Inorganic fertilizers

• Are chemical fertilizers that dissolve in the pond water and provide their nutrients immediately.
• Are following types:

1. Nitrogenous fertilizers:

• Urea, Ammonium sulfate.

2. Phosphorus fertilizers

• SSP, TSP

3. Compound fertilizers

• DAP

Advantages of inorganic fertilizers

• Exact composition of nutrients available.
• Mineralization is very fast, giving quick effect on pond productivity.
• Easy to transport.
• Lack of pollution.
• No Effect on pond depths.

Disadvantages of inorganic fertilizer

• Costly, not easily available.
• Slow growth of zooplankton.
• Effective for short period.
• May create water quality problem.

Time of fertilization in fish pond

• New pond, and good bottom mud has not yet formed.
• When the pond water is transparent. ( Secchi disk visibility >40 cm).
• Periodic basis ( one- or two-week interval)
• When the pond is not green in color.