Effects of different sowing dates on the phenology and accumulated heat units in three rapeseed (Brassica campestris L.) varieties

Authors

  • Mst Towhida Akhter Institute of Biological Sciences, University of Rajshahi, Rajshahi-6205
  • MA Mannan Department of Botany, University of Rajshahi, Rajshahi-6205
  • PB Kundu Department of Botany, University of Rajshahi, Rajshahi-6205
  • NK Paul Department of Botany, University of Rajshahi, Rajshahi-6205

DOI:

https://doi.org/10.3329/bjb.v44i1.22730

Keywords:

Phenology, Growing degree days, Heat use efficiency, Pheno-thermal index

Abstract

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.

DOI: http://dx.doi.org/10.3329/bjb.v44i1.22730

Bangladesh J. Bot. 44(1): 97-101, 2015 (March)

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Published

2015-03-26

How to Cite

Akhter, M. T., Mannan, M., Kundu, P., & Paul, N. (2015). Effects of different sowing dates on the phenology and accumulated heat units in three rapeseed (Brassica campestris L.) varieties. Bangladesh Journal of Botany, 44(1), 97–101. https://doi.org/10.3329/bjb.v44i1.22730

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