In compacted and waterlogged soils ??fixation by nodules is probably limited by availability of ??
The Major natural sources of atmospheric methane include enteric fermentation in ruminants and some insects, and the anaerobic decomposition of organic matter in waterlogged soils.
A sticky, bluish - gray subsurface layer of clay found in some waterlogged soils.
Some savannas occur on wet, waterlogged soils; others on dry, sandy, well-drained soils.
