Effect of varying sowing dates and nitrogen levels on growth and physiology of scented rice
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Abstract
A field experiment was carried out to determine the influence of sowing dates and nitrogen (N) levels on different growth and physiological parameters of scented rice cv. Pusa Sugandh-3. Significant variation in terms of phenological stages and growing degree days (GDDs) accumulation on rice crop was recorded due to different sowing dates and nitrogen levels. The earlier sown crop took more number of days and GDDs to reach various phenological stages as compared to late sown crop. Among the nitrogen levels, 80 and 60 kg N ha -1
took significantly more number of days and GDDs to reach different phenological stages. The 15th standard meteorological week (SMW) and 16th SMW sown crop recorded significantly higher number of primary and
secondary tillers while tertiary tillers were significantly higher for 18th SMW crop. Pertaining to dry matter partitioning among different levels of nitrogen, significantly more photosynthates were translocated to leaves as well as stem from 45 DAT to harvest at the nitrogen level of 80 kg ha -1 and least in control. Also, more photosynthates were translocated to panicle for 80 kg N ha -1 and least for the control. At harvest significantly higher nitrogen uptake was recorded for the 15th SMW (106.86 kg N ha-1) and 16th SMW (103.64 kg N ha-1) sowing. Nitrogen uptake was significantly higher for 80 and 60 kg N ha -1.
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