Enhancing Water Quality for Agriculture and Aquaculture in the Khok Nong Na Area at the Phitsanulok Community Development Learning Center

Abstract

The objectives of this research were (1) to assess water quality for agriculture and aquaculture and (2) to improve water quality using experimental action research. This was achieved by adding
cow dung to a C-shaped pond once a week, while an L-shaped pond served as a control and received
no cow dung. The results showed that the pH of the C-shaped pond decreased from 9.24 to 8.48, with
an average value of 8.77—falling within the natural pH range (6.5–8.5) suitable for agriculture
and aquaculture. Total dissolved solids (TDS) increased from 258 to 413 ppm, with an average of
351 ppm. Salinity changed from 0.02 to 0.03 ppt, with an average of 0.03 ppt, indicating a slight increase in salinity in freshwater. Electrical conductivity (EC) increased from 520 to 885 µmohs/cm, with an average of 730.2 µmohs/cm. In conclusion, the addition of cow dung effectively reduced the high alkalinity of
the C-shaped pond, improving its suitability for aquaculture and plant growth