Abstract
In recent years, within the European Union several legislative, monitoring and coordinating actions have been undertaken to encourage sustainable use of resources, reduction in the use of chemicals and improvement of the urban environment. In this respect, two concepts that are strictly related to most of the aspects above are: “precision agriculture” and “precision conservation” and more specifically “precision turfgrass management.” Optical sensing has become a crucial part of precision turfgrass management and spectral reflectance in particular has been an active area of research for many years. However, while turfgrass status evaluation by proximity-sensed spectral reflectance appears to be an established and reliable practice, much more could be achieved in terms of monitoring of large turfgrass areas through remote sensing, and in particular through satellite imagery. This paper reports the results of a trial attempting to evaluate the spectral signatures of several turfgrass species and cultivars, for future use in turfgrass satellite monitoring. Our experimental study focused on 20 turfgrass species/varieties including perennial ryegrasses, tall fescues, kentucky bluegrasses, bermudagrass ecotypes, seeded commercial bermudagrasses, vegetatively propagated bermudagrasses, Zoysia japonica and non-japonica zoysiagrasses. Various biological and agronomical parameters were studied and turfgrass spectral reflectance for all entries was gathered. Vegetation indices were calculated by simulating the available wavelengths deriving from World View 2 satellite imagery. Results showed that within the same species selected vegetation indices are often able to discriminate between different varieties that have been established and maintained with identical agronomical practices.
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Abbreviations
- PA:
-
Precision agriculture
- PC:
-
Precision conservation
- GPS:
-
Global positioning systems
- GIS:
-
Geographic information systems
- PTM:
-
Precision turfgrass management
- LAI:
-
Leaf area index
- NDVI:
-
Normalized difference vegetation index
- NIR:
-
Near infrared
- NPCI:
-
Normalized pigment chlorophyll index
- SIPI:
-
Structure intensive pigment index
- PRI:
-
Photochemical reflectance index
- GNDVI:
-
Green normalized difference vegetation index
- MCARI:
-
Modified chlorophyll absorption in reflectance index
- YI:
-
Yellowness index
- SR:
-
Simple ratio
- WI:
-
Water index
- RVI:
-
Ratio vegetation index
- WV2:
-
WorldView-2
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Caturegli, L., Lulli, F., Foschi, L. et al. Turfgrass spectral reflectance: simulating satellite monitoring of spectral signatures of main C3 and C4 species. Precision Agric 16, 297–310 (2015). https://doi.org/10.1007/s11119-014-9376-3
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DOI: https://doi.org/10.1007/s11119-014-9376-3