Year 2010http://localhost:8080/handle/123456789/27082026-04-18T16:17:42Z2026-04-18T16:17:42ZWEED CONTROL AND YIELD OF WHEAT AS AFFECTED BY BRASSICA ALLELOPATHYRAHMAN, ANISURhttp://localhost:8080/handle/123456789/24092019-09-30T06:10:19Z2010-06-01T00:00:00ZWEED CONTROL AND YIELD OF WHEAT AS AFFECTED BY BRASSICA ALLELOPATHY
RAHMAN, ANISUR
The experiment was conducted at the Agronomy research field, Sher-e-Bangla
Agricultural University, Dhaka from November, 2008 to March, 2009 to find out the
allelopathic effect of Brassica biomass on weed control and yield of wheat. The
treatment of the experiment consisted of 2 levels of field status viz. fallow land (C
)
and field with Brassica (C
2
); 2 levels of maturity viz. 25 days old Brassica (M
) and
35 days old Brassica (M
); and 3 levels of Brassica biomass amount viz. 0 kg
biomass m
-2
(B
1
2
), 0.5 kg biomass m
-2
(B
2
) and 1.0 kg biomass m
-2
(B
). Maximum
weed population at 30 DAS (165 m
-2
) and at 60 DAS (291 m
-2
), dry wt. of weeds at
30 DAS was found in the plots having no biomass. The highest dry weight of weed at
60 DAS was found for the field status from fallow land (107.77 gm
), 25 days old
Brassica (78.80 gm
-2
) & 0 kg biomass application (89.94 gm
-2
). The highest grain
yield was found from Brassica fields (2.68 t ha
-1
), 35 days old Brassica biomass (2.59
t ha
-1
) & 1.0 kg biomass application (2.71 t ha
-1
). The interaction effect of field status
and Brassica biomass concentration showed significant result on weed population
(80.33 m
-2
), dry weight of weed (39.74 g m
-2
), plant height (33.98 cm), number of
effective tillers linear m
-1
(84.67), spike length (16.09 cm), number of filled grain
spike
-1
(50.93), number of leaves plant
-1
(10.53), weight of 1000 grains (41.22 g),
grain yield (2.83 t ha
-1
) and straw yield (4.08 t ha
-1
).The lowest weed population
(124.0 m
-2
) and dry weight of weed (39.11 gm
-2
) at 60 DAS was found from the field
with Brassica field and 25 days old biomass @ 1.0 kg m
-2
. The highest thousand grain
weight (41.84 g) was found from the field with 35 days old Brassica application @
0.50 kgm
-2
. The maximum grain yield (2.86 t ha
-1
) was found from the field with 35
days old Brassica biomass application @ 1.0 kgm
-2
. Weed population and weed dry
weight showed highest result in fallow land with no biomass application. Fallow land,
less matured biomass and no biomass application and their interaction encouraged
growth of weed and dry weight of weed that means Brassica biomass reduced weed
growth in all cases of application. Weed control was quite positive with Brassica
biomass. On the other hand, land with Brassica and application of 35 days old
Brassica biomass @ 0.5 -1.0 kg m
-2
increased yield contributing characters and yield
of wheat.
-2
3
1
1
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 (M.S.)
IN
AGRONOMY
Semester: January–June, 2010
2010-06-01T00:00:00ZPERFORMANCE OF MAIZE AS INFLUENCED BY DIFFERENT LEVELS OF NITROGEN AND SPACINGSHAHIDULLAH, MD.http://localhost:8080/handle/123456789/24082019-09-30T06:10:42Z2010-06-01T00:00:00ZPERFORMANCE OF MAIZE AS INFLUENCED BY DIFFERENT LEVELS OF NITROGEN AND SPACING
SHAHIDULLAH, MD.
