The Nitrogen Cycle. Ammonium (NH4+) and nitrate (NO3â) are the predominate inorganic forms of nitrogen in soils. Ammonium exists in exchangeable and nonexchangeable forms. Nitrite (NO2) and nitrous oxide (N2O) are present in soil in lesser quantities. Plants normally use nitrogen in only the ammonium and nitrate forms. Nitrite is actually toxic to plants. The nitrogen cycle (Figure 5.2) shows reactions that various inorganic nitrogen compounds undergo in soil.
Ridgefield, Washington. Ridgefield is a city in the pastoral, rolling-hills countryside of northern Clark County, Washington, in the United States. The population was 4,763 at the 2010 census.
203-431-2340 (Fax) The Town of Ridgefield Town of Ridgefield - Tax Assessor Office is located in the Ridgefield Town Hall building in Ridgefield, Connecticut. Town of Ridgefield is a locality in Fairfield County, Connecticut. Unlike many other areas where property taxes are collected on a county level, Town of Ridgefield has its own tax assessor's office.