Reflectance indices with precision and accuracy in predicting cotton leaf nitrogen concentration
| Autor: | Gretchen F. Sassenrath-Cole, K. Raja Reddy, Lee Tarpley |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Accuracy and precision
Calibration curve Near-infrared spectroscopy food and beverages chemistry.chemical_element Soil science engineering.material Biology biology.organism_classification Fiber crop Nitrogen chemistry.chemical_compound chemistry Chlorophyll Botany engineering Agronomy and Crop Science Plant nutrition Malvaceae |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 0011-183X |
| DOI: | 10.2135/cropsci2000.4061814x |
| Popis: | Diagnostic methods assaying leaf optical properties can aid rapid site-specific screening of crop nitrogen status. A set of calibration curves relating many 1.5-nm band reflectance ratios to cotton (Gossypium hirsutum L.) leaf N concentration was established from plants grown in sunlit growth chambers and at a range of nitrogen levels. Predicted and actual concentrations were compared by regression for a validation set of field-grown leaf samples from diverse genotypes. Only those ratios that combined a red-edge measure (700 or 716 nm) with a waveband of high reflectance in the very near infrared region (755-920 and 1000 nm) provided good precision (correlation) and accuracy (one-to-one relationship between predicted to actual values). Other indices that included a chlorophyll-based reflectance feature also had good precision but were less accurate than those obtained from the red-edgelvery-near-infrared reflectance ratios. |
| Databáze: | OpenAIRE |
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