Spatial Variability of NDVI and SPAD for Variable- and Fixed-Rate Fertilization in Olive Orchards

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dc.authorscopusid57886024000
dc.authorscopusid24802287900
dc.contributor.authorAtik, Murtaza
dc.contributor.authorAkdemir, Bahattin
dc.date.accessioned2023-04-20T08:02:25Z
dc.date.available2023-04-20T08:02:25Z
dc.date.issued2022
dc.departmentFakülteler, Ziraat Fakültesi, Tarla Bitkileri Bölümü
dc.departmentFakülteler, Ziraat Fakültesi, Biyosistem Mühendisliği Bölümü
dc.description.abstractThe aim of this study was to determine the spatial variability of fertilization requirements by using normalized difference vegetation index (NDVI) and soil plant analysis development (SPAD) data for olive orchards. The research was carried out in Ayvalik, Turkey. The olive orchard was divided into two parts to measure NDVI and SPAD for variable-rate fertilization and fixed-rate fertilization. The NDVI was measured with a GreenSeeker sensor and SPAD readings were made with a SpadMeter. Geographic coordinates of the NDVI and SPAD measurements were also determined by a global navigation satellite system (GNSS). After applying these fertilization methods, NDVI and SPAD measurements were recorded. Soil and leaf samples were analysed in the laboratory to determine the content of plant nutrients for nitrogen (N), phosphorous (P) and potassium (K). Spatial variability maps were created for NDVI and SPAD values. According to the statistical analyses, NDVI values varied between 0.577 and 0.838 and the coefficient of variation (CV) was calculated as 6.45% for all measurements. The average NDVI was determined as 0.739 and the CV was 7.04% for fixed-rate fertilization and 0.734 and 5.87% for variable-rate fertilization. Differences between NDVI measurements for fixed-rate fertilization and variable-rate fertilization were not statistically significant according to t-test results (t = 0.524, p > 0.05). The NDVI measurements were made around trees and the GreenSeeker sensor measured NDVIs from a mixture of leaves, branches and air for each olive tree; this situation affected the NDVI measurements. In addition, the colour, shape and content of the olive leaf also affected the NDVI measurements.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK); TUBITAK [112O086]
dc.description.sponsorshipThis publication is a part of final report of the project funded by The Scientific and Technological Research Council of Turkey (TUBITAK). The authors would like to thank TUBITAK for supporting the project `Development fertiliser spreader with variable rate controllers for olive orchards-Project No. 112O086'.
dc.identifier.doi10.1007/s10341-022-00748-w
dc.identifier.issn0014-0309
dc.identifier.issn1439-0302
dc.identifier.scopus2-s2.0-85137824092
dc.identifier.scopusqualityQ3
dc.identifier.urihttps://doi.org/10.1007/s10341-022-00748-w
dc.identifier.urihttps://hdl.handle.net/20.500.11776/10910
dc.identifier.wosWOS:000852107200008
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorAtik, Murtaza
dc.institutionauthorAkdemir, Bahattin
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofErwerbs-Obstbau
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectOlea Europea L
dc.subjectNitrogen
dc.subjectChlorophyl
dc.subjectPlant Nutrients
dc.subjectFertilizer
dc.subjectSpectral Reflectance
dc.subjectNitrogen Status
dc.subjectWheat
dc.subjectIndex
dc.subjectAvhrr
dc.subjectRed
dc.titleSpatial Variability of NDVI and SPAD for Variable- and Fixed-Rate Fertilization in Olive Orchards
dc.typeArticle

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