Page 46 - Final Report Improving information and developing a repository of sustainable soil management practices in Asia

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The area used for fish farming is semi-arid. It receives 1,001-1,500 millimeters of rain on

average. The annual rainfall averages 1241.6 milliliters (data from the Meteorological Station:
Meteorological Department). The terrain is flat. Plateau height is 101-500 meters, soil depth is 81-

120 cm. The topsoil is loamy and silty texture. The subsoil is coarse texture (sandy) and some may
be fine/heavy texture (clay). The soil organic matter level is low (1%). Although the surface water

is good in general, the water quality (untreated) is only suitable for agriculture. As a result of the
salinity in the water, it is a limited issue for farming. Only a few types of crops can be produced

as a result, and yields are poor.

3. Technical specifications, implementation activities, inputs, and costs

3.1 Implementation activities

1. The method was applied by building a fish pond that was divided into two parts: 1) a

nursery pond with a size of 0.16 ha and 2) a pond for growing fish with a size of 0.16 ha or more
per pond. The largest one is 0.56 ha.

2. The excavated soil was used as a pit with a 6 meter wide.

3. Adjust the acidity and alkalinity (pH) of the soil and water in the pond with manure and
lime to reduce the salinity level.

4. With 40,000-50,000 fishes, non-sexual tilapia offspring were purchased. For roughly 1-
2 months, they will be raised in nursery ponds.

5. Tilapia will be counted and placed into the pond when they reach around 2 inches in
length, with 2,000-3,000 fishes per pond.

6. Asexual tilapia begin to give birth after three months, resulting in a dense population.

The three-inch snapper was introduced into ponds to help remove tilapia juvenile fish. This method
will lower the cost of tilapia and snapper food.

7. In a year, there are two rounds of fish production. Tilapia (primary income) sells for 1.77
USD per kilogram, while Snapper sells for 5.30-5.90 USD per kilogram (extra income).

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