Pond Water Fertilization – 02 – The Kind and Method

In activity of shrimp culture, mainly the kind of fertilizer that able to be used distinguishable to two categories, there are: (i) an organic fertilizer, and (ii) organic fertilizer. The kind of an organic fertilizer which commonly used is urea (NH2 CONH2) and TSP (Ca(H2PO4), while the organic fertilizer which commonly used is saponin fermentation and out of order shrimp feed fermentation. The Function and dosage which commonly used from each fertilizer relative differ depended from pond water condition and it’s need level pursuant to the perception done in field.

Visually, urea can be recognized from its form that is smooth crystals and have white color and if mixed with the water will felt cold (one of the characteristic from this fertilizer is very easy to permeate the water). The urea is one of the chemical fertilizer considering high rate of Nitrogen (N). The urea is usually used to race or grow phytoplankton which have the character to stabilize within pond water.

One of the other chemical fertilizer types is TSP (Triple Super Phosphate) which is ordinary to be referred with SP-36 and it have nut-brown grey color. Within shrimp culture, TSP applicable to grow the kind of phytoplankton which able to grow zooplankton that able to be made as natural feed for a young shrimps/fries. Usage dose of urea which is often implemented is three times (treble) from TSP dose [at] normal condition and its usage can be used separately and at the same time pursuant to the condition in field.

The organic fertilizer that able to be used in shrimp culture is saponin fermentation or an out of order feed fermentation. The function of this fertilizer is as supplied nutrient element that nothing in an organic fertilizer and required by plankton. Fermentation done in order to a saponin/out of order feed become to destroyed a condition so that expected is easy to permeated by plankton at conducting a photosynthesis process. Besides above mentioned purpose, an organic fertilizer is also meant to stabilize materials composition of the organic in pond water besides also to race zooplankton growth which it’s able to be made as natural feed for the shrimp or other water organism. Giving of organic fertilizer is an incidental and conducted based on monitoring result and pond water need level requirement also shrimp condition.

The feed which given to shrimp principally can functioned as organic fertilizer for pond water and assist in course of forming of stability of plankton in pond. This phenomenon can be met and perceived at pond with high density shrimp population and amount of bigness feeding. At this condition the stability of plankton in pond water will be formed by itself without existence of fertilization, because the elements within shrimp feed is also permeated by plankton to support its growth in the pond water.

The method of pond water fertilization is related with water circulation under color of idea that pond water volumes very have an effect on to effectiveness of fertilization activity. This condition can be interpreted that at same usage dose, its influence and effectiveness level will relative differ if passed to the pond water with different water volume. Pursuant to this matter hence before done the fertilization is usually done water circulation beforehand by reducing the water volume and add the new water into pond come up with height of the water is lower relative, then just done by the fertilization.

Activity of fertilization better be avoided at pond water that have case as in under:

1. Pond water transparency is very low so that it’s causing very high plankton abundance. At this condition if fertilization is still conducted hence it will direct to pond water in the situation plankton booming which can able to endanger the shrimp, so that anticipation which can able to be done is by doing water circulation continuously especially at night with a purpose to thinning of pond water.
   
   
2. Pond water with have a dominancy of plankton having the character of harm for shrimp.
   
   
3. Pond water there has no plankton seed. Activity of fertilization at pond water is in this condition will race the growing of moss in pond.
   
   
4. Pond water which growed with too much moss. The fertilization will only fertilize the moss in pond, so that anticipation that able to be done is by lifting the moss to exit in front then following the forming of water.

The result parameter of pond water fertilization activities that commonly used is change water transparency level and or change of pond water color. At fine weather, the result and influence of fertilization to pond water can monitored in the evening by comparing change of transparency level and water color before and after fertilization. Transparency pond water used as a changes parameter of plankton abundance as effect from fertilization activity, while change of pond water color used to see dominancy change of selected plankton kind in the pond water.

At fine weather, a photosynthesis activity done by phytoplankton is create perfect relatively, because its assisted by sun’s rays directly which cause absorption of the elements that contain in fertilizer e by phytoplankton also take place the perfection, so that influence of fertilization will soon can perceive.

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