Acidification and reclamation of acid sulfate soil fish ponds in Thailand
1986
Lin, C.K. (Michigan Univ., Ann Arbor, Michigan (USA). Great Lakes and Marine Water Center)
An experiment was conducted to examine the chemical characteristics of the effects of fertilization on water quality and biological productivity in fishponds built in acid sulfate soil region of Thailand. The acid soil acidified the overlying pond water rapidly to pH less than 4, but its acidification effect was reduced remarkably by repeated changing of the pond water with alkaline source water. Further improvement of the pond water was done by liming and enriching the ponds with inorganic and organic fertilizer. The pH in ponds receiving inorganic fertilizer fluctuated widely necessitating repeated liming. Production of food organisms (phyto-and zooplankton) was relatively poor. Fish yield (Oreochromis niloticus and Puntius gonionotus stocked at a density of 3 fish/square meter) in five months was only 426 kg/ha. In comparison, the pH in ponds fertilized with chicken manure stabilized in the alkaline range and fluctuated little after initial liming. Relatively high plankton productions were achieved and fish yield was 1,528 kg/ha. Methods for reclaiming the acid soils for productive fishponds are recommended.
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