Possibilities of cereal canopy assessment by using the NDVI

J. Křen; V. Lukas; I. Svobodová; T. Dryšlová; P. Míša; L. Neudert

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Possibilities of cereal canopy assessment by using the NDVI

in Precision agriculture '09

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J. Křen

J. Křen
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V. Lukas

V. Lukas
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I. Svobodová

I. Svobodová
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T. Dryšlová

T. Dryšlová
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P. Míša

P. Míša
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L. Neudert

L. Neudert
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Art:: Kapitel

Seiten:: 151–158

DOI:: https://doi.org/10.1163/9789086866649_019

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Abstract

The evaluation of canopy structure development of winter wheat (Triticum aestivum L.) and spring barley (Hordeum vulgare L.), and its spectral characteristics by means of the Normalised Difference Vegetation Index (NDVI) was performed in small-plot field experiments carried out at two locations within three years (2005-2007). Statistically significant effects of year, location, experimental treatment (i.e. a combination of seeding rate and nitrogen dose), and growth stage on values of NDVI were confirmed. Correlation analysis demonstrated that increased NDVI values indicated: a greater amount of biomass and its dry matter, above all in the period of stem elongation; a higher weight of plants, number of tillers per plant, and a number of plants per stand unit area in the period of tillering; a higher average weight of tillers and number of tillers per stand unit area at the beginning of stem elongation; a more intensive green colour of the stand, indicating higher supply of nitrogen. Correlations between coefficients of variation for the weight of plants and tillers and values of NDVI were negative till the full canopy closure (usually till BBCH 31). In this period, the assessment of NDVI can be used for the evaluation of quality of stand establishment (i.e. of uniform distribution of individual plants). Identical values of NDVI may indicate either a greater amount of above-ground biomass with a deficit of nitrogen or a lower amount of tops in a good nutritional status. When using NDVI values, it is also rather difficult to decide if the given amount of above-ground biomass consists of a greater number of less tillering plants or, on the contrary, of a smaller number of plants with more tillers. Nevertheless, NDVI can be use for the evaluation of heterogeneity of cereal stands in precision agriculture.

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Precision agriculture '09

ISBN:: 9789086866649

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 01 Jan 2009

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- Biowissenschaften
  - Allgemein
  - Landwirtschaft und Umwelt

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Possibilities of cereal canopy assessment by using the NDVI

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Precision agriculture '09

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