National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The phenological development and thermal unit requirements of seven aromatic rice landraces of West Bengal were studied in randomized block design (RBD) with 3 replications at ‘C’ Block Farm (22o 99’ N, 88o 45’ E, 9.75 m.s.l.), Bidhan Chandra Krishi Viswavidyalaya, Kalyani, West Bengal, India during kharif (wet) season of 2008 and 2009. All seven indigenous scented rice cultivars were long-duration types (140.0 – 148.3 days) and differed slightly among themselves towards attainment of different phenophases and accumulation of heat units. Mean cultivar days from sowing to emergence, 4th leaf emergence, active tillering, panicle initiation, 50% flowering, milk, dough and maturity stages were 3.9, 21.4, 47.1, 73.6, 111.3, 122.5, 133.6, 122.5, 133.6 and 144.6 days, respectively. Mean growing degree days (GDD), heliothermal units (HTU) and photohermal units (PTU) were 1449±83, 6473±453 and 18439±999 during vegetative stage, 729±10, 4465±223 and 8679±167 during reproductive stage and 530±23, 4389±254 and 6035±255 during ripening stage, respectively. Based on accumulated GDD, HTU and PTU for entire life cycle, the cultivars could be arranged as: Radhunipagal > Chinikamini > Mohanbhog > Badshabhog > Khasdhan > Gobindabhog > Kalojira. The correlation studies revealed that GDD and HTU at tiller production stage had positive influence on number of panicle m-2, while HTU at ripening stage showed positive impact on grain filling and development leading to higher grain yield. The regression model for grain yield (Y= 3.93 – 0.0138 GDDM-D** – 0.000724 HTUM-D*) showed associations with GDD and HTU both during milk to dough stage and accounted for 34 % variation at 1 % level of significance.
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