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).
Factors that Determine the Quantity of Nitrogen Supplied by the Soil. 1  The quantity of nitrogen released from the soil organic matter. 2  The quantity of nitrogen released by decomposition of residues of the previous crop. 3  Any nitrogen supplied by previous applications of organic waste. 4  Any nitrogen carried over from previous fertilizer applications.