An experiment was conducted during April to July 2010 at the Agronomy field laboratory of Sher-e-Bangla Agricultural University, Dhaka to evaluate the performance of maize as influenced by different levels of nitrogen under different spacings. The experiment comprised two different factors; (1) four levels of nitrogen application viz. N1 (180 kg N/ha), N2 (220 kg N/ha), N3 (260 kg N/ha) and N4 (275 kg N/ha) and (2) three different plant spacings viz. S1 (60 cm × 25 cm), S2 (75 cm × 25 cm) and S3 (90 cm × 25 cm). The experiment was set up in randomized complete block design (factorial) with three replications. Results revealed that both nitrogen and plant spacing significantly affected growth, yield and yield contributing characters of maize. The highest nitrogen level N4 (275 kg N/ha) recorded the highest value of all growth parameters at all data recording days whereas the lowest nitrogen level N1 (180 kg N/ha) recorded the lowest values of all the growth parameters. In respect of yield contributing characters and yield, results revealed a different scenario where nitrogen level N2 (220 kg N/ha) obtained the highest values of cob length, number of grains/cob, weight of grains/cob, 1000- grain weight, grain yield and harvest index and the corresponding lowest values were obtained from the lowest nitrogen level N1 (180kg N/ha). The highest spacing S3 (90 cm × 25 cm) though produced the shortest maize plant but it produced the highest number of leaves/plant, leaf area and dry weight/plant and all corresponding lowest values were recorded from the lowest spacing S1 (60 cm× 25 cm). The medium spacing S2 (75 cm × 25 cm) compared to S4 produced lower values in growth parameters but it recorded the highest values in yield contributing characters and grain yield and the lowest values of yield contributing characters and grain yield were recorded from the lowest spacing S1 (60 cm × 25 cm) but the highest stover yield was recorded from S1 and the lowest from S3 spacing. The N2 (220 kg N/ha) in combination with S2 (75 cm × 25 cm) performed the best and obtained the highest cob length (23.40 cm), number of grains/cob (515.76) weigh of grains/cob (146.10 g), 1000- grain weight ( 269.30 g) which contributed to obtain the highest grain yield (4.79 t/ha) and harvest index (38.71%). The corresponding lowest values were obtained from N1 × S1 but the highest stover yield (6.19 t/ha) and lowest stover yield were obtained from N4 × S1 and N1 × S3, respectively.
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 AGRONOMY SEMESTER: JANUARY- JUNE, 2010
2010-06-01T00:00:00ZEFFECT OF WEEDING FREQUENCY AND POPULATION DENSITY ON THE GROWTH AND YIELD OF SESAMEAHMMAD, ALIhttp://localhost:8080/handle/123456789/24072019-09-30T06:11:00Z2010-06-01T00:00:00ZEFFECT OF WEEDING FREQUENCY AND POPULATION DENSITY ON THE GROWTH AND YIELD OF SESAME
AHMMAD, ALI
Abstract
The experiment was conducted at the Agronomy farm of Sher-e-Bangla Agricultural
University to evaluate the effect of four weeding frequencies(W
1
=control, W
=10,
W
3
=20 and W
4
=30 days after emergence) and population densities (P
=66666,
P
2
=33333, P
3
=22222 and P
=16666 plants/ha) on the growth and yield attributes of
sesame. Weeding frequencies resulted in the increase on growth and yield attributes
of sesame. The highest plant height (127.10 cm), number of branches/plant (6.33 cm)
and dry weight/plant (23.63g) were obtained with 3 times weeding (10, 20 and 30
days after emergence respectively). Number of effective capsule/plant (109.60), 1000-
seeds weight (3.19g), grain yield (0.98 t/ha) and harvest index (25.16%) were also
found with same weeding treatment in this study. The highest plant height (136.90
cm) was recorded from the combined effect of 33333 plants/ha and three times
weeding at 10, 20 and 30 days after emergence (DAE) and weeding at 10, 20 and 30
days after emergence (DAE). Weed infestation also affected the lowest plant height
(109.50 cm) was found from 22222 plants/ha
4
with no weeding. But the combined
effect of 16666 plants/ha with three times weeding at 10, 20 and 30 days after
emergence(DAE) revealed the highest number of leaves/plant (31.80), number of
branches/plant (8.30) and dry weight/plant (26.93 g). On the other hand, the highest
number of effective capsule/plant (146.8), number of seeds/capsule (79.20) and 1000-
seed weight (3.86g) were found with the interaction effect of 16666 plants/ha with
three times on growth, yield and yield contributing characters of the crop. The highest
weed significantly biomass (152.1 g/6m
2
) was observed from 16666 plants/ha with
three times weeding at 10, 20 and 30 days after emergence(DAE) whereas the lowest
figure was (27.55 g/6m
2
) recorded from the plots treated with 666666 plants/ha with
1
2 one weeding at 10 days after emergence(DAE). However, the results revealed that the
plots, with highest plant population weeded once, caused lower weed densities. As
such, the combined treatments of 66666 plants/ha with one weeding at 10 days after
emergence showed the lowest infestation, as evaluated by the lowest weed dry weight
(27.55 g/6m
2
), in compare to that of the highest (65.17 g/6m
2
) with 16666 plants/ha
and three times weeding at 10, 20 and 30 days after emergence(DAE).
