Journal
AGRICULTURAL WATER MANAGEMENT
Volume 122, Issue -, Pages 12-19Publisher
ELSEVIER
DOI: 10.1016/j.agwat.2013.02.007
Keywords
Crop coefficient (K-c); Evapotranspiration; Normalized Difference Vegetation Index (NDVI); Eddy covariance; Vitis vinifera L.; cvs. Perlette and Superior
Categories
Funding
- PLEIADES Participatory multi-Level EO-assisted tools for Irrigation water management and Agricultural Decision-Support
- European Union (7th PCRD)
- Fundacion Produce Sonora Mexico
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The main goal of this research is to develop and to evaluate a relationship established between Normalized Difference Vegetation Index (NDVI) and crop coefficient (K-c) for estimating crop evapotranspiration (ETc) of table grapes vineyards (Vitis vinifera L., cvs. Perlette and Superior) in the semi-arid region of Northwest Mexico. Two consecutive growing seasons (2005 and 2006) of continuous measurements of ETc with the eddy covariance system were used to test the performance of the K-c-NDVI relationship. An exponential relation relating K-c to NDVI (R-2 = 0.63) is proposed and tested here as the basis for calculating ETc. The obtained results indicate that the K-c-NDVI approach estimates ETc reasonably well over two growing seasons. The root mean square error (RMSE) between measured and derived ETc from NDVI during 2005 and 2006 were respectively about 0.45 and 0.76 mm day(-1). Some discrepancies between measured and simulated ETc occurred when NDVI saturates at high values, causing the under-estimation of evapotranspiration. (c) 2013 Elsevier B.V. All rights reserved.
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