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M. Sc. Dissertations
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ThesisItem Open 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.,