2010-06-01T00:00:00ZGROWTH AND YIELD OF HYBRID AND INBRED BORO RICE AFFECTED BY DIFFERENT WEED CONTROL METHODSAHAMED, SHAMIMhttp://localhost:8080/handle/123456789/24062019-09-30T06:11:17Z2010-06-01T00:00:00ZGROWTH AND YIELD OF HYBRID AND INBRED BORO RICE AFFECTED BY DIFFERENT WEED CONTROL METHODS
AHAMED, SHAMIM
A field experiment was carried out at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from December, 2008 to May, 2009 to evaluate the Growth and yield of hybrid and inbred boro rice affected by different weed control methods. The experiment comprised of seven weeding treatments viz. no weeding, one weeding at 30 DAT (Days after transplanting), two weeding at 30 DAT and 50 DAT, application of herbicides: Sunrise 150WP recommended dose at 100g ha-1, Sunrise 150 WP 25% higher than the recommended dose, Commit 500EC recommended dose at 1000ml ha-1, Commit 500EC 25% lower than the recommended dose; boro rice varieties viz. Hira-6(hybrid), Sonarbangla-6(hybrid) and BRRI dhan29(inbred). The experiment was carried out in RCBD with three replications. Eight weed species belonging to four families were identified in the experimental field of which Echinochloa colonum, Leersia hexandra, Cynodon dactylon, Cyperus rotundus, Scirpus mucronatus, Spilanthes acmella, Enhydra fluctuans and Desmodium trifolium. Population density of weeds was recorded from 7 DAT to 50 DAT at 7 days interval. It was evident that among the weed control treatments, application of Sunrise 150 WP 25% higher than the recommended dose showed best performance in respect of the highest plant height (103.35cm), maximum tillers hill-1 (22.00), the maximum plant dry matter (192.8g hill-1), effective tillers hill-1(20.34), lowest number of ineffective tiller hill-1(1.33) and consequently produced highest grain yield (9.50 t ha-1), straw yield (10.25 t ha-1) and harvest index (41.16) in comparison all other treatments. Among the weed control treatments, Sunrise 150WP at 25% higher than the recommended dose control 81% weed population, where as Commit 500EC 55% and hand weeding only 52% which was costlier than others. The highest grain yield, straw yield as well as benefit cost ratio was obtained from the variety Sonarbangla-6(hybrid). Application of Sunrise 150 WP 25% higher than the recommended dose increased 22.63% higher grain yield than Commit 500EC 25% lower than the recommended dose and 34.9% higher grain yield than two hand weeding due to higher number of panicles hill-1 and higher number grains panicle-1.
the Department of Agronomy,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements for the degree of
MASTER OF SCIENCE
IN
AGRONOMY
SEMESTER: JANUARY- JUNE, 2010
2010-06-01T00:00:00Z