Growth and radiation use efficiency of Basmati rice (Oryza sativa L.) varieties under different transplanting environments
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Date
2016
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
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.,
Description
Keywords
Rice, Planting equipment, Yields, Crops, Developmental stages, Grain, Planting, Fruits, Biological development, Seasons