Journal
AGRICULTURAL WATER MANAGEMENT
Volume 98, Issue 1, Pages 45-54Publisher
ELSEVIER
DOI: 10.1016/j.agwat.2010.07.011
Keywords
Evipotranspiration of grapes; Vegetation indices; Remote sensing; Canopy reflectance; Crop coefficients
Categories
Funding
- Ministerio de Ciencia e Innovacion (MICINN Spain)
- European Communities [GOCE 037095]
- Utah Agricultural Experiment Station
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A combined methodology of basal crop coefficient (K-cb) derived from vegetation indices (VI) obtained from satellite images and a daily soil water balance in the root zone of the crop was proposed to accurately estimate the daily grape crop coefficient and actual evapotranspiration The modeled values were compared with field measurements of crop evapotranspiration (ET) using an energy balance eddy-covariance flux tower and adjusted for closure using the measured Bowen ratio A linear relation between K-cb and VI for vineyard was obtained K-cb = 1 44 x NDVI-0 10 and K-cb = 1 79 x SAVI-0 08 The correlation of the measured crop coefficient (K-c) and modeled (K-crf) exhibits a linear tendency K-c, = 0 96K(crf) r(2) = 0 67 Other derived parameters such as weekly K. and daily and weekly ET show good consistency with measurements and higher coefficients of determination The study of the soil water balance suggests the importance of soil water storage in grapes within the La Mancha region These results validate the use of remote sensing as a tool for the estimation of evapotranspiration of irrigated wine grapes planted on trellis systems (c) 2010 Elsevier BV All rights reserved
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