Assessment in change of wheat growth and yield parameters through DSSAT crop model under different growing environment

The field experiment was conducted at research farm of Department of Agricultural Meteorology, Chaudhary Charan Singh Haryana Agricultural University, Hisar (long.750 46 / E, lat. 290 10 / N and alti. 215.2 meters MSL) during rabi seasons of 2015-16 and 2016-17. The main plot treatments consist of three date of sowing, i.e. D1 - 2nd fortnight of November, D2 - 1st fortnight of December, D3 - 2nd fortnight of December and sub plot treatments consist of three varieties, i.e. V1 - WH 1105, V2 - DPW 621-50 and V3 - HD 2967. The twenty seven treatment combinations were tested in split plot design with three replications. Genetic coefficient for DSSATwheat model such as P1V, P1D, P5, G1, G2, G3 and PHINT were evaluated. The model validation was carried out for wheat growth and yield attributes to test the model applicability under variable thermal environments of Haryana. The simulated results matched within the acceptable limit when compared with field experiments data. Validation was carried out for wheat by using multiyear data of the crop seasons 2015- 16 and 2016-17 consisting of four date of sowing and three varieties at different critical stages of crop growth. The phenology, growth and yield were comparable with the observed data. Grain yield (40.7 kg ha-1), straw yield (76.7 kg ha-1) and harvest index (0.34%) were satisfactorily simulated by the DSSAT wheat model both under optimal and sub optimal conditions under varying environmental conditions. This clearly showed the robustness of the DSSAT- wheat model.