒品质为目的，在不同土壤水分条件下对普通荞麦品种Shinano 1号进行了栽培。在相对湿度过高的条件下生长的荞麦植株对氮的吸收增加，生物量和产量趋于增加。而在干燥条件下生长的紫花苜蓿吸氮量较小，花的施肥量也较低，前者导致生物量较小，后者导致产量较低。明确了土壤水分过高条件下荞麦植株倒伏登记与主茎粗细密切相关。因此，建议采取水分管理，尽可能控制土壤水分，避免茎粗减少，以提高产量和粮食品质。

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.