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Statements

Subject Item
n2:RIV%2F67179843%3A_____%2F14%3A00430099%21RIV15-MZE-67179843
rdf:type
n15:Vysledek skos:Concept
dcterms:description
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. 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.
dcterms:title
Changes in vertical distribution of spectral reflectance within Spring barley canopy as an indicator of nitrogen nutrition, canopy structure and yield parametrs Changes in vertical distribution of spectral reflectance within Spring barley canopy as an indicator of nitrogen nutrition, canopy structure and yield parametrs
skos:prefLabel
Changes in vertical distribution of spectral reflectance within Spring barley canopy as an indicator of nitrogen nutrition, canopy structure and yield parametrs Changes in vertical distribution of spectral reflectance within Spring barley canopy as an indicator of nitrogen nutrition, canopy structure and yield parametrs
skos:notation
RIV/67179843:_____/14:00430099!RIV15-MZE-67179843
n3:aktivita
n18:I n18:P
n3:aktivity
I, P(QI111A133), P(TA02010780)
n3:cisloPeriodika
2
n3:dodaniDat
n11:2015
n3:domaciTvurceVysledku
n9:6948537 n9:7674864 n9:4857372
n3:druhVysledku
n17:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n12:predkladatel
n3:idSjednocenehoVysledku
6832
n3:idVysledku
RIV/67179843:_____/14:00430099
n3:jazykVysledku
n4:eng
n3:klicovaSlova
Hordeum vulgare; spectral reflectance; vertical gradient; vegetation indices; nitrogen; grain yield; protein content
n3:klicoveSlovo
n8:vegetation%20indices n8:spectral%20reflectance n8:vertical%20gradient n8:nitrogen n8:grain%20yield n8:protein%20content n8:Hordeum%20vulgare
n3:kodStatuVydavatele
SK - Slovenská republika
n3:kontrolniKodProRIV
[839B7EDBA338]
n3:nazevZdroje
Agriculture (Poľnohospodárstvo)
n3:obor
n14:GC
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:projekt
n10:QI111A133 n10:TA02010780
n3:rokUplatneniVysledku
n11:2014
n3:svazekPeriodika
60
n3:tvurceVysledku
Míša, P. Křen, J. Rajsnerová, Petra Klem, Karel Novotná, Kateřina
s:issn
0551-3677
s:numberOfPages
10
n5:doi
10.2478/agri-2014-0006