Abstract
This paper deal with a student-centered lesson on soil education in upper secondary biological science classes. In this paper the writer will report on the active problem-solving approach to the curriculum studying soil respiration. Students observed soil and its construction, and measured the quantity of soil respiration at each site in their field studies near the school. Most of students became interested in studying active soil. They learned that each soil had its own consistency, earth animals, plants, and was subject to its own artificial effects etc. They investigated the relationship between soil and respiration.
