Parameters   P levels at different stocking densities
  7,500/ha 10,000/ha 12,500/ha
Inputs Kg/ha % Kg/ha % Kg/ha %
Inflow water 0.35 ± 0.02 0.65 0.35 ± 0.02 0.65 0.35 ± 0.02 0.64
Cow dung 15.75 ± 1.16 29.36 15.75 ± 1.16 29.12 15.75 ± 1.16 28.9
GOC 1.62 ± 0.10 3.02 1.79 ± 0.11 3.3 1.94 ± 0.12 3.55
RP 2.27 ± 0.16 4.23 2.48 ± 0.17 4.58 2.69 ± 0.18 4.93
SSP 33.50 ± 2.12 62.44 33.50 ± 2.12 61.94 33.50 ± 2.12 61.46
Stocked fish 0.16 ± 0.01 0.3 0.22 ± 0.01 0.41 0.28 ± 0.02 0.52
Total input 53.65 ± 2.76 100 54.09 ± 2.77 100 54.51 ± 2.80 100
Output            
Effluent water 1.20 ± 0.06 2.23 1.68 ± 0.07 3.1 1.92 ± 0.08 3.52
Harvested fish 8.50 ± 0.20 15.84 6.99 ± 0.18 12.93 4.96 ± 0.14 9.1
Sediment accumulation 40.50 ± 3.12 75.48 38.40 ± 3.36 71 38.16 ± 3.20 70
Others 3.45 ± 0.15 6.45 7.02 ± 0.20 12.97 9.47 ± 0.23 17.38
Fcal= 81.68, Ftab = 5.14 at 5% level, CD = 0.672
Table 2: Input, output and balance of phosphorus (P) in the polyculture of Indian major carps
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