The Napier grass model was evaluated for the tropical climatic conditions o f Santa
Cruz, Bolivia. The experimental data that were used for model evaluation included
two different crop management strategies related to nitrogen fertilizer application
rates and cutting intervals.
In general, the model showed a fairly good prediction for aboveground biomass,
leaf and stem biomass and plant height. The model simulated the plant nitrogen
balance fairly well and showed a strong response o f leaf and stem nitrogen
concentrations to the applications o f nitrogen fertilizer following each cut.
The results from this evaluation study indicate that the CSM-CROPGRO-Napier
grass model has the potential for application as a research and technology transfer
tool for sustainable management o f Napier grass under tropical and subtropical
conditions. However, it will be necessary to continue to adjust the model to deal with
some o f the differences between annual crops and forage crops, including multiple