Response of Pearl millet (Pennisetum glaucum L.) cultivars under different growing environments using DSSAT-model
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Date
2020-02
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CCSHAU, Hisar
Abstract
The field experiment entitled “Response of Pearl millet (Pennisetum glaucum L.) cultivars under different growing environments using DSSAT-model” was conducted during Kharif season (2018) at research farm of Department of Agricultural Meteorology, CCS HAU, Hisar (29°10 N, 75°46 E and altitude 215.2 m). The experiment was comprised of three sowing dates main plot treatments namely (D1) -5th July, (D2) - 15th July and (D3) - 31st July; sub plot treatments comprising three different cultivars viz. (V1)- GHB 558, (V2)- HHB 67 Improved and (V3)- HHB 272. The experiment was laid out in split-plot design with four replications. Different agrometeorological indices viz. GDD was higher in D2 and HTU was higher in D3. PTU, RUE and TUE accumulation was significantly higher under first date of sowing at various phenophases in comparison to the other date of sowing. The first sowing date (D1- 5th July) resulted in better overall growth and produced higher grain yield as compared to second sowing date (D2- 15th July) and third sowing date (D3-31st July). While among varieties, GHB 558 produced highest grain yield with better yield attributes as compared to HHB 67 Improved and HHB 272. In respect of phenological observations, agrometeorological indices and growth parameters shows better efficiency 5th July sown crop with variety GHB 558 among different sowing dates and varieties. IPAR was more in D3 as compared to other treatments. Grain yield was positively correlated with minimum temperature and rainfall. The radiation use efficiency (RUE) was higher in D1 treatment and variety GHB 558. DSSAT model was calibrated for (2018) and derived their genetic coefficients and further used for yield prediction. The results revealed that comparison of observed and simulated days to anthesis and physiological maturity were in good agreement with observed values of growth and yield attributes for Hisar conditions. The model over estimated both days to anthesis and physiological maturity in all the treatments. The simulated grain yield was over estimated and model simulation for maximum LAI was under estimated. Simulation performance of the model was found satisfactory with reasonable agreement (±10).The model has proved to a suitable tool for predicting phenology, maximum LAI and grain yield of pearl millet crop