Construction managers, also called general contractors or project managers, typically do the following: 1  Prepare and negotiate cost estimates, budgets, and work timetables. 2  Select appropriate construction methods and strategies. 3  Interpret and explain contracts and technical information to workers and other professionals.
Denitrification is the process that converts nitrate to nitrogen gas, thus removing bioavailable nitrogen and returning it to the atmosphere. Dinitrogen gas (N2) is the ultimate end product of denitrification, but other intermediate gaseous forms of nitrogen exist (Figure 7).
Ammonium nitrogen tends to result in the acidification of the soil because when ammonium is taken up, the plant roots release hydrogen ions into the soil solution. Also, as ammonium is turned into nitrate through nitrification, all of the hydrogen ions are replaced by oxygen.