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M. Sc. Dissertations

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20162
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Subject: Agricultural Meteorology × Start date: 2016 ×
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    ThesisItemOpen Access
    Growth and radiation use efficiency of Basmati rice (Oryza sativa L.) varieties under different transplanting environments
    (CCSHAU, 2016) Abhilash; Dagar, C.S.
    A field experiment was conducted during the kharif season of 2015 at Chaudhary Charan Singh Haryana Agricultural University, Rice Research Station, Kaul, India to study the comparative performance of different scented basmati rice cultivars under different dates of transplanting. The experiment included three dates of transplanting viz. 25 th June, 10 th July and 25 th July, respectively as main plot treatment and four cultivars namely CSR 30, Pusa Basmati 1121, Pusa Basmati 1509 and Haryana Basmati 2 as subplot treatment, resulting in 12 treatment combinations. The experiment was laid out in a split-plot design with four replications. Among different dates of transplanting the plant height and dry matter accumulation were significantly higher at all the growth stages when crop was transplanted on 25 th June as compared to the crop transplanted on 10 th July and 25 th July. Better results in terms of yield and yield attributes such as maximum number of effective tillers, more panicle length and panicle weight, more number of grains per panicle, less number of unfilled spiklets per panicle, higher 1000 grain weight, higher grain and straw yield, more harvest index, more grain length and breadth, L/B ratio and head rice recovery were observed in the early transplanted crop. Higher value of LAI, CGR, RGR and SLA were observed in the early transplanted crop. Maximum number of GDD, HTU and PTU were accumulated when crop was transplanted on 25 th June. Higher RUE and HUE were also observed in early transplanted crop. Among the varieties, CSR 30 consumed highest GDD, HTU and PTU as compared to HB 2, PB 1121 and PB 1509, respectively under different transplanting environments. The PAR utilization efficiency for grain production was highest in HB 2 at the time of harvest. The efficiency of heat utilization was also higher in HB 2 as compared to other varieties at the time of harvest. Panicle length, panicle weight, grains per panicle, 1000 grain weight, grain yield, straw yield, and harvest index were significantly higher than PB 1509 and CSR 30 but were statistically at par with PB 1121. LAI, CGR and SLA showed significantly positive correlation whereas, RGR was negatively correlated with yield and yield attributes. At physiological maturity all agrometeorological indices namely AGDD, AHTU, APTU, RUE and HUE were positively correlated with yield and yield attributes. Multiple regression equations developed for estimation of different yield and yield attributes using weather parameters shows that maximum temperature, sunshine hours, actual vapour pressure and morning relative humidity collectively explain the variability in grain yield, straw yield, up to 94 and 99 percent.,
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    ThesisItemOpen Access
    Radiation interception and DSSAT validation in cotton (Gossypium hirsutum L.) under different growing environments
    (CCSHAU, 2016) Sagar Kumar; Ram Niwas
    The study entitled ‘Radiation interception and DSSAT validation in cotton (Gossypium hirsutum L.) under different growing environments’ was conducted at the research area of the Department of Agricultural meteorology, CCS Haryana Agricultural University, Hisar, during the kharif season of 2015-16. The main plots treatments consisted of three date of sowing (2nd week of May (D1), 3rd week of May (D2) and 1st week of June (D3) and the sub-plots consisted of three varieties (Pancham 541, SP 7121 and RCH 791). The twenty seven treatment combinations were tested in random block design with three replications. The 2nd week of May sown crop consumed highest thermal and radiation indices. Radiation and heat use efficiency were also highest in this growing environment as compared to 3rd week of May and 1st week of June sown crops. Among cotton varieties, RCH 791 consumed highest heat units, heliothermal units and photothermal units as compared to SP 7121 and Pancham 541 under different growing environments. All growth parameters, yield and yield attributes were found highest in 2nd week of May sown crop. The efficiency of PAR utilization for dry matter production was highest in RCH 791 at all phenophases. The efficiency of heat utilization was also more in RCH 791 as compared to SP 7121 and Pancham 541 at all phenophases. Maximum temperature, minimum temperature, relative humidity morning and evening, wind speed and rainfall showed a positive correlation with dry matter, max. LAI, seed cotton, cotton seed, lint, oil, protein, boll/plant and bolls wt. per plant during vegetative phase, whereas morning and evening relative humidity showed negative correlation during reproductive phase. Relative humidity at morning and evening hours at reproductive phase had significantly negative correlations with seed and biological yields, whereas during vegetative phase, it had positive correlation. The slope value of the regression line shows that growing environment of cotton sown on 2nd week of May was highly efficient in utilizing PAR and accumulation heat units for dry matter production. 99 and 93% variability in dry matter production was explained by IPAR and heat unit, respectively. Among yield parameters, Seed cotton, lint and cotton seed were directly and linearly related with IPAR and IPAR explained 84%, 79% and 85% variability in seed cotton, lint and cotton seed production respectively. The model performance was good for all the three cotton cultivars and for all the growing environments for simulation of days to flowering and physiological maturity. Also the model performance was good for all the cultivars and 2nd and 3rd week of May sown crops for seed cotton yield, biomass and max. LAI but simulation was not satisfactory in case of cotton sown on 1st week of June.