Posted 1/13/2021 10:58 (#8747776 - in reply to #8747760) Subject: RE: No-till saves nitrogen costs
It sounds like they convert existing N, they are not pulling it from the air and creating new soil based N? So it is still using the closed loop of stored soil N?
The genus Nitrobacter is widely distributed in both aquatic and terrestrial environments. Nitrifying bacteria have an optimum growth between 25 and 30 °C, and cannot survive past the upper limit of 49 °C or the lower limit of 0 °C. This limits their distribution even though they can be found in a wide variety of habitats. Cells in the genus Nitrobacter have an optimum pH for growth between 7.3 and 7.5, and will die at temperatures exceeding 120 °F (49 °C) or below 32 °F (0 °C). According to Grundmann, Nitrobacter seem to grow optimally at 38 °C and at a pH of 7.9, but Holt states that Nitrobacter grow optimally at 28 °C and within a pH range of 5.8 to 8.5, although they have a pH optima between 7.6 and 7.8.
The primary ecological role of members of the genus Nitrobacter is to oxidize nitrite to nitrate, a primary source on inorganic nitrogen for plants. Members of the genus Nitrospira also play an important role as nitrite oxidizers. This role is also essential in aquaponics. Since all members in the genus Nitrobacter are obligate aerobes, oxygen along with phosphorus tend to be factors that limit their capability to perform nitrogen fixation. One of the major impacts of Nitrosomonas and Nitrobacter in both oceanic and terrestrial ecosystems is on the process of eutrophication.