July 16, 2017

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By Sascha W. Felix

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The firm soil provides a good surface for algal attachment. A word of caution is needed concerning the drying of pond bottom in areas of high acidity levels. In pyrite soil, during the drying process, parameters are optimized and when the pond is filled with water acid is formed and pH of the water is lowered. This type of pond should be flushed thoroughly after drying. It is suggested that for lab-lab production in ponds with hard bottom, the soil should be tilled after drying. Tilling of soil helps largely in the mineralization of organic matter.

7 0. 6 0. 4 0. 3 0. 03 One of the most important factors to be considered in a programme of fertilization is that both nitrogen and phosphorus do not remain in solution for very long duration after they are added to the pond water. They become incorporated in living organisms or into the bottom soil. This is especially true for nitrogen as larger amounts are added. Following the application of ammonium-bearing fertilizer, most of the added nitrogen would be absorbed by colloids in the bottom soil within a few days and remained strongly bound there.

5 172. 5 Means 497. 0 437. 3 *: 46–0–0; **: 16–20–0; ***: 0–20–0. It can be seen that highest production in those ponds managed for plankton could be obtained when additional N is supplied. Conversely, highest production in the ponds managed for lab-lab could be obtained when additional P is added. Irrespective of the species cultured high plankton production will be associated with more N in relation to P. Mode of Fertilizer Application The platform method is an effective way to apply inorganic fertilizers to ponds for producing good growth of phytoplankton as the nutrients from the fertilizer on the platform can be released slowly and distributed through out the pond by water movement.

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