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Changes in vertical distribution of spectral reflectance within Spring barley canopy as an indicator of nitrogen nutrition, canopy structure and yield parametrs
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SYSNO ASEP 0430099 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Changes in vertical distribution of spectral reflectance within Spring barley canopy as an indicator of nitrogen nutrition, canopy structure and yield parametrs Author(s) Klem, Karel (UEK-B) RID, ORCID, SAI
Rajsnerová, Petra (UEK-B) RID, SAI
Surá, Kateřina (UEK-B) RID, SAI, ORCID
Míša, P. (CZ)
Křen, J. (CZ)Source Title Agriculture (Poľnohospodárstvo) - ISSN 0551-3677
Roč. 60, č. 2 (2014), s. 50-59Number of pages 10 s. Publication form Print - P Language eng - English Country SK - Slovakia Keywords Hordeum vulgare ; spectral reflectance ; vertical gradient ; vegetation indices ; nitrogen ; grain yield ; protein content Subject RIV GC - Agronomy R&D Projects QI111A133 GA MZe - Ministry of Agriculture (MZe) TA02010780 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Institutional support RVO:67179843 - RVO:67179843 DOI 10.2478/agri-2014-0006 Annotation The main objective of this study was to evaluate the spectral reflectance in the vertical profile of spring barley canopy at the booting growth stage and to determine how the reflectance gradient changes in relation to crop density and nitrogen (N) nutrition. Vertical gradients of spectral reflectance were studied in field trials with three sowing densities (2, 4 and 6 million of germinating seeds/ha) and two levels of N nutrition (0 and 90 kg/ha). It was found that differences in vegetation indices caused by N nutrition are most pronounced in the second and third leaf from the top, and these increase with increasing sowing density. The vertical gradient of reflectance, specifically the ratio between the leaves F-3/F-1 for vegetation indices based on red-edge reflectance, represents a reliable indicator of number of ears per area unit (R = –0.87 for Normalised Red Edge-Red Index (NRERI) and –0.93 for Zarco-Tejada and Miller Simple Ratio Index (ZM)). A close relationship to ear productivity was found almost for all observed vegetation indices and any leaf in vertical profile (R = 0.79–0.97). In contrast, the prediction of protein content in barley grain was the most reliable when the red-edge reflectance indices (ZM and NRERI) particularly from upper three leaves were used (R = 0.81–0.88). The results show that the knowledge of reflectance heterogeneity in the vertical profile of canopy can significantly contribute to the interpretation of the measured data, to the differentiation of the N nutrition effect from the response to canopy density, and finally to a more accurate estimation of yield parameters and protein content in grain. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2015
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