Holiday Weather. Less rain and more sun is the main theme during the third month of the year, and a very popular time to visit Madrid, as the fleeting spring season begins. You can expect an average temperature of around 10Â°C during March, which actually reaches a very pleasant 16Â°C on a good day, and goes down to an average low of 4Â°C in th...
The nitrogen cycle is the process by which nitrogen is converted from organic to inorganic forms; many steps are performed by microbes. Learning Objective. Key Points. Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation.
Processes in the Nitrogen Cycle. 1  Fixation - Fixation is the first step in the process of making nitrogen usable by plants. Here bacteria change nitrogen into ammonium. 2  Nitrification - This is the process by which ammonium gets changed into nitrates by bacteria. Nitrates are what the plants can then absorb.