TY - GEN
T1 - Use of remote sensing to generate crop coefficient and estimate actual crop evapotranspiration
AU - Reyes-Gonzalez, Arturo
AU - Hay, Christopher
AU - Kjaersgaard, Jeppe
AU - Neale, Christopher
N1 - Publisher Copyright:
Copyright © (2015) by the American Society of Agricultural & Biological Engineers All rights reserved.
PY - 2015
Y1 - 2015
N2 - Irrigation water is limited in many regions of the world. Accurate estimation of crop water requirements allows proper irrigation management and water conservation. A method used for estimating crop water requirement is the use of reference evapotranspiration (ETo) and crop coefficient (Kc). The objectives of this study were to generate Kc and estimate actual evapotranspiration (ETc) in forage crops using remote sensing in Northern Mexico. Monthly clear sky imagery from Landsat 5 (path/row 30/42) from March to November 2011 were used. The Normalized Difference Vegetation Index (NDVI) was calculated from reflectance of the red and near infrared bands. The relationship between NDVI derived from satellite images and Kc from literature was established. This relationship was used to create new Kc values for corn and alfalfa using additional overpass dates. The actual ET was estimated using new regional Kc and reference ET, which was estimated utilizing meteorological information from local agro-climatic stations. Results showed high coefficient of determination (r2) (0.97) between NDVI and Kc FAO-56, this relationship helped to generate new Kc curves for forage crops. The output of Kc values were multiplied by reference ET to estimate actual ET. The estimated crop water consumption on actual ET were 476 mm ha-1 for corn and 945 for alfalfa, saving 25 and 32% of irrigation water respectively. Remote sensing was a useful tool for generating local Kc and estimate accuracy of actual ET. Using this technology we can improve water management and conserve irrigation water.
AB - Irrigation water is limited in many regions of the world. Accurate estimation of crop water requirements allows proper irrigation management and water conservation. A method used for estimating crop water requirement is the use of reference evapotranspiration (ETo) and crop coefficient (Kc). The objectives of this study were to generate Kc and estimate actual evapotranspiration (ETc) in forage crops using remote sensing in Northern Mexico. Monthly clear sky imagery from Landsat 5 (path/row 30/42) from March to November 2011 were used. The Normalized Difference Vegetation Index (NDVI) was calculated from reflectance of the red and near infrared bands. The relationship between NDVI derived from satellite images and Kc from literature was established. This relationship was used to create new Kc values for corn and alfalfa using additional overpass dates. The actual ET was estimated using new regional Kc and reference ET, which was estimated utilizing meteorological information from local agro-climatic stations. Results showed high coefficient of determination (r2) (0.97) between NDVI and Kc FAO-56, this relationship helped to generate new Kc curves for forage crops. The output of Kc values were multiplied by reference ET to estimate actual ET. The estimated crop water consumption on actual ET were 476 mm ha-1 for corn and 945 for alfalfa, saving 25 and 32% of irrigation water respectively. Remote sensing was a useful tool for generating local Kc and estimate accuracy of actual ET. Using this technology we can improve water management and conserve irrigation water.
KW - Crop coefficient
KW - Crop water requirements
KW - Evapotranspiration
KW - Remote sensing
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M3 - Conference contribution
AN - SCOPUS:84951820534
T3 - American Society of Agricultural and Biological Engineers Annual International Meeting 2015
SP - 4374
EP - 4385
BT - American Society of Agricultural and Biological Engineers Annual International Meeting 2015
PB - American Society of Agricultural and Biological Engineers
T2 - American Society of Agricultural and Biological Engineers Annual International Meeting 2015
Y2 - 26 July 2015 through 29 July 2015
ER -