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close this bookWorkshop to Produce an Information Kit on Farmer-proven. Integrated Agriculture-aquaculture Technologies (IIRR, 1992, 119 p.)
View the document(introduction...)
View the documentIntroduction
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close this folderEconomic, sociocultural and environmental considerations in introducing integrated agriculture-aquaculture technology
View the documentSociocultural considerations when introducing a new integrated agriculture - aquaculture technology
View the documentEconomic considerations in introducing integrated agriculture-aquaculture technologies
View the documentWorking with new entrants to integrated agriculture -aquaculture
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close this folderIntegrated farming systems
View the documentIntegrated grass-fish farming systems in China
View the documentChinese embankment fish culture
View the documentThe V.A.C. system in northern Vietnam
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close this folderAnimal-fish system
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View the documentIntegrated fish-duck farming
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View the documentIntegrated fish-pig farming (1000 sq meter unit: India)
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close this folderRice-fish systems
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View the documentLow-input rice-fish farming system in irrigated areas in Malaysia
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View the documentSawah Tambak rice-fish system in Indonesia
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View the documentThe case of rice-fish farmer mang isko,dasmarinas, cavite, the Philippines
close this folderManagement for rice-fish
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View the documentSite selection: where to culture fish with rice'
View the documentPreparation of field for Rich - fish culture
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close this folderFish management and feeding
View the documentUsing animal wastes in fish ponds
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View the documentBiogas slurry in fish culture
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close this folderFish breeding and nursing
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View the documentCarp breeding using off- season wheat fields
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View the documentFingerling 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