Study on Sediment Quality Dynamic in Pacific White Shrimp ( Litopenaeus vannamei ) Pond fishery science and technology Trang. Found that the average acidity - alkalinity of the soil in the pond. 1 and 2 with a mean of 7.49 and 7.49 and organic matter in the soil, wells 1 and 2 averaged 6.60% and 6.65%, and statistical analysis. No difference was statistically significant. (P