By Sascha W. Felix
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B) The shrimps should be held afterwards in ponds where production of phytoplankton or “lumut“ is maintained depending on the salinity level. (c) This can be accomplished by growing the shrimps in a nursery pond for the first two months and then transferring them to another pond. The second method is to keep the water level in a pond low for the initial two months provided temperature do not raise drastically and then raising the water level sufficiently to encourage the growth of other types of algae.
Since these numbers are percentages, a 50 kg of 12–24–12 would contain 6. 0 kg of K2 O. 7 kg. It is not compulsory to use only inorganic fertilizers organic fertilizers can also be used. The percentage of N and P in few organic fertilizers are given in Table 4. Additional quantity of N or P may be required to obtain maximum benefits from the organic fertilizer. Table 4: Algal Production Vs. Different Fertilizer Combinations Fertilizers Lab-lab Plankton Urea 623. 0 475. 5 Chicken manure + Urea * 514.
These two types of phytoplankton have different nutrient requirements. In laboratory and tank culture, nitrogen (N) to phosphorus (P) ratios of 20 or 30 to 1 have been found suitable for diatoms and ratios close to 1:1 for phytoflagellates. The same nutrient requirements should also hold true for algae growing in ponds. The following table provides the levels of nitrogen and phosphorous required in shrimp ponds for optimal growth of phytoplankton. 4 0. 3 0. 1 0. 95 0. 8 0. 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.