The relationship between the logarithm of nitrification intensity and moisture (expressed as pF) did not have an ideal linear course in structural soils in which pores of a certain size predominated. When increasing the incubation moisture it could be observed that the intensity of nitrification decreases at pF 3.5-4.4 and increases again on further increasing the incubation moisture. The detected anomaly was observed when applying moistures corresponding to peaks of derivation pF-curves. It can be assumed that the relationship between the intensity of nitrification and moisture is modified by soil microstructure; therefore, this relationship was studied in more detail in the present communication.

• MeSH
• Bacteria metabolismus   MeSH
• dusičnany metabolismus   MeSH
• dusitany metabolismus   MeSH
• půda analýza   MeSH
• půdní mikrobiologie * MeSH
• velikost částic MeSH
• voda analýza   MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• dusičnany MeSH
• dusitany MeSH
• půda MeSH
• voda MeSH

The effect of size of structural aggregates on the intensity of nitrification and nitrogenase (nitrogen: acetylene oxidoreductase) activity was investigated in three soils. In two of them the nitrogenase activity was limited by addition of glucose. Aggregates of a larger diameter (2-4 mm) exhibited a considerably higher nitrogenase activity than those with a diameter smaller than 2 mm. This effect was even more pronounced when the soil samples were repeatedly intensively aerated. On the contrary, smaller aggregates (0.5-2 mm) exhibited more intensive nitrification.

• MeSH
• acetylen metabolismus   MeSH
• Bacteria metabolismus   MeSH
• dusičnany metabolismus   MeSH
• fixace dusíku MeSH
• nitrogenasa metabolismus   MeSH
• oxidace-redukce MeSH
• půda MeSH
• půdní mikrobiologie * MeSH
• velikost částic MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• acetylen MeSH
• dusičnany MeSH
• nitrogenasa MeSH
• půda MeSH