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The broad objective of this study is to determine a cost-effective
method for composting of poultry manure. Specific objectives of the
study are:
· To determine
suitable methods of composting for farmers
· To evaluate the effects of EM on the composting process
· To evaluate physical and chemical parameters of compost
such as moisture, pH, organic, carbon, total nitrogen, phosphorus,
potassium, sulfur, zinc, calcium, and magnesium.
· To evaluate the impact of the compost on various crops
· To recommend a suitable model for composting poultry waste
using public-private partnership approach.
2. To achieve the objectives
of the research WCC selected two methods of composting process conducted
in two batches in two seasons (1st batch: Sept. to Oct. 2002 and
2nd batch: Dec. 2002 to Mid Feb. 2003). Total 4 (four) inputs like
household waste (HW), chick litter (CL); layer dropping (LD) and
Rice husk (RH) have been used for the experiment.
3. Impact of effective
micro- organism (EM) has been tested during the composting process
to control order and reduce decomposition time of composting.
4. Data have been collected
in different phases of composting process under each method to analyze
different parameters of composting process in the Laboratory.
5. Field Demonstrations
have been set-up to study the impact of compost (produced thought
the different methods of the research) on soil and crops in Rajendrapur
of Gazipur District near Dhaka.
6. To disseminate findings
of the research a seminar entitled ` Prospects of Composting Poultry
Manure in Bangladesh was successfully organized by PSDP (CIDA-DLS)
on 30th March 2003 at NARS Conference Hall, BARC, Dhaka. This seminar
was participated by officials, entrepreneurs and scientists from
private sectors, public sectors, NGOs and universities. During this
one-day workshop a site visit (to the experimental sites in Mirpur
of Dhaka city) was organized for the participants to enable them
to have a first hand experience of poultry waste composting.
7. In order to identify
the best method of composting from 40 trials conducted in two seasons
(20 trials in each season), a method of weighting and ranking has
been adopted. 7 (seven) criteria have been identified under 4 (four)
broad categories of indicators for selection of the best method
of composting.
8. It is evident from
the research that co-composting of poultry manure is the best option.
In terms of method of composting overall box method has shown better
results in the combined score as well as individually in First Batch
I and Second Batch.
9. Composting of chick
litter and layer droppings using box method of composting has shown
acceptable results considering the product safety, quality of product
and financial viability in both the batches. This combination and
technique is suitable in case of poultry farms, where household
waste is not available
10. Results obtain from
first and second batch of composting process show that the use of
EM did not influence on temperature curve during the composting
process.
11. Findings of the study
show that co-composting of household waste with poultry waste takes
less time than composting of poultry waste alone.
12. Maturity duration
for the first batch varied from 35 days to 40 days whereas for the
second batch it varied from 45 days to 60 days. Highest maturity
duration (60 days) was found in the combination of LD+RH in second
batch of the composting process. Impact of seasonal variation on
maturity duration has been found. As trials conducted during the
second batch in winter season took comparatively more time than
others due to unnatural extreme cold weather in Bangladesh during
the composting period of the experiment.
13. Recovery rate of
composting of poultry waste is higher than co-composting of household
waste with poultry waste, because the poultry waste contains more
solid material than household waste. Recovery rate of poultry waste
varied from 52 to 63% and co-composting of household waste with
poultry waste varied from 20 to 28%. Significant seasonal variation
on the recovery rate of composting process was not found from the
study.
14. Results obtained
from laboratory shows that moisture content was optimum level in
all cases of the study.
15. pH value of co-compost
(household waste + poultry waste) and poultry compost is more than
8.0 except in case of CL and LD+CL. Co-compost of household waste
with poultry waste has been shown higher pH value (8.4), which is
the most favorable for the acidic soils of Bangladesh to neutralize
the soil reaction.
16. Observation of the
study shows that the use of Effective Microorganism (EM) has completely
eliminated of offensive odor in both of box and windrow methods
of composting process. This research showed that use EM did not
show significant effect on organic matter content, maturity duration,
temperature, and nutrient content in composts.
18. Organic matter content
in compost produced from household waste and poultry waste varies
from 34.5 % to 41.5 %, which is similar to international standard
of compost (organic fertilizer). At present there are 22,570 nos.
of Commercial Poultry Farms in Bangladesh (Layers: 84,10,000 and
Broilers: 57,84,500).
Poultry Waste Generated from these commercial poultry farms is almost
4474 tons/day in Bangladesh. Considering 40% recovery rate (conservative
estimate) of compost produced from 4474 tons of poultry manure every
day 1790 tons of compost can be produced. The market value of compost
produced from poultry farms will be Tk. 1630 million every year.
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