Proceedings for extracts obtaining and micronutrients determination in soil samples

Abstract

The deficiencies or micronutrients excesses in the soil can be diagnosed by several procedures. Among these, the chemical analysis of the soil is a prominence instrument, because it makes possible the previous evaluation of micronutrients available to the plants. In spite of many laboratories accomplish micronutrients chemical analyses in the soil, the lack of methodologies standardisation can commit the reliability of the results. Analytical procedures standardisation is an unquestionable need, when it intend to guarantee quality and credibility to the results. This study was carried out with the objective of comparing analytical procedures, seeking to contribute with new knowledge for definition and methodological standardisation of micronutrients chemical analyses of soil samples. The procedures of decantation for 16 hours and the filtration with filter paper Whatman 42, showed differents contents for iron, cooper, zinc and manganese in soil samples, don't having possibility for alternative use. The choice of one this procedures it should result in a standardisation to all the participant laboratories of quality control.