MODELING GROWTH AND YIELD OF CHICKPEA (CICER ARIETINUM L.) uri icon

abstract

  • Achickpea growth and development model (CHIKPGRO) was developed from the hedgerow-version of the groundnut model PNUTGRO. Changes were made in various subroutines determining vegetative and reproductive development, crop growth and partitioning of assimilates to component plant organs to simulate chickpea crop growth under water-limiting and non-limiting situations. Using the experimental data of the 1984 and 1986 seasons, the model was calibrated for cultivar-specific parameters of cv. Annigeri and JG 74 and also for soil parameters determining water balance of the root-zone. The model was validated against data from the 1985, 1987, 1992 and 1993 seasons. The model predicted flowering, pod initiation, beginning of seed growth and physiological maturity within 5 days of the observed values,except under extreme wet situations when the actual seed growth and physiological maturity of chickpea occurred later than the simulated dates. LAI, total DM production (TDM) and its partitioning to various plant organs under irrigated and water-stressed conditions were also predicted satisfactorily by the model. Soil moisture changes in the rooting-zone of chickpea were also predicted accurately. Predicted TDM and seed yields of Annigeri and JG 74 at harvest were significantly correlated with the observed data (r=0.89 and RMSE=0.34 t/ha for TDM; r=0.82 and RMSE=0.14 t/ha for seed). It was concluded that CHIKPGRO can be used to predict potential and water-limited yields of chickpea in the Indian plateau

publication date

  • 1996
  • 1996