Effects of different sowing dates on the phenology and accumulated heat units in three rapeseed (Brassica campestris L.) varieties
Keywords:Phenology, Growing degree days, Heat use efficiency, Pheno-thermal index
A field experiment was carried out to study the effect of sowing dates on phenology and accumulated heat units of rapeseed (Brassica campestris L.). Seeds of three varieties (BARI Sarisha-14, BINA Sarisha-5 and BINA Sarisha-6) were sown on four different dates from October to December (S1-18 October, S2-2 November, S3-17 November and S4-3 December). The results indicated that the number of days required to attain different phenological stages decreased with delay in sowing. For all the phenological stages, S1 required higher heat units than that of other sowings. The plants of S1 used heat more efficiently than S2, S3 and S4. At the earlier phenological stages, phenothermal index decreased with delay in sowing, but increased at the later stages.
Bangladesh J. Bot. 44(1): 97-101, 2015 (March)
How to Cite
© Bangladesh Botanical Society
Authors are required to transfer the copyright of their articles to the journal. The Declaration form is available here http://www.bdbotsociety.org/journal/journal_pdf/declaration_form.pdf