Abstract:
Executive Summary
SAU Perilla-1 (Golden Perilla BD) is a latest oil crop variety enriched with Omega-3 fatty
acid, which is introduced by Sher-e-Bangla Agricultural University in 2021. The seed
contains ⁓40% edible oil and is recommended for growing in Kharif-2 season when no oil
crop is grown in Bangladesh. However, for Robi seasonal trail, the crop was sown on 21
November (D1), 28 November (D2), 05 December (D3), and 12 December (D4) with 40 cm
× 40 cm (S1), 40 cm × 30 cm (S2), and 40 cm × 20cm (S3) planting configurations
maintained in each of the dates. The research was aimed mainly on thermal effects on
phenological parameters (germination, flowering and biological yields) as evaluated by the
Growing Degree Days (GDD) and Heat Use Efficiency (HUE) over stover yield and grain
yield of SAU Perilla-1. The results revealed that sowing dates had significant effect on the
yield variations as evaluated by the studied parameters of the crop. However, D2 showed the
uppermost level of seed weight per plant. The highest seed weight per plant was recorded
due to the effect of S3 and that of the value touched at the bottom for S2. The maximum
seed weight was recorded in D2S3 and that of the lowest was found in D4S3. The GDD
values increased with increasing days to germination of seeds. Sowing date strongly
influenced the GDD requirement for germination of SAU Perilla-1. When the crop was sown
on D1, 75 days were needed accumulating 1670.4℉ for flowering of the crop. The GDD
requirement was highest (1802℉) in D4 sowing treatment, when 82 days were required to
initiate flowering. The GDD requirement declined as sown on D2 and D3 dates. The results
indicated that the variation in temperature prevailed under different dates of sowing. HUE
was higher in producing stover plant when sown on 21
st
November (D1) with second highest
grain production (4.10 mg/plant/℉/Day). Contrary to that the highest HUE for grain (8.13
mg/plant/℉/Day) was yielded in D2 sowing date although the stover production was reduced
from that of D1 treatment found. When sowing is delayed, either of grain and stover
synthesis were lowered down as found in D3 and D4 treatments.
