| Correlation between agronomic parameters and spectral vegetation index in winter wheat under different nitrogen levels |
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| DOI：10.7606/j.issn.1000-7601.2005.04.04 |
| Key Words: winter wheat vegetation index leaf area index chlorophyll content biomass |
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| Abstract: |
| The spectral reflectance of winter wheat canopy under different nitrogen levels and at different periods was measured by using the spectrometer Field Spec to evaluate the agronomic parameters including leaf area index (LAI） ，chlorophyll content (CHL） ，chlorophyll density (CHL ．D） ，fresh overground weight and dry overground weight．Furthermore，the variation of spectral vegetation index of winter wheat under different nitrogen levels and the correlation between agronomic parameters and spectral variables were analyzed．The results showed that LAIand chlorophyll density were strongly correlated with ratio vegetation index (RVI） and normalized difference vegetation index (NDVI） ，chlorophyll content was significantly correlated with RVI and NDVIat heading period (P＜0．01） ，while fresh overground weight and dry overground weight were strongly correlated with RVI and NDVIduring rising to booting period．These results may provide references for predicting the agronomic parameters by using the spectral vegetation index． |