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Unformatted text preview: n general, the N cycle processes
of fixation, mineralization and nitrification increase NH3
organic N When legumes are tilled into the soil, the N
stored in their roots is released and made
available to the next crop or lost to the
environment, depending on management.
In mixed legume-grass stands, the grass can
utilize N fixed by the legumes. If the stand has
25% or more legume, no additional N is needed. The
Cycle Mineralization is the process by which microbes
decompose organic N from manure, organic matter
and crop residues to ammonium. Because it is a
biological process, rates of mineralization vary with
soil temperature, moisture and the amount of
oxygen in the soil (aeration).
organic N NH3
ammonium Mineralization readily occurs in warm (68-95°F),
well-aerated and moist soils.
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This note was uploaded on 10/12/2012 for the course BIOTECH BT101 taught by Professor Gardy during the Spring '12 term at Indian Institute of Technology, Chennai.
- Spring '12