Nuku’alofa — Preliminary research by students at the Tonga National University (TNU) has found signs that intensive farming practices may be increasing soil acidity across parts of Tongatapu, raising concerns about crop productivity and long-term land health.
Second-year students from the School of Agriculture have been conducting the study to examine how repeated cultivation affects soil pH levels.
Their findings suggest that heavily farmed areas are beginning to show measurable changes in soil chemistry, with acidity levels rising in some locations.
The research team collected soil samples from every district of Tongatapu, aiming to build a comprehensive picture of soil conditions across the island.
By covering a wide geographic area, the students sought to ensure that their findings reflect broader trends rather than isolated cases.
The students hope their research will help raise awareness among farmers about the importance of sustainable cultivation practices, such as crop rotation, fallowing, and soil management techniques that maintain balanced pH levels.
