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

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 (S 1 -18 October, S 2 -2 November, S 3 -17 November and S 4 -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, S 1 required higher heat units than that of other sowings. The plants of S 1 used heat more efficiently than S 2 , S 3 and S 4 . At the earlier phenological stages, phenothermal index decreased with delay in sowing, but increased at the later stages.

Heat Accumulation, Nutrient Content and Yield of Wheat (Tritichum Aestivum L.) Varieties in Bangladesh

“…Phenothermal Index (PTI) was found the highest (16.63 GDD/day) in BARI Gom-33 which was identical with those of BARI Gom-21 and BARI Gom-23 but the lowest (15.83 GDD/day) was found in BARI Gom-32 (Table 1). The results are in agreement with the observation of Akhter, et al [19].…”

Influence of Different Sowing Date on the Morphology, Phenology and Thermal Indices of Rapeseed: A Review

“…Adak and Chakravarty [28] found that fewer heat units were absorbed on October 30 than on October 15 sown brassica. Akhter et al [18] laid out a field experiment of rapeseed on four different dates on S1-18 Oct, S2-2 Nov, S3-17 Nov, S4-3 Dec and the results showed that the growing degree day (GDD), heliothermal unit (HTU) and heat use efficiency (HUE requirement decreased with delayed sowing to different phenological stages and S1 required the highest followed by S2, S3 and S4 at all phenological stages. S1 plants required 485.77 GDD for bud initiation, 554.90 for flowering initiation, 802.72 for pod filling and 1020.70 GDD for physiological maturity in an average of 2 years (Table 6).…”

EFFECT OF SOWING DATE ON SOME AGRONOMIC AND TECHNOLOGICAL TRAITS OF SAFFLOWER (Carthamus tinctorius L.) IN NORTHERN TURKEY

“…Nikabadi et al (2008) indicated that number of seeds per head and the seed yield decreased as the sowing date was delayed. Akhter et al (2015) indicated that the delay in sowing led to forced maturity and low productivity due to hightemperature rates at later growth stages of crop and improper vegetative growth. Beech and Norman (1963) reported that the reduction in vegetative vigour and shortening of the reproductive phase of late sowing safflower plants contributed to the decline of seed and oil yield.…”