Effects of iso-nitrogenous and iso-phosphorus fertilizers as nutrient sources on carp polyculture in Bangladesh
A 120 day long experiment was conducted to find out the effects of cow manure with ureaand triple super phosphate (CUT), poultry manure with urea and triple super phosphate(PUT) and cow manure with poultry manure (CP) having similar quantities of nitrogenand phosphorus on pond productivity and fish yield. The stocking fish were rohu (Labeorohita), catla ( Catla catla) and mrigal ( Cirrhinus mrigala) in each treatment pond at therate of 10000/ha. All ponds were fertilized fortnightly at the rate of 4000 kg/ha cowmanure with 62 kg/ha urea and 65 kg/ha TSP, 2700 kg/ha poultry manure with 62 kg/haurea and 16 kg/ha TSP, and 4000kg/ha cow manure with 2700 kg/ha poultry manure forthe treatment CUT, PUT and CP respectively. Each treatment contained an iso-nitrogenand iso-phosphorus of 56 kg and 46 kg respectively. Though the physico-chemicalparameters were more or less similar in all ponds, the chlorophyll-a content andabundance of total plankton were significantly higher (P< 0.05) in the ponds receivingthe fertilizer treatment of PUT than those of other treatments. Final growth as well asper unit production of fish of treatment PUT (1773 kg/ha) was significantly higher (P<0.05) than that of treatment CP (1528 kg/ha) followed by that of treatment CUT (1336kg/ha). The over all results showed that poultry manure with urea and triple superphosphate proved to be superior to cow manure with urea and triple super phosphate,and poultry manure with cow manure, even when nitrogen and phosphorus content wassimilar, in carp polyculture system under prevailing conditions.
| Main Authors: | , , , |
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| Format: | article biblioteca |
| Language: | English |
| Published: |
2002
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| Subjects: | Aquaculture, Fisheries, Iso-nitrogenous, Iso- phosphorus fertilizer, Polyculture, |
| Online Access: | http://hdl.handle.net/1834/33291 |
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