Sensitivity of CERES-Rice model to different environmental parameters on the productivity of aromatic rice in middle Gujarat

Abstract

The present investigation was carried out during kharif season of 2007 and 2008 to develop genetic coefficients of four different genotypes of aromatic rice (cv. Pankhali, Narmada, GR-104 and Pusa Basmati-1) transplanted on three different dates viz., D1 (8th July), D2 (22nd July) and D3 (8th August). The sensitivity analysis of CERES-Rice model with respect to different scenarios of duration of photoperiods, solar radiation, CO2 concentration, maximum and minimum temperatures were carried out. The simulated grain yield increased linearly with incremental unit increase in day length, solar radiation, reduction of maximum temperature and vice versa. Simulated grain yields increased up to 27.9% under elevated scenarios of CO2 from 380 to 410 ppm by the model. Large yield reductions were observed on decreasing plant population. However, model did not show any significant change due to increase in the plant population. The model was found enough sensitive to account for the effects of transplant age of seedlings on simulated grain yield in comparison with the base yield.

Keywords

• CERES-Rice
• genetic coefficient
• aromatic rice genotypes
• transplanting dates
• sensitivity analysis