A 120 day long experiment was conducted to find out the effects of cow manure with urea
and triple super phosphate (CUT), poultry manure with urea and triple super phosphate
(PUT) and cow manure with poultry manure (CP) having similar quantities of nitrogen
and phosphorus on pond productivity and fish yield. The stocking fish were rohu (Labeo
rohita), catla ( Catla catla) and mrigal ( Cirrhinus mrigala) in each treatment pond at the
rate of 10000/ha. All ponds were fertilized fortnightly at the rate of 4000 kg/ha cow
manure with 62 kg/ha urea and 65 kg/ha TSP, 2700 kg/ha poultry manure with 62 kg/ha
urea and 16 kg/ha TSP, and 4000kg/ha cow manure with 2700 kg/ha poultry manure for
the treatment CUT, PUT and CP respectively. Each treatment contained an iso-nitrogen
and iso-phosphorus of 56 kg and 46 kg respectively. Though the physico-chemical
parameters were more or less similar in all ponds, the chlorophyll-a content and
abundance of total plankton were significantly higher (P< 0.05) in the ponds receiving
the fertilizer treatment of PUT than those of other treatments. Final growth as well as
per 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 (1336
kg/ha). The over all results showed that poultry manure with urea and triple super
phosphate 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 was
similar, in carp polyculture system under prevailing conditions
