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.
Our Pacific Northwest Facility. Soak in the majestic Pacific Northwest as you focus on your recovery. We treat men and women ages 18+ who suffer from substance addiction. The Recovery Village at Ridgefield can guide you towards recovery, whether you need alcohol or drug rehab. Our peaceful campus rests 45 minutes north of Portland, OR in the mountains of Washington State, where patients enjoy resort-style amenities.