Abstract:
A research work was carried out at the Research Farm, Sher-e-Bangla Agricultural
University, Dhaka during the period from December 2015 to April 2016 in order to
determine the suitable urea deep placement applicator and observing the growth
performance with a view to increase the grain yield of boro rice. The experiment
consisted of one factors. Factor: T
0
= Control plot, T
= Application of urea briquette by
hand placement, T
2
1
= Application of urea briquette by battery- powered applicator, T
=
Application of urea briquette by BRRI applicator, T
= Application of urea briquette by
injector applicator, T
5
4
= Application of urea briquette by push- type applicator, T
=
Application of prilled urea by broadcast method. The experiment was set up following
randomized complete block design with three replications. Experimental results showed
that nitrogen sources and application methods had significant effect on plant height,
effective tiller no/ hill, grain yield, straw yield, biological yield and harvest index. The
application of T
treatment showed the highest grain yield (5.82 t /ha) and straw yield
(7.28 t/ha) than any other sources of nitrogen and methods of application. Experimental
results showed that nitrogen sources and application methods had significant effect on
NH
4
+
3
concentration in standing water of experimental paddy soil. The higher ammonium
concentrations (9.17 ppm) were found in the water of T
(Application of prilled urea by
broadcast method) treatment during 1-7 days of water samples. The soil ammonium
concentrations were significantly affected by nitrogen sources and application methods.
The higher soil ammonium concentrations (120.3 mg/kg dry soil) were observed in the
treatment of T
3
6
(Application of urea briquette by BRRI applicator) during 1-7 days of
collected soil samples.
Findings revealed that when urea briquette was placed with BRRI applicator showed the
superiority over other sources of nitrogen and application methods to produce higher
grain yield of boro rice.
Description:
A Thesis
Submitted to The Department of Soil Science,
Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka
In partial fulfillment of the requirements for the degree of
MASTER OF SCIENCE (MS)
SOIL SCIENCE
