Parameterization and evaluation of the DSSAT/Canegro model for Brazilian sugarcane varieties

Abstract

The objective of this work was to parameterize and to evaluate the DSSAT/Canegro model for five Brazilian sugarcane varieties. The parameterization was done using biometric and growth data from the varieties CTC 4, CTC 7, CTC 20, RB 86‑7515, and RB 83‑5486, obtained in five Brazilian locations. Local sensitivity analysis was performed for the main parameters. Model parameterization was done using the generalized likelihood uncertainty estimation (Glue) method. The predictions were evaluated using the coefficient of determination (R²), Willmott’s D‑index, and the root mean square error (RMSE) as statistical indexes. CTC varieties showed D values ranging from 0.870 to 0.944 for leaf area index, stalk height, tillering, and sucrose content. The RB 83‑5486 variety showed similar results for sucrose content and fresh matter mass of stalks, whereas the RB 86‑7515 variety showed values ranging from 0.665 to 0.873 for all variables analyzed.