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Water quality protection by spectral determination of precise doses of fertilizers on arable land

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12220%2F19%3A43900655" target="_blank" >RIV/60076658:12220/19:43900655 - isvavai.cz</a>

  • Alternative codes found

    RIV/00027049:_____/19:N0000074

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Water quality protection by spectral determination of precise doses of fertilizers on arable land

  • Original language description

    The outflow of inorganic fertilizers from arable land is one of the main sources of surface water pollution. The pollution can be reduced by precise dosing of inorganic fertilizers according to the momentary nutrition need of the cultivated crops. The exact dose of fertilizer can vary considerably from one area to another as the soil conditions can be very variable even in the scope of a single field. The spectral properties of cultivated crops can be used for the calculation of precise doses of fertilizer. In our work we aimed to define the relation between the necessary nitrogen nutrition and the spectral properties of the winter wheat. As a rate of the actual crop nutrition the laboratory analysis of the plants was used to compute the Nitrogen Nutrition Index (NNI). An ensemble of the spectral measurements was used to compute the Red Edge Inflection Point index (REIP) to establish a relation between NNI and REIP indices. For the comparison of results from various technologies we employed the three different devices for spectral measurements (ground spectroradiometer, aerial hyperspectral sensor and satellite multispectral sensor). The results showed a close relation between laboratory-determined values of the crop NNI index and the REIP spectral index for all three measurement methods. Moreover, all three methods showed comparable and consistent results. Ground spectroradiometer measurement showed the closest relation between NNI and REIP indices (R2 = 0.9). Unlike a ground spectroradiometer, the aerial hyperspectral and the satellite multispectral measurements provide also a spatial distribution of the REIP values, so the spatial distribution of NNI values could be established using the previously computed relation. While hyperspectral measurements showed better spatial resolution (5 m per pixel) maintaining relatively good correlation (R2 = 0.82), multispectral measurements with lower spatial resolution (20 m per pixel) showed even a slightly better correlation R2 = 0.84). Unlike an aerial hyperspectral data, the satellite data are available for free and the scanning frequency is relatively high (2 to 3 datasets a week), so the technology can be used for precise fertilization purposes at low costs. In general, the work shows that the new technologies of spectral evaluation of crops nutrition can reduce the consumption of fertilizer by its precise dosing, so they can be also an effective tool in surface water quality protection.

  • Czech name

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

  • OECD FORD branch

    10501 - Hydrology

Result continuities

  • Project

    <a href="/en/project/TH02030133" target="_blank" >TH02030133: Agriculture management system integrating efficient nutrients utilization by crops and water conservation against non-point source pollution</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2019

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Article name in the collection

    19th International multidisciplinary scientific geoconference SGEM 2019 - conference proceedings

  • ISBN

    978-619-7408-97-3

  • ISSN

    1314-2704

  • e-ISSN

  • Number of pages

    8

  • Pages from-to

    317-324

  • Publisher name

    SGEM Scientific eLibrary

  • Place of publication

    Albena, Bulgaria

  • Event location

    Albena, Bulgaria

  • Event date

    Jun 28, 2019

  • Type of event by nationality

    EUR - Evropská akce

  • UT code for WoS article