| Author's Name: |
Samiha Ouda, Mostafa Morsy, Tarek Sayad and Fathy El Hussieny |
| Subject Area: |
Life Sciences |
| Subject |
Agricultural |
| Section |
Research Paper |
Keyword:
Above ground biomass-transpiration coefficient; light to aboveground biomass conversion coefficient; Egyptian wheat cultivars; goodness of fit measurements; growing degree days.
Abstract
The absence of values for wheat cultivars parameters to calibrate CropSyst model can pose as an obstacle to simulate productivity. The objective of this study was to use CropSyst model to quantify a range for calibration parameters for four wheat cultivars grown in 9 growing seasons at 4 governorates in Egypt. Data was collected and used to prepare input data files. These data were: cultivar phenology and productivity at each governorate, as well as soil and weather data. Two parameters were calibrated, i.e. above ground biomass-transpiration (GP1) and light to aboveground biomass conversion (GP2). Goodness of fit test revealed that R2 and d values were close to 1. The values of MPE, RMSE, and MAE were close to zero, which implied that the calibration procedure was successful to reflect the effect of weather, soil and management on each cultivar and properly simulated productivity. The results also indicated that the range of GP1 value for the four cultivars were between 5.00-10.20 KPa kg/m3 and the range of GP2 values for these cultivars were between 3.00-8.20 g/MJ. Thus, the obtained set of crop parameters could allow reasonable estimation of productivity for various wheat cultivars at different locations and growing seasons.