Unformatted text preview: N Mineralization For a mineral soil that contains 5% organic matter
of vvhich 5% of the organic matter is nitrogen. an
annual mineralization rate of 2% would release: 2.000.000 lbs soil/afs x 0.05 x 0.05 x 0.02 = 100 lbs N/afs as Nitrogen N Mineralization Rate of mineralization depends on: - soil temperature
- soil aeration and moisture
- fertility These factors all affect microbial activity. and are not very
predictable. therefore N soil test typically are unreliable. Immobilization is the incorporation of inorganic forms of
nitrogen (NH 4*. NO;') into organic forms by soil
organisms and higher plants. Immobilization is the OPPOSITE of IlIi/I(‘I‘(l/i:(lfi()ll.
It takes mineral N and puts it back into proteins. Immobilization rates are a function of biological
activity. Nitrogen can be utilized by plants and other
organisms primarily in the NO; or NH 4+ forms. ...
View Full Document
- Spring '08