Abstract
This study was conducted to explore whether hyperspectral data could be used to discriminate between the effects of different rates of nitrogen application to a potato crop. The field experiment was carried out in the Central Potato Research Station, Jalandhar, on seven plots with different nitrogen (N) treatments. Spectral reflectance was measured using a 512-channel spectroradiometer with a range of 395–1075 nm on two different dates during crop growth. An optimum number of bands were selected from this range based on band–band r 2, principal component analysis and discriminant analysis. The four bands that could discriminate between the rates of N applied were 560, 650, 730, and 760 nm. An ANOVA analysis of several narrow-band indices calculated from the reflectance values showed the indices that were able to differentiate best between the different rates of N application. These were reflectance ratio at the red edge (R740/720) and the structure insensitive pigment index (SIPI). To estimate leaf N, reflectance ratios were determined for each band combination and were evaluated for their correlation with the leaf N content. A regression model for N estimation was obtained using the reflectance ratio indices at 750 and 710 nm wavelengths (F-ratio = 32 and r 2 = 0.551, P < 0.000).
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Acknowledgments
The work is carried out under the “Precision Farming” project of Space Applications Centre (SAC). Authors are grateful to Dr R R Navalgund, Director, SAC, and Dr J S Parihar, Deputy Director, RESA and Mission Director, EOAM, SAC for their keen interest and encouragement. We are also grateful to Dr G S Kang, Head, CPRS and Dr S S Lal, Head, Crop Production Division, CPRI for their help to carry out the field experiment.
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Jain, N., Ray, S.S., Singh, J.P. et al. Use of hyperspectral data to assess the effects of different nitrogen applications on a potato crop. Precision Agric 8, 225–239 (2007). https://doi.org/10.1007/s11119-007-9042-0
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DOI: https://doi.org/10.1007/s11119-007-9042-0