Abstract:
An experiment was conducted in the net house and the agro-environmental chemistry
laboratory of the Department of Agricultural Chemistry, Sher-e-Bangla Agricultural
University, Dhaka-1207 during the Boro season of the year 2017-18 to evaluate the
mitigation of arsenic stress in BRRI dhan29 with cowdung and inorganic fertilizers. The two
factorial experiment was laid out in a Completely Randomized Design (CRD) with three
replications. Factor A: different doses of arsenic on required water basis [As
=No arsenic
applied, As
1
= 20 ppm arsenic, As
2
= 40 ppm arsenic, As
= 60 ppm arsenic] and Factor B:
different doses of cowdung and inorganic fertilizers [T
0
3
= Recommended dose of cowdung +
inorganic fertilizer, T
1
= Recommended dose of cowdung without inorganic fertilizer, T
=
Recommended dose of inorganic fertilizer without cowdung, T
= Reduction of 20%
recommended dose of inorganic fertilizer + addition of 20% recommended dose of cowdung,
T
4
3
= Reduction of 40% recommended dose of inorganic fertilizer + addition of 40%
recommended dose of cowdung]. Arsenic was added from Sodium Arsenate
(Na
2
HAsO
4
.7H
2
O). In case of fertilizers, T
gave higher results in most growth, yield and
yield contributing parameters (tiller number, effective tiller, filled grain, panicle length, grain
and straw yield) and T
1
4
gave lower results; whereas for arsenic, maximum results were
recorded from As
0
and minimum from As
3
. In interaction, As
0
T
produced higher results and
As
3
T
1
produced lower results in most cases. The treatment T
4
4
gave higher N, P and K content
in straw whereas, T
1
gave lower N, P and K content in straw; highest As content by T
and
lowest by T
4
. In case of arsenic content in shoot, maximum results were recorded from As
and minimum from As
. In interaction, the maximum N, P and K content in straw were found
in As
0
T
4
0
and the minimum were observed from As
3
T
treatment; whereas, highest As by
As
3
T
1
and lowest by As
0
T
4
. Therefore, the treatment T
4
1
0
showed lower arsenic in shoot and T
showed the highest content.
1
2
3
1
Description:
Submitted to the Department of Agricultural Chemistry
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE (M.S.)
IN
AGRICULTURAL CHEMISTRY
Semester: Jan-June, 2018
