In this study, a comparison of six vegetation indices derived from hyperspectral reflectance measurements is presented. The aim was to assess the suitability of the indices to detect agronomically relevant crop parameters in the course of a day. Irradiance and reflectance of winter wheat (Triticum aestivum L.) were recorded simultaneously with a portable device, equipped with two spectrometers, on a near-canopy scale in a field trial. Variations in reflection properties of the wheat canopies were induced by (i) growing wheat varieties differing in growth characteristics or leaf colour, and (ii) applying different nitrogen amounts. Biomass samples were taken to determine above-ground biomass yield, N concentration in biomass, and N uptake. The indices were compared by means of analysis of variance and multiple comparisons of means. In winter wheat, considerable differences between the indices were measurable. The red edge inflection point (REIP), and the infrared index (IRI) were least subjected to diurnal variations and simultaneously proved to be most sensitive to N rate. For the REIP, the infrared green index (IRG) and the IRI, no saturation effects were observed for a high N supply. These indices seem to be most advantageous to detect agronomically relevant crop parameters in winter wheat in the course of a day. A practicable concept is proposed for the application of vegetation indices as a tool to optimise N fertilisation.
Precision Agriculture – Springer Journals
Published: Dec 30, 2004
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera