Abstract:
The experiment was conducted in the farm of' Sher-e-Bangla Agricultural
University. Dhaka. Bangladesh during the period from December 2011 to May
2012 to study the influence of AWD (Alternate Wetting and Drying) irrigation
system on the growth and yield of born rice (BRRI dhan29). The experiment
consists of I factor that is irrigation. Nine levels of irrigations as 'l': Continuous
submergence (1 to 7 cm standing water),T
2
: Start irrigation when water table in
the porous tube at 15 cm.T3
: Start irrigation when water table in the porous tube at
10 cm, 1i: Start irrigation when water table in the porous tube at 5 cm,Tc: Start
irrigation when disappearance of water by naked eyes. Ti,: Start irrigation after 7
days disappearance of water.T
7
: Start irrigation after 5 days disappearance of
water.T8: Start irrigation after 3 days disappearance of water.T
9: Start irrigation
after I days disappearance of water were used and there were 3 replications.
Results revealed that different levels of irrigation had significant effect on the
yield and yield parameters. The highest plant height (88.20 cm), total number of
tillers/hill (26.60), number of effective tillers/hill (21.50) were found from T
5 T1
T4
treatments respectively. The highest paniele length (31.53 cm), number of
grains/panicle (215.73), 1000 grain wt. (24 g), grain yield (7.70 tlha) and straw
yield (7.53 tJha) were found from i'
4
treatment where irrigation was started when
water table in the porous tube was at 5
cm followed by •I t
treatment. On the other
hand in most cases lowest values were obtained from
16
treatment. Nutrient
concentration in grain and straw of rice plant was significantly affected by
application of different levels of irrigation. The highest concentration of grain N
(1.197%). p (0.379%), K (0.395%) and S (0.097%) were recorded from l
treatment and in all eases lowest value were observed in T6
treatment. Similarly
the highest concentration of straw N
(0.567%),
p (0.198%). K (1.873%) and S
(0. 100%) were recorded from T4
treatment and in all cases the lowest values were
observed in T,-, treatment. The p1-I, organic matter and levels of N and S of post
harvest soil were significantly affected by different levels of irrigation but P and K
content of post harvest soil do not differ significantly. The highest p1-1 (5.5) and
organic matter (1.28%) were observed from T
T
treatment and highest total N
(0.075%). available P (12.92 ppm), exchangeable K (0.19 meq/100 g soil) and
available S (11.05 ppm) were recorded from 1'
4 treatment. The lowest pH
(5.9),
organic matter (1.03%), total N (0.061%), available P (10.28 ppm), K (9.31 ppm)
and available S (8.70 ppm) were recorded from T
6 treatment in all the cases.
Description:
A Thesis
Submitted to the Department of Soil Science
Slier-c-Bang/a Agricultural University, DIm/ca
in partialfuljullrnent of the requirements
for the degree
of
MASTER OF SCIENCE (M.S.)
IN
5011. SCIENCE
SEMESTER: JANUARY-JUNE, 2013