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Hyperspectral imagery as a supporting tool in precision irrigation of karst landscapes

Published online by Cambridge University Press:  01 June 2017

M. Zovko ,
U. Žibrat ,
M. Knapič ,
M. Bubalo ,
M. Romić  and
D. Romić
M. Zovko*
Affiliation:
University of Zagreb, Faculty of Agriculture, Zagreb, Croatia
U. Žibrat
Affiliation:
The Agricultural Institute of Slovenia, Ljubljana, Slovenia
M. Knapič
Affiliation:
The Agricultural Institute of Slovenia, Ljubljana, Slovenia
M. Bubalo
Affiliation:
University of Zagreb, Faculty of Agriculture, Zagreb, Croatia
M. Romić
Affiliation:
University of Zagreb, Faculty of Agriculture, Zagreb, Croatia
D. Romić
Affiliation:
University of Zagreb, Faculty of Agriculture, Zagreb, Croatia
*
†E-mail: mzovko@agr.hr
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Abstract

This research was carried out in an experimental vineyard grown in artificially transformed karst terrain (Croatia). The experimental design included four water treatments in three replicates: 1) fully watered or based on 100% evapotranspiration (ETc) application; 2) regulated deficit irrigation based on 75% and 50% ETc applications; and 3) non-watered. Hyperspectral images of grapevines were taken in the summer of 2016 using two spectral-radiance (W·sr−1·m−2) calibrated cameras, covering wavelengths from 409 to 988 nm and 950 to 2509 nm. The four treatments were grouped into two new sets: 1) drought (NO); and 2) watered (the remaining three treatments). The watered group was then split into two new sets: 1) 50% treatment; and 2) 75+100% treatment. The images were analyzed using Partial least squares – discriminant analysis (PLS-DA), and Single Vector Machines (SVM). The PLS-DA demonstrated the capability to determine levels of grapevine drought or watered groups with 70 - 80% accuracy. A similar success rate was achieved in distinguishing the 50% group from the 75+100% group.

Keywords

vineyardirrigationwater stresshyperspectral imagerysoil
Type
Precision Irrigation
Information
Advances in Animal Biosciences , Volume 8 , Special Issue 2: Papers presented at the 11th European Conference on Precision Agriculture (ECPA 2017), John McIntyre Centre, Edinburgh, UK, July 16–20 2017 , July 2017 , pp. 578 - 582
Copyright
© The Animal Consortium 2017 

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