Evaluation of a simple approach for crop evapotranspiration partitioning and analysis of the water budget distribution for several crop species

•Use simple method for partitioning evapotranspiration of agro-ecosystems.•Partition evapotranspiration measured by eddy covariance into soil and vegetation contribution.•Evaluation of the performances of original marginal distribution sampling method.•Results comparison with a SVAT model.•Analysis of the water budget of different agro-ecosystems at different time scales.