Effect of topdressing at the ripening stage and application of leaf nitrogen content analyzer for fertilization of wheat [Triticum aestivum]
2002
"Sawada, T. (Hyogo-ken. Agricultural Inst., Kasai (Japan)) | Miyoshi, A. | Yoshikawa, T. "
"(1) By topdressing at the ripening stage (TRS) .application of nitrogen 0.4kg/a at 10 days after the heading stage, date of maturity was delayed in year of lower tempereture. (2) TRS also increased the number of ears, the thousand-kernel-weight and the yield by 10%, but not in the years where heading was delayed by lower temperatures. (3) With TRS, when the increasing rate of the content of protein in wheat grain was higher, the quality was lower because of the increasing grassy grain content. (4) To analyse wheat leaves with a Leaf Nitrogen Content Analyser (CCN) was used. The CCN value roughly indicated the nitrogen content in the wheat leaf, and was highly related to color value. Accordingly, it was better that the CCN value was used instead of the color value for nitrogen content. (5) It is suggested that topdressing at the ripening stage is effective when CCN indicates less than 3.0%,from 10 days after the heading stage."
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