Abstract:
A field experiment was conducted at the Horticulture Farm of Sher-e-Bangla
Agricultural University, Sher-e-Bangla Nagar, Dhaka, from June 2021 until October
2021 to evaluate the influence of Clybio (biostimulant) concentrations on the growth
and productivity of summer onions (Allium cepa). The variety used was BARI Piaz-3.
The single factorial experiments were laid out in a Randomized Complete Block
Design (RCBD) with three replications. The experiment consisted of four treatments,
namely, T
0
= control (no Clybio application), T
1
= Clybio @ 2 ml/L, T
2
= Clybio @ 4
ml/L and T
3
= Clybio @ 6 ml/L, and in total, this was applied six times, starting from
10 DAT until 60 DAT and were applied in a foliar manner to both leaves and
surrounding soil. Among the treatments, the maximum plant height (60.8cm), the
number of leaves per plant (16.7), leaf length (54.2cm), leaf weight (31.3g), diameter
of pseudostem (11.9mm), root length (8.4cm), number of roots (33.0), bulb diameter
(43.8mm), bulb length (52.7mm), weight of a single bulb (45.7g), average bulb yield
per plot (33.2 t/ha) was recorded at T
3
treatment. The highest length of pseudostem
(49.4 mm) was found in the T
1
treatment. On the contrary, the minimum plant height
(38.3cm), number of leaves per plant (7.0), leaf length (24.1cm), leaf weight (17.7g),
root length (4.5cm), number of roots (26), bulb diameter (22.7mm), bulb length
(42.0mm), weight of a single bulb (22.0g), average bulb yield per plot (16.0 t/ha) was
observed at T
0
(control) treatment. The lowest diameter of the pseudostem was found
at the T
1
(7.5mm). No statistically significant variation was found in the length of the
pseudostem (mm) in response to different treatments. When compared to control (T
0
),
the highest increase in yield percentage was observed at T
3
treatment (107.5%) . A
highly significant, very strong (R
2
= 0.99) and positive correlation was discovered
between bulb weight and root length, indicating that bulb weight increased as root
length increased. Considering the aforementioned findings, T
3
(Clybio @ 6 ml/L)
treatment delivered the best results in terms of growth and yield attributes of summer
onions.
Description:
A Thesis
Submitted to Department of Entomology,
Faculty of Agriculture.
Sher-e-Bangla Agricultural University,
Dhaka-
In partial fulfillment of the requirements for the degree of
MASTERS OF SCIENCE (MS)
IN
DEPARTMENT OF HORTICULTURE
