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فهرست مطالب نویسنده:

b. kumar

  • H. Bisht, Shaloo, B. Kumar*, D. K. Singh, A. K. Mishra

    This study was conducted to examine the sensitivity of weather parameters and CO2 concentration to wheat production under two irrigation regimes viz. full irrigation and limited irrigation, using CERES-Wheat model. Field experiment data from the 2016-17 and 2017-18 rabi seasons on wheat cultivar HD-2967 with three sowing dates and five irrigation regimes were used to calibrate and validate the CERES-Wheat crop simulation model. Validation results indicated very good agreement between simulated and observed values under five, four, and three irrigations regimes as compared to lower irrigation regimes. Under full irrigation and limited irrigation, grain yield sensitivity to incremental unit of mean temperature from 1 to 3°C revealed a decrease of 6 to 22% and 8 to 16%, respectively. Temperature decreases of 1-3°C resulted in a gradual increase in yield of 10-28 and 6.5- 20%, respectively, under full and limited irrigation. The combined effect of higher mean temperature and lower solar radiation revealed that wheat yield was more sensitive to temperature than solar radiation. Furthermore, the combined effect of mean temperature and CO2 level revealed that higher levels of CO2 concentration yielded the greatest benefits with a 1 °C increase in temperature, but further increases in temperature reduced the beneficial effect of elevated CO2 level under both irrigation conditions.

    Keywords: CO2 concentration, DSSAT, Food security, Solar radiation, Temperature effects
  • Priyanka Prasad, Ram Kishor, Akancha Gupta, Vidhi Saxena, Sameen Zaidi, Himanshu Kushwaha, Vagmi Singh, Ram Swaroop Verma, B. Kumar *
    Menthol rich with low menthofuran peppermint (Mentha piperita L.) genotype MPK-5 and their eight half-sib seed progenies were evaluated for different genetic parameters, namely coefficient of variation, genetic advance, heritability, associations, and path analysis for different economic characters, viz., plant height, leaf length, leaf width, leaf: stem ratio, herb yield, essential oil content (%), and contents of various essential oil constituents (quality traits) such as sabinene, myrcene, limonene, α-pinene, β-pinene, 1,8-cineole, menthone, menthofuran, neo-menthol, isomenthone, menthyl acetate, menthol, and pulegone. The phenotypic coefficient of variations (PCV) was found slightly higher than the genotypic coefficient of variations (GCV) for the characters studied, indicating that the apparent variation was not only due to genetic but also influenced by the growing environment for the expression of studied traits. The highest genotypic coefficients of variation (GCV) was noted for the character pulegone, followed by menthofuran and 1,8-cineole. High heritability coupled with high genetic advance was observed for menthol followed by pulegone demonstrating that these chemical compositions might be under non-additive genetic control. The genotypic correlations were higher than the phenotypic correlations for studied traits. The significant and positive associations of β-pinene with sabinene and 1,8-cineole; α-pinene with β-pinene, sabinene, and 1,8-cineole; menthyl acetate with neo-menthol; and sabinene with 1,8-cineole were noted. A high direct positive effect was also recorded between menthofuran and limonene.
    Keywords: Mentha piperita L, Genetic advance, Genetic improvement, Genotypic coefficient of variation, Phenotypic coefficient of variation, phenotypic correlation, selection
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