ISHS Acta Horticulturae 792: V International Symposium on Irrigation of Horticultural Crops
DEVELOPMENT OF A REAL-TIME SPATIAL ASSESSMENT TOOL FOR GRAPEVINE CANOPY VIGOUR AND WATER STRESS |
| Authors: | J.W. Hornbuckle, E.W. Christen, R. Zandona, I. Goodwin |
| Keywords: | NDVI, CWSI, ATV, remote sensing |
| Abstract:
Knowledge of spatial variability in vineyards is increasingly being incorporated into harvest, fertiliser and pest/disease management decisions. To improve irrigation efficiency and productivity, vineyard managers should also consider the spatial variability in vine water use and water stress. A portable system capable of assessing real-time spatial variability in canopy vigour and water stress was developed and tested in a commercial vineyard. The system consisted of two sensing platforms – normalised difference vegetation index (NDVI) and infra-red (IR) temperature. Both sensors were logged to a military grade portable Windows consumer electronic (CE) device at > 5 Hz frequencies using the RS 232 serial protocol. Differential global positioning system (GPS) data was simultaneously collected by the system. Crop Water Stress Index (CWSI) was calculated from foliage IR temperature and air temperature. CWSI and NDVI maps were constructed from the data. This paper describes preliminary results of the development and construction of the system and initial results from field testing. The developed system provides a spatial capability for measuring canopy and stress indexes which was previously lacking in other ground-based systems. It also provides a lower cost and lower complexity system compared to airborne systems, and near real-time capabilities that are expensive to obtain with satellite-based systems. | |
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