| タイトル | Effects of nitrogen fertilization on growth and reflectance characteristics of winter wheat |
| 著者（英） | Daughtry, C. S. T.; Hinzman, L. D.; Bauer, M. E. |
| 著者所属（英） | Purdue Univ. |
| 発行日 | 1986-02-01 |
| 言語 | eng |
| 内容記述 | The use of remote sensing to determine seasonal changes in agronomic and spectral properties of winter wheat canopies with different levels of N fertilization is investigated. Field experiments were conducted at Purdue Agronomy Farm, West Lafayette, IN during the 1978-1979 and 1979-1980 growing season. Spectral reflectance, total leaf N concentration, leaf chlorophyll concentration, leaf are index (LAI), and fresh and dry phytomass are measured and analyzed. Three distinct wheat canopies are detected for the O, 60, and 120 kg N/ha levels of fertilization; it is observed that with an increase in N the reflectance in the visible, and middle IR wavelengths decrease, and the IR reflectance is increased. The canopies with 120 kg N/ha display the highest LAI, maintain green leaf area the longest, and increase in fresh and dry phytomass. The relationship between spectral and agronomic variables is examined; the effect of changing chlorophyll concentration and LAI on the reflectance is studied. |
| NASA分類 | EARTH RESOURCES AND REMOTE SENSING |
| レポートNO | 86A26222 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/386099 |
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