@article{fdi:010079930,
  title = {{A} simple light-use-efficiency model to estimate wheat yield in the semi-arid areas},
  author = {{K}habba, {S}. and {E}r-{R}aki, {S}. and {T}oumi, {J}. and {E}zzahar, {J}. and {H}ssaine, {B}. {A}. and {L}e {P}age, {M}ichel and {C}hehbouni, {A}bdelghani},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n this study, a simple model, based on a light-use-efficiency model, was developed in order to estimate growth and yield of the irrigated winter wheat under semi-arid conditions. {T}he originality of the proposed method consists in (1) the modifying of the expression of the conversion coefficient (epsilon(conv)) by integrating an appropriate stress threshold (k(sconv)) for triggering irrigation, (2) the substitution of the product of the two maximum coefficients of interception (epsilon(imax)) and conversion (epsilon(conv_max)) by a single parameter epsilon(max), (3) the modeling of epsilon(max) as a function of the {C}umulative {G}rowing {D}egree {D}ays ({CGDD}) since sowing date, and (4) the dynamic expression of the harvest index ({HI}) as a function of the {CGDD} and the final harvest index ({HI}0) depending on the maximum value of the {N}ormalized {D}ifference {V}egetation {I}ndex ({NDVI}). {T}he calibration and validation of the proposed model were performed based on the observations of wheat dry matter ({DM}) and grain yield ({GY}) which were collected on the {R}3 irrigated district of the {H}aouz plain (center of {M}orocco), during three agricultural seasons. {F}urther, the outputs of the simple model were also evaluated against the {A}qua{C}rop model estimates. {T}he model calibration allowed the parameterization of epsilon(max) in four periods according to the wheat phenological stages. {B}y contrast, a linear evolution was sufficient to represent the relationship between {HI} and {CGDD}. {F}or the model validation, the obtained results showed a good agreement between the estimated and observed values with a {R}oot {M}ean {S}quare {E}rror ({RMSE}) of about 1.07 and 0.57 t/ha for {DM} and {GY}, respectively. {T}hese correspond to a relative {RMSE} of about 19% for {DM} and 20% for {GY}. {L}ikewise, although of its simplicity, the accuracy of the proposed model seems to be comparable to that of the {A}qua{C}rop model. {F}or {GY}, {R}-2, and {RMSE} values were respectively 0.71 and 0.44 t/ha for the developed approach and 0.88 and 0.37 t/ha for {A}qua{C}rop. {T}hus, the proposed simple light-use-efficiency model can be considered as a useful tool to correctly reproduce {DM} and {GY} values.},
  keywords = {wheat ; dry matter ; grain yield ; simple model ; cumulative growing degree ; days ; normalized difference vegetation index ; {MAROC} ; {ZONE} {MEDITERRANEENNE}},
  booktitle = {},
  journal = {{A}gronomy},
  volume = {10},
  numero = {10},
  pages = {1524 [23 p.]},
  year = {2020},
  DOI = {10.3390/agronomy10101524},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079930},
}