Fertilizer Application

• Natural fertilizer such as cow/chicken manure, green manure and compost and chemical fertilizer can be used to be abundant of natural food and to reduce the supplementary feed.

• Fertilizers promote the growth of phytoplankton and production of natural food.

• 15-20 kg of urea and 7.5-10 kg of TSP per ac can be used for normal primary production.

• TSP must be soaked overnight and at the next morning, 10-11 am, mix urea, water and soaked TSP, and then broadcast them evenly to grow plankton on the surface. 

• Since fertilizers, especially TSP, take time to dissolve into water, should avoid direct application without soaking in water.

• Fertilization should be used weekly or biweekly throughout the cultural period so that natural food can be maintained.

Points to be aware in fertilizer application

• Aware not to over fertilize.

• Avoid fertilizer application if the pond water appears turbid.

• Avoid fertilizing on extremely hot days if the water is shallow.

• Avoid applying fertilizer if it is raining or cloudy.

• Avoid fertilizing 2-3 days before and after harvesting.

• Ensure well dissolving of fertilizer before application.

• If the pond water color is not the desired color, light green, stop fertilization application. 

• In the winter season, the amount of fertilizer should be half or less than the amount applied in summer.