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

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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.