 | Workshop to Produce an Information Kit on Farmer-proven. Integrated Agriculture-aquaculture Technologies (IIRR, 1992, 119 p.) |
 |  | (introduction...) |
| | Introduction |
| | Workshop of participants |
| | Bibliography on integrated farming |
|  | Economic, sociocultural and environmental considerations in introducing integrated agriculture-aquaculture technology |
| | Sociocultural considerations when introducing a new integrated agriculture - aquaculture technology |
| | Economic considerations in introducing integrated agriculture-aquaculture technologies |
| | Working with new entrants to integrated agriculture -aquaculture |
| | Integrated agriculture-aquaculture and the environment |
| | Integrated farming systems |
| | Integrated grass-fish farming systems in China |
| | Chinese embankment fish culture |
| | The V.A.C. system in northern Vietnam |
| | Fodder-fish integration practice in Malaysia |
| | Indian integrated fish-horticulture vegetable farming |
| | Culture of short-cycle species in seasonal ponds and ditches of Bangladesh |
| | Animal-fish system |
| | (introduction...) |
| | Integrated fish-duck farming |
| | Integrated poultry-fish farming |
| | Integrated fish-pig farming (1000 sq meter unit: India) |
| | Backyard integrated pig-fish culture (100-150 sq m unit: philippines) |
| | Rice-fish systems |
| | (introduction...) |
| | Low-input rice-fish farming system in irrigated areas in Malaysia |
| | Rice-fish systems in Indonesia |
| | Sawah Tambak rice-fish system in Indonesia |
| | Rice-fish systems in China |
| | Rice-fish system in Guimba, Hueva Ecija, Philippines |
| | The case of rice-fish farmer mang isko,dasmarinas, cavite, the Philippines |
| | Management for rice-fish |
| | (introduction...) |
| | Site selection: where to culture fish with rice' |
| | Preparation of field for Rich - fish culture |
| | Stocking for rice-fish culture |
| | Feeding and maintenance in rice-fish system |
| | Rice management in rice-fish culture |
| | Rice-fish benefits and problems |
| | The rice-fish ecosystem |
| | Fish as a component of integrated pest management (ipm) in rice production |
| | Fish management and feeding |
| | Using animal wastes in fish ponds |
| | Sewage-fed fish |
| | Biogas slurry in fish culture |
| | Plant sources of feed for fish |
| | Fish breeding and nursing |
| | (introduction...) |
| | Carp breeding using off- season wheat fields |
| | Nursery system for carp species |
| | Fry nursing in rice-fish systems |
| | Fingerling production in irrigated paddy |
Biogas slurry in fish culture
Cowdung is commonly used as a fertilizer for fish ponds in India but fish production is limited to 15002000 kg/ha. These yields can, however, be more than doubled if the dung is first fed to a biogas plant and the digested slurry then used instead of the raw dung. The following methodology for a 0.4 ha pond exemplifies the technology.
Figure
1. Prepare the pond using the urea-bleaching powder
· method or by draining-drying in June.
2. Stock the pond with 2000 (5-8 9) fingerlings of six Asiatic carps: catla 20, rohu 25, mrigal 20, silver carp 20, grass carp 5 and common carp 10.
3. Fertilize the pond daily with 30 litres of biogas slurry. The slurry is rich in nitrogen and phosphorus, and is free from toxic gases which are produced when cowdung decomposes in ponds.
Excess slurry is used for the field while the gas is used both in the kitchen and for lighting the house.
The slurry is not applied on a cloudy day or when the fish come to the surface gulping air.
4. Surface feeders will be about 1 kg in six months. All marketable fish are then harvested every two months and replenished with an equal number of fingerlings. A total of 2000 kg of fish is obtained using biogas slurry as against 800 kg if raw cowdung were used.
ADVANTAGES
· Saving on inorganic fertilizers and feed (60% of operation costs).
· Environment-friendly—no oxygen demand.
· Saving on fuel and electricity.
· Cooking with biogas removes drudgery of womenfolk and helps in keeping the kitchen and environment clean.
LIMITATION
· Slurry/gas production is poor during cloudy days or when temperatures are low.
Biogas slurry.babed fish culture on a 0.4 ha pond.
|
Operational Expenses: |
Rs |
|
Cost of pond preparation |
800 |
|
Cost of seed |
400 |
|
Transport |
1 00 |
|
Imputed cost of biogas plant (2 units, ddpreciation vain. On5-year life span) |
2000 |
|
Lime (80 kg) |
400 |
|
Netting charges |
500 |
|
Total |
4,200 |
|
Receipts: | |
|
Sale of 2000 kg fish at Rs 15/kg |
30,000 |
|
Net income |
25,800 |
Note: 1 U$ = 25.50 Rs
|
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