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| import json | |
| def calcul_metriques_sol(clay, silt, sand, soc): | |
| """ | |
| Calcule le point de flétrissement (WP), l'humidité actuelle du sol (SM) et la capacité au champ (FC). | |
| :param clay: Pourcentage d'argil dans le sol (%) | |
| :param silt: Pourcentage de silt dans le sol (%) | |
| :param sand: Pourcentage de sand dans le sol (%) | |
| :param soc: Carbone organique du sol (%) | |
| :return: WP, SM et FC (%) | |
| """ | |
| # Calcul de la capacité au champ (FC) | |
| FC = 0.2576 * silt + 0.2484 * clay + 0.3664 * soc + 20.83 | |
| # Calcul du point de flétrissement (WP) | |
| WP = 0.026 * clay + 0.5 * soc + 3.0 | |
| # Calcul de l'humidité actuelle du sol (SM) comme 50% de la plage entre FC et WP | |
| SM = WP + 0.5 * (FC - WP) | |
| # Retourne les résultats sous forme de dictionnaire | |
| return round(SM, 2), round(FC, 2), round(WP, 2) | |
| def calculate_ETx(Kc, ETo): | |
| """ | |
| Calculate the maximum evapotranspiration (ETx) using the crop coefficient (Kc) and reference evapotranspiration (ETo). | |
| Parameters: | |
| Kc (float): Crop coefficient | |
| ETo (float): Reference evapotranspiration (mm) | |
| Returns: | |
| float: Maximum evapotranspiration (ETx) in mm | |
| """ | |
| ETx = Kc * ETo | |
| return ETx | |
| def calculate_ETa(ETx, soil_moisture, field_capacity, wilting_point): | |
| """ | |
| Calculate the actual evapotranspiration (ETa) using the maximum evapotranspiration (ETx), soil moisture, field capacity, and wilting point. | |
| Parameters: | |
| ETx (float): Maximum evapotranspiration (mm) | |
| soil_moisture (float): Current soil moisture content (%) | |
| field_capacity (float): Field capacity of the soil (%) | |
| wilting_point (float): Wilting point of the soil (%) | |
| Returns: | |
| float: Actual evapotranspiration (ETa) in mm | |
| """ | |
| if soil_moisture > field_capacity: | |
| ETa = ETx | |
| elif soil_moisture < wilting_point: | |
| ETa = 0 | |
| else: | |
| ETa = ETx * ((soil_moisture - wilting_point) / (field_capacity - wilting_point)) | |
| return ETa | |
| def calculate_yield_projection(Yx, ETx, ETa, Ky): | |
| """ | |
| Calculate the agricultural yield projection using the FAO water production function. | |
| Parameters: | |
| Yx (float): Maximum yield (quintal/ha) | |
| ETx (float): Maximum evapotranspiration (mm) | |
| ETa (float): Actual evapotranspiration (mm) | |
| Ky (float): Yield response factor | |
| Returns: | |
| float: Projected yield (quintal/ha) | |
| """ | |
| Ya = Yx * (1 - Ky * (1 - ETa / ETx)) | |
| return round(Ya, 2) | |
| if __name__ =="__main__": | |
| # Exemple d'utilisation | |
| Yx = 10000 # Rendement maximum en quintal/ha | |
| Kc = 1.2 # Coefficient de culture | |
| Ky = 1.25 # Facteur de réponse du rendement pour le maïs | |
| soil_moisture, field_capacity, wilting_point = calcul_metriques_sol(clay=20, silt=40, sand=40, soc=1.5) | |
| ETo = 5.0 # Evapotranspiration de référence en mm/jour | |
| ETx = calculate_ETx(Kc, ETo) | |
| ETa = calculate_ETa(ETx, soil_moisture, field_capacity, wilting_point) | |
| projected_yield = calculate_yield_projection(Yx, ETx, ETa, Ky) | |
| print(f"Le rendement projeté est de {projected_yield} quintal/ha") |