Imaging spectroscopy for estimating sugarcane leaf nitrogen concentration

Elfatih M. Abdel-Rahman; Fethi B. Ahmed; Maurits van den Berg

doi:10.1117/12.800221

2 October 2008 Imaging spectroscopy for estimating sugarcane leaf nitrogen concentration

Elfatih M. Abdel-Rahman, Fethi B. Ahmed, Maurits van den Berg

Proceedings Volume 7104, Remote Sensing for Agriculture, Ecosystems, and Hydrology X; 71040V (2008) https://doi.org/10.1117/12.800221
Event: SPIE Remote Sensing, 2008, Cardiff, Wales, United Kingdom

Abstract

Imaging spectroscopy can provide real-time high throughput information on growing crops. The spectroscopic data can be obtained from space-borne, air-borne and handheld sensors. Such data have been used for assessing the nutritional status of some field crops (maize, rice, barely, potato etc.). In this study a handheld FieldSpec 3 spectroradiometer in the 350 - 2500 nm range of the electromagnetic spectrum was evaluated for its use to estimate sugarcane leaf nitrogen concentrations. Sugarcane leaf samples from one variety viz., N19 of two age groups (4-5 and 6-7 months) were subjected to spectral and chemical measurements. Leaf reflectance data were collected under controlled conditions and leaf nitrogen concentration was obtained using an automated combustion technique (Leco TruSpec N). The potential of spectroscopic data for estimating sugarcane leaf nitrogen status was evaluated using univariate correlation and regression analyses methods with the first-order reflectance across the spectral range from 400 to 2500 nm. The variables that presented high correlation with nitrogen concentration were used to develop simple indices combining reflectances of 2-wavelengths. Simple linear regression was then used to select a model that yielded the highest R². These were the R₇₄₄ / R₂₁₄₂ index for the 4-5 months old cane crop and the (R₂₂₀₀ - R₂₀₂₅) / (R₂₂₀₀ + R₂₀₂₅) index for the 6-7 months old cane crop, with R² of 0.74 and 0.87, respectively.

Citation Download Citation

Elfatih M. Abdel-Rahman, Fethi B. Ahmed, and Maurits van den Berg "Imaging spectroscopy for estimating sugarcane leaf nitrogen concentration", Proc. SPIE 7104, Remote Sensing for Agriculture, Ecosystems, and Hydrology X, 71040V (2 October 2008); https://doi.org/10.1117/12.800221

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