Accurately estimation of crop evapotranspiration (ETc), as a vital parameter of irrigation management, is very critical for maximizing the use of limited irrigation water resources. Due to the complexity of estimating the daily ETc precisely, models are quick, accurate and easy to use. Therefore, an interactive Irrigation Management model for growing Crops (IMC-Model) was developed with the purpose of computing daily ETc to provide appropriate information of irrigation water management. This paper is the first part of a two-part series, where the second one describes the IMC-Model validating on some oil crops under surface and sub-surface drip irrigation. The IMC-Model was structured using Visual Basic 2013 language. This model followed the ETo-Kc method for computing the daily ETc. The ETo was computed by Penman-Monteith equation. Additionally, the model followed the two Kc approaches (single-Kc and dual-Kc) in order to be appropriate for all users and agricultural conditions. The model was also verified by two ready-to-use programs (CropWat-8 and ETo Calculator-3.2) for estimating the ETo, in addition, a spreadsheet named (FAO56Ax8.xls) introduced in FAO-56 for computing the daily ETc. The obtained results showed that the ETo calculated using the IMC-Model gave a high agreement among the values obtained from CropWat-8.0 and ETo Calculator-3.2 programs. In addition, the estimation of daily ETc using the model gave a high correlation (R2 ≈ 0.99) with those obtained from the FAO-56 spreadsheet. Conclusion: It can concluded that the IMC-Model is a proper solution for precisely computing ETc and the other irrigation management parameters.
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