@article{fdi:010053376,
  title = {{D}erived crop coefficients for winter wheat using different reference evpotranspiration estimates methods},
  author = {{E}r-{R}aki, {S}. and {C}hehbouni, {A}bdelghani and {E}zzahar, {J}. and {K}habba, {S}. and {L}akhal, {E}.{K}. and {D}uchemin, {B}eno{\^i}t},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper reports the results of using three empirical methods ({M}akkink, {P}riestley-{T}aylor and {H}argreaves) for estimating the reference evapotranspiration ({ET}0) in the semi-arid region of {T}ensift {A}l {H}aouz, {M}arrakech (center of {M}orocco). {T}he {P}enman-{M}onteith equation, standardized by the {F}ood and {A}griculture {O}rganization ({FAO}-{PM}), is used to evaluate the three empirical methods. {T}he obtained {ET}0 data were used to estimate crop water requirement ({ET}) of winter wheat using the crop coefficient ({K}-c) approach and results were compared with {ET} measured by the {E}ddy {C}ovariance technique. {T}he result showed that using the original empirical coefficients a, alpha and {C}-m in {H}argreaves, {P}riestley-{T}aylor and {M}akkink equations, respectively, the {H}argreaves method agreed fairly well with {FAO}-{PM} method at the test site. {C}onversely, the {P}riestley-{T}aylor and {M}akkink methods underestimate the {ET} by about 20 and 18 %. {A}fter adjustment of the original values of two parameters alpha and {C}-m coefficients in {P}riestley-{T}aylor and {M}akkink equations, the underestimation of {ET} was reduced to 9% and 4% for the {P}riestley {T}aylor and {M}akkink methods, respectively, which led to an improvement of 55% and 76% of the obtained values compared with the original values.},
  keywords = {{C}rop water requirement ; {E}ddy covariance ; {E}mpirical method ; {S}emi-arid ; {E}nvironment ; {MAROC}},
  booktitle = {},
  journal = {{J}ournal of {A}gricultural {S}cience and {T}echnology},
  volume = {13},
  numero = {2},
  pages = {209--221},
  ISSN = {1680-7073},
  year = {2011},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053376},
}