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Subject: Agricultural Meteorology × Author: Grover, Karanjot Singh × End date: 2018 × Start date: 2000 × Type: Thesis × Thesis Type: M.Sc ×
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    Effect of heat and moisture stress on wheat genotypes and possible mitigation strategies using the DSSAT-CSM-CERES-Wheat model
    (Punjab Agricultural University, Ludhiana, 2018) Grover, Karanjot Singh; Raj Kumar Pal
    The present study entitled “Effect of heat and moisture stress on wheat genotypes and possible mitigation strategies using the DSSAT-CSM-CERES-wheat model” was carried out at the two locations viz., Punjab Agricultural University (PAU) Regional Research Station, Bathinda, and Faridkot during the rabi season of the year 2016-17. The soil of both the experimental sites was sandy loam. The experiments were laid out with two wheat cultivars (PBW 725 and PBW 658), two sowing dates (21st November and 9th December) and 5 irrigation levels - I1 (recommended), I2 (skipped at CRI), I3 (skipped at flowering), I4 (skipped at dough stage) and I5(skipped at I2,I3 and I4 respectively) in strip-plot design with three replications. Crop growth, yield and yield attributing characters in terms of number of maximum tillers, effective tillers, LAI, grains spike-1, test weight, grain yield and biomass yield were recorded significantly higher under the normal sowing (21st November). The genotype PBW 725 performed better under normal sowing, while PBW 658 for late sowing at both the locations. The highest significant grain yield was recorded with crop sown on 21st November (3476 kg ha-1 and 3483 kg ha-1 at Bathinda and Faridkot respectively) than 9th December sown crop (3041 kg ha-1 and 2970 kg ha-1 at both the locations, respectively). The CERES-wheat model underestimated the days to attain emergence, grain yield and biomass, while overestimated in respect of anthesis and physiological maturity. Lesser variations were observed with recommended irrigation than rest of the irrigation levels at both the locations. About 0.5-14%, 3-22% and 5.7-33% reduction in grain yield were found with elevated mean temperature by 1, 2 and 3 °C respectively. However, yield was increased by 3-12%, 4-35% and 3-77% with decrease in mean temperature by 1, 2 and 3°C respectively. Among sowing windows, maximum grain yield was predicted on 11th November with the recommended irrigation at Bathinda, while, 40mm irrigation amount was found optimum for contributing maximum grain yield.