A method of nitrogen fertilizer application for winter-seeding cultivation of winter wheat
2005
Ogiuchi, K. (Iwate-ken. Agricultural Research Center, Kitakami (Japan)) | Sakuyama, K.
Winter wheat usually seeded in autumn was seeded before continuous snow cover and the most appropriate method of nitrogen (N) fertilization was examined using variety "Nanbukomugi" . In the plants supplied with N fertilizer at seeding time, the growth increment at maturity and yield were higher than in those supplied with N just after the snow melted. The yield increased with increasing amount of N fertilizer applied. In the plants seeded before continuous snow cover and supplied with 10 gN/square m at seeding time, the yield was the same as or higher than that in the plants seeded in autumn. This is probably because early growth was promoted by a sufficient amount of N which was released from the fertilizer applied at seeding time. The protein content of the grains was 11 % or more when N fertiliser was supplied at seeding time, and it increased with increasing amount of N applied. In the plants supplied with N fertilizer at seeding time, the appearance quality of the grains was better, and the lodging degree was lower than those in the plants supplied with N fertilizer just after the snow melted. From these results, we recommend the application of N fertilizer at seeding time at 8-10 gN/square m to increase die yield.
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