ชั้นอินทรียวัตถุเป็นชั้นดินบนประกอบไปด้วยอินทรียวัตถุ ซึ่งส่วนใหญ่ได้มาจากองค์ประกอบของพืช ชั้น O จะพบเสมอในบริเวณป่าแต่จะไม่ค่อยพบในบริเวณทุ่งหญ้าหรือเขตเกษตรรรม
อินทรีย class object as chandin on consists of อินทรีย objects, most of which derived from the plant components are always found in the O layer in the forest, but is rarely found in the area of agricultural fields or Mead.
Organic matter on the soil layer is composed of organic matter. Which are mainly derived from plant floor O elements are always found in a wooded area, but it is rarely found in grasslands or agricultural field package.
The organic layers are composed of organic soil on Most of which is derived from elements of the plant, I O are always found in a wooded area, but is rarely found in the Manyara region grass or agricultural fair