Effects of seeding rate and nitrogen application rate on grain yield and protein content of the bread wheat [Triticum aestivum] cultivar 'Minaminokaori' in southwestern Japan
2009
Nakano, H.(National Agricultural Research Center for Kyushu Okinawa Region, Chikugo, Fukuoka (Japan)) | Morita, S.
We examined the effects of seeding rate, 50 or 150 seeds/square m, nitrogen (N) application rate at active tillering and jointing, 4 and 2 g N/square m, respectively, or none, and N application rate at anthesis, 0, 2, 4, or 6 g N/square m, on grain yield and protein content of a bread wheat cultivar, 'Minaminokaori', during the 2004-2005 crop season in southwestern Japan. Grain yield was similar at a seeding rate of 50 and 150 seeds/square m. It was higher when 4 and 2 g N/square m were applied at active tillering and jointing, respectively (4-2N), than when no N was applied at these stages (0-0N). However, it was not influenced by N application rate at anthesis. Grain protein content was similar at 50 and 150 seeds/square m. It was higher in 4-2N than in 0-0N. It was the highest when 6 g N/square m was applied at anthesis, followed by 4, 2, and 0 g N/square m. The SPAD value at anthesis was higher at 50 than 150 seeds/square m, but leaf area index (LAI) at anthesis was similar at 50 and 150 seeds/square m and protein content of grain was nearly the same at 50 and 150 seeds/square m irrespective of N application rate at anthesis. LAI and the SPAD value were higher in 4-2N than in 0-0N and the protein content of grain was also higher in 4-2N than in 0-0N irrespective of N application rate at anthesis. Therefore, both LAI and the SPAD value may be important traits related to the N application rate at anthesis suitable for yielding wheat grain with a high protein content.
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