Nitrogen mineralization in histosols of the everglades agricultural area

• Published in: Communications in soil science and plant analysis Vol. 28; no. 1/2; pp. 73 - 87
• Main Authors: Hanlon, E.A. (University of Florida, Gainesville, FL.), Anderson, D.L, Diaz, O.A
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 1997; Taylor & Francis
• Subjects: Agronomy. Soil science and plant productions; AZOTE; Biological and medical sciences; Chemical, physicochemical, biochemical and biological properties; COMPOSE DE L'AMMONIUM; COMPOSE ORGANOAZOTE; COMPUESTO ORGANICO DEL NITROGENO; COMPUESTOS DE AMONIO; Earth sciences; Earth, ocean, space; Exact sciences and technology; FLORIDA; FLORIDE; Fundamental and applied biological sciences. Psychology; Geochemistry; HISTOSOL; HISTOSOLES; INONDATION; INUNDACION; LESSIVAGE DU SOL; LIXIVIACION; MINERALISATION; MINERALIZACION; NITRATE; NITRATOS; NITROGENO; Organic matter; PERDIDAS; PERTE; Physics, chemistry, biochemistry and biology of agricultural and forest soils; REGIME HYDRIQUE DU SOL; REGIMEN HIDRICO DEL SUELO; Soil and rock geochemistry; Soil science; Soils; Surficial geology; Florida; United States; North America; America; USA, Florida, Everglades Agricultural Area; Soil chemistry; Subtropical zone; Laboratory study; Ammonium; Organic matter; Cultivated soil; Submersion; Nitrates; Natural soil; Nitrogen; Inorganic element; Biological activity; Biogeochemistry; Geographical division; Nitrogen cycle; Agricultural region; FARMLAND; Intermittent; Mineralization; Water regime; Rural area; Histosols; Wetland
• ISSN: 0010-3624; 1532-2416
• DOI: 10.1080/00103629709369773

A long-term soil incubation and column nutrient leaching study was conducted to determine nitrogen (N)-mineralization rates of selected Florida Histosols with drained and intermittent-flooded conditions. Five surface soils from the Everglades Agricultural Area (EAA) were packed in columns (5-cm i.d. containing the 0- to 15-cm depth of each soil) and leached with 0.01M CaCl2 followed by distilled water every 25 d for 1 yr. Drained columns were treated with a minus-nitrogen-phosphorus (NP) solution followed by applying -0.97 MPa tension to remove excess solution. Flooded columns received the same minus-NP solution, but were flooded to a depth of 3 cm. Both treatments were incubated for 25-d periods, solution sampled, and treatments reapplied. Because flooding conditions could not be maintained during the sampling period, this treatment is referred to as intermittent flooded. The ammonium-nitrogen (NH4(+)-N) released from drained soils accounted for less than 6% of the total soluble N released from all soils, compared to more than 30% released from flooded soils. There were no differences in the amounts of soluble organic N from drained and intermittent flooded soils. Total soluble N from the surface 15-cm of drained soils ranged from 217 to 509 kg.ha-1 yr-1, with 50 to 67% released as nitrate-nitrogen (NO3(-)-N). In contrast, total soluble N released from flooded soils ranged from 168 to 345 kg ha-1 yr-1, with less than 3% released as NO3(-)-N