Labor-saving Fertilizer Management for Securing High Grain Protein Content Without Topdressing at Jointing Stage and Full Heading in the Wheat Cultivar ‘ChikushiW2’ for Chinese Noodles

• Published in: Japanese Journal of Crop Science Vol. 90; no. 4; pp. 408 - 413
• Main Authors: Ishimaru, Tomomichi, Araki, Masato, Araki, Takuya
• Format: Journal Article
• Language: English; Japanese
• Published: CROP SCIENCE SOCIETY OF JAPAN 05.10.2021
• Subjects: 15N-labeled ammonium sulfate; Chinese noodle wheat; Controlled availability fertilizer; Grain protein content; Labor-saving fertilizer management
• ISSN: 0011-1848; 1349-0990
• DOI: 10.1626/jcs.90.408

To establish a labor-saving method of fertilization omitting topdressing at jointing (JS) and full heading (FHS) stage in the wheat cultivar ‘ChikushiW2’ for Chinese noodles, we investigated the nitrogen elution quantity corresponding to each growth period and the effect of controlled availability fertilizer applied at the tillering stage (TS) on the yield and quality. When the coated urea sigmoid type M; 20-day type fertilizer, S20, was buried at TS, the accumulated nitrogen elution quantity reached the standard JS nitrogen quantity from the flag leaf extraction stage (FLES) to the flowering stage. Therefore, we conducted a 15N-labeled ammonium sulfate experiment at JS and FLES. There were no significant differences in the nitrogen content, fertilized nitrogen utilization rate, yield and quality depending on the time of fertilizer application, as was obtained for the ear number, yield, and grain protein content. This suggested that S20 can be used as fertilizer at JS. The nitrogen elution quantity of S20 from FLES to 24 days after heading stage was slightly smaller than that of topdressing at FHS. However, the combination of fast-acting nitrogen fertilizer and controlled availability fertilizer applied at TS gave a grain protein content rate of more than 12% and almost the same growth and yield as the split dressing. We concluded that one-time topdressing at TS is practical and enough to omit fertilization at JS and FHS.