Abstract:
The experiment was conducted at the research farm of Bangladesh Agricultural
Research Institute. Gazipur during October 2008 to March 2009 to evaluate organic
manure on the yield of broccoli under integrated nutrient management system. The
experiment was laid out in a randomized complete block design having three
replications with ten treatments viz. T1 : 100% RD + 2.5 t PM hi', T
2:100% RD +
2.5 t CD hi
1
, T: 100% RD only, 14:
75%
RD + 5 t PM ha', T:
75% RD + 5 t CD
hi', T6: 75% RD only,
T7:50%
RD + lOt PM hi',
TE:
50% RD + 5 t CD hi', 19:
50%
RD only and T,
0: native nutrient (control). The effect of organic manure
integrated with inorganic fertilizers on the yield contributing characters and yield of
broccoli assessed by the field experiment showed that 100% recommended dose of
fertilizer along with 2.5 tPM hi' performed best in most cases e.g. plant height (cm)
at initial and final harvesting, number
of leaves planf', length of curd (cm),
circumference
of
curd (cm), individual curd weight (g plani') and curd yield. The
treatments which received poultry manure with inorganic fertilizers in INM approach
produced better results than those of the treatments receiving CD as organic
amendments. The longest curd (23.57 cm), maximum circumference of curd (53.30
cm), heaviest individual curd of broccoli (445 g) and maximum curd yield (18.97 t
hi') of
broccoli was found from 100% RD and 2.5 t PM hi' treated plots which
were statistically superior to all other treatments. A significant variation in curd yield
hi' of
broccoli was found significant in response to different combination of organic
and inorganic fertilizer in an integrating approach. Poultry manure showed
superiority in most cases over cowdung.
Significant differences among the treatments in case
of
N content and N uptake by
broccoli curd were noticed. The treatment, 100% RD and 2.5 t PM hi' contained the
highest N, P, K and Zn content which were 4.76% N, 0.60% P, 1.92% K, 1.02% and
55.33ppm Zn, respectively. The same treatment also gave the highest N, P, K, S and Zn uptake which were 94.64, 12.0, 38.17, 20.29 and 0.11 kg hi', respectively. The cowdung amendments along with inorganic fertilizer performed laggard in the
treatment series and PM amendments along with inorganic fertilizer showed the
pit-
eminence in performance.
The highest organic matter content (1.44 %) in the post harvest soil of broccoli was
found in the treatments of 50% RD along with lot CD hi' followed by the treatment
of 50% RD along with 10 t PM hi'. In most of the treatments having N from both the
organic and inorganic sources have some residual soil N. The highest amount of total
N (0.78%) and the highest amount of residual P
(35
pg g
4
) after harvest was recorded
in the treatment
of
50% RD along with lOt PM hi'. The highest K status of post
harvest soil (0.1 lmeq 100 g1
soil) was recorded in the treatment of RD 50% along
with 10 t CD hi'. The K status decreased in all the treatments indicating some
mining of K from the native source. The highest Zn content (2.3 pg g') in soil of
broccoli was recorded from
75
RD% along with 5 t CD
hi'.
So, application of
poultry manure can supplement a large amount of soil nutrients for the standing crop
as well as enrich the soil health providing improved chemical and physical properties.
Description:
A Thesis
Submitted to the Department of Soil Science
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
SOIL SCIENCE
SEMESTER: JULY-DECEMBER, 2009