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Evaluation of Ureaform Fertilizer Using Nitrogen‐15‐Labeled Materials in Sandy Soils
Author(s) -
Brown M. A.,
Volk G. M.
Publication year - 1966
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1966.03615995003000020037x
Subject(s) - lysimeter , ammonium , nitrate , ammonium nitrate , soil water , fertilizer , chemistry , nitrogen , incubation , agronomy , environmental chemistry , environmental science , soil science , biology , biochemistry , organic chemistry
A quantitative account of labeled ureaform and ammonium nitrate fertilizer N was made in outdoor lysimeters, greenhouse pots, and laboratory incubation vessels. A major portion of the labeled fertilizer N applied to lysimeter and greenhouse pots was recovered by crops. A greater proportion of labeled ammonium nitrate N was recovered in the plants than labeled ureaform N. However, more labeled N was found in the soil after 1 year when ureaform was the source. As a result, there were no differences in total recovery of labeled N in plants plus soil between sources. Approximately half of the N in the ureaform used in these studies was in a state of availability approaching that of ammonium nitrate. Extended availability of ureaform N over ammonium nitrate N was only apparent at the high rate of ureaform application. Approximately 15 to 20% of the ureaform material remained apparently unchanged in the soil after 1 year. Unaccounted for N is thought to have been lost as a gas after it entered the organic N complex of the soil, since similar total recoveries were obtained for ammonium, nitrate, and ureaform N. Under anaerobic conditions significant quantities of N were lost from soils incubated with