@article{fdi:010064795,
  title = {{I}mpact of sowing date on yield and water use efficiency of wheat analyzed through spatial modeling and {FORMOSAT}-2 images},
  author = {{D}uchemin, {B}eno{\^i}t and {F}ieuzal, {R}. and {R}ivera, {M}. {A}. and {E}zzahar, {J}. and {J}arlan, {L}ionel and {R}odriguez, {J}. {C}. and {H}agolle, {O}. and {W}atts, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}egional analysis of water use efficiency ({WUE}) is a relevant method for diagnosing the performance of irrigation systems in water-limited environments. {I}n this study, we investigated the potential of {FORMOSAT}-2 images to provide spatial estimates of {WUE} over irrigated wheat crops cultivated within the semi-arid {Y}aqui {V}alley, in the northwest of {M}exico. {FORMOSAT}-2 provided us with a unique dataset of 36 images at a high resolution (8 m) encompassing the wheat growing season from {N}ovember 2007 to {M}ay 2008. {T}ime series of green leaf area index were derived from these satellite images and used to calibrate a simple crop/water balance model. {T}he method was applied over an 8 x 8 km(2) irrigated area on up to 530 wheat fields. {I}t allowed us to accurately reproduce the time courses of {L}eaf {A}rea {I}ndex and dry aboveground biomass, as well as evapotranspiration and soil moisture. {I}n a second step, we analyzed the variations of {WUE} as the ratio of accumulated dry aboveground biomass to seasonal evapotranspiration. {D}espite the study area being rather small and homogeneous (soil, climate), we observed a large range in wheat biomass production, from 5 to 15 t center dot ha(-1), which was primarily related to the timing of plant emergence. {I}n contrast, the seasonal evapotranspiration only varied from 350 to 450 mm, with no evident link with sowing practices. {A} significant gain in crop water productivity was found for the fields sown the earliest (maximal {WUE} around 3.5 kg center dot m(-3)) compared to those sown the latest (minimal {WUE} around 1.5 kg center dot m(-3)). {T}hese results demonstrated the value of the {FORMOSAT}-2 images to provide spatial estimates of crop production and water consumption. {T}he detailed information provided by such high space and time resolution imaging systems is highly valuable to identify agricultural practices that could enlarge crop water productivity.},
  keywords = {{MEXIQUE}},
  booktitle = {},
  journal = {{R}emote {S}ensing},
  volume = {7},
  numero = {5},
  pages = {5951--5979},
  ISSN = {2072-4292},
  year = {2015},
  DOI = {10.3390/rs70505951},
  URL = {https://www.documentation.ird.fr/hor/fdi:010064795},
}