Abstract:
An experiment was conducted at the central farm of Sher-e-Bangla Agricultural
University, Dhaka-1207, Bangladesh, during the kharif 1 season (May to September,
2019) to examine the residual effect of chitosan raw material powder on yield
performance of okra under tomato-okra cropping system. BARI Dheros-1 was used as
test crop. The experiment was carried out in the Randomized Complete Block Design
(RCBD) with the four replications. The experiments were consist of five treatments
having four levels of CHT raw material powder. The treatments were T
1
= 0% CHT
raw material powder (control), T
2
= 0.1% CHT raw material powder applied in the
previous expt., T
3
= 0.2% CHT raw material powder applied in the previous expt., T
4
=
0.3% CHT raw material powder applied in the previous expt. and T
5
= 0.4% CHT raw
material powder applied in the previous expt. .Yield and yield contributing characters
positively responded with increasing rate of CHT raw material powder. The fruit yield
significantly increased in T
4
treatment 7.31 t ha
-1
(45.08% yield increased over the
control) compared to T
1
control treatment 5.04 t ha
-1
. But T
3
treatment shows
statistically identical fruit yield 6.36 t ha
-1
(26.19% yield increased over the control)
compare to the T
1
control 5.04 t ha
-1
. The residual effect of the chitosan raw material
powder has a positive effect on the increase of total nitrogen, the highest N value 0.112
% was recorded in T
5
treatments and lowest value was observed in T
1
control treatment.
From the three layer of soil the maximum value of the soil pH 6.74, 6.66 and 6.53 of 030
cm,
30-60
cm
and
60-90
cm
respectively,
organic
carbon
content
0.70%,
0.66%
and
0.60%
of 0-30 cm, 30-60 cm and 60-90 cm respectively, and organic matter content
1.21%, 1.14%, and 1.03% of 0-30 cm, 30-60 cm and 60-90 cm respectively in the postharvest
soils were found in the T
5
treatment and lowest values were observed in the
control treatment. Above discussion revealed that the yield and yield contributing
characters of okra and some chemical properties of soil were improved due to the
residual effect of CHT raw material powder. Residual nitrogen value indicates that the
CHT raw material powder has a slow releasing nitrogen supplementation, soil organic
carbon and soil pH. These results suggest that the residual effect of CHT raw material
powder could play an important role to improve the sustainable soil health.
Description:
A Thesis
Submitted to the faculty of agriculture, Sher-e-Bangla Agricultural
University, Dhaka, in partial fulfillment of the requirements
For the degree of
MASTER OF SCIENCE (MS)
IN
SOIL SCIENCE
SEMESTER: JANUARY-JUNE, 2021
