Many farmers have never made a full analysis of their soil. Nevertheless it’s important to carry an analysis at least once every 5 years, because it will indicate with precision what the characteristics of your soil are and highlight any deficiencies.
The application of fertilizer will then be done accordingly in the most economic way. Many different elements can be tested, but we recommend to analyze at least: N,P,K, pH, EC, Ca, Mg, OM.
In Thailand many laboratories and universities conduct this kind of test asking between THB 300 and THB 1,000.
More advanced analysis can be made such as micro nutrients, soil density, soil texture and micro organisms.