| Autor: |
Jana Galambošová, Miroslav Macák, Katarina Olsovska, Marek Živčák, V. Rataj, Pavol Slamka |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Advanced Materials Research. 1059:127-133 |
| ISSN: |
1662-8985 |
| DOI: |
10.4028/www.scientific.net/amr.1059.127 |
| Popis: |
Technical and technological aspects of variable rate nitrogen fertilization receive much attention nowadays. Current commercial technology is based on the use of spectral reflectance of crop. However, these have some limitations as variety dependence, crop health effect and limited use in more developed growth stages. New parameters overcoming these problems need to be assessed and their potential in precision agriculture should be considered. Multispectrally induced fluorescence is a progressive method. In addition to chlorophyll content, it allows to determine phenolic compounds, which is a product of metabolism of the plant under nitrogen deficit and is considered as the most exact indicator of nitrogen deficit. Comparing the spectral reflectance indices (normalized difference vegetation index – NDVI and normalized difference red edge index – NDRE) and multispectral fluorescence index (nitrogen balance index – NBI), these performed similarly in terms of determining the leaves biomass and nitrogen content in %, NDRE and NBI reflected significantly also aboveground N; however, only the correlation of NDVI reflected with N uptake and with leaf area was highly significant. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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