2026 Volume 95 Issue 1 Pages 18-27
Abstract: To establish a cropping method for high and stable quality of bread wheat (Triticum aestivum L.) in paddy field, we investigated the effects of the preceding crop and nitrogen fertilization method on the yield and bread-making traits in bread wheat cultivar ‘Yumekaori’. The wheat grown in fields following soybean had higher yield, higher grain protein content, higher sodium dodecyl sulfate (SDS)-sedimentation volume, and better bread-making quality than the wheat grown in the fields following rice. Nitrogen topdressing at the flowering stage increased grain protein content and SDS-sedimentation volume, in both the wheat grown in the fields following soybean and rice. The relationship between grain protein content and SDS-sedimentation volume was not different between the wheat grown in the fields following soybean and rice, suggesting that bread-making quality improved to the same extent when grain protein content was increased by topdressing, regardless of the preceding crops. In addition, the wheat grown in the fields following soybean did not improve the bulk density and the grain ash content compared with the wheat grown in the fields following rice. Furthermore, in the wheat grown in the fields following soybean, the grain ash content increased by lodging due to the long culm, and the grain protein content increased above the appropriate value for bread wheat in the condition of high nitrogen fertilization. It is considered necessary to reduce the amount of nitrogen fertilizer to prevent lodging and control the grain protein content in the bread wheat fields following soybean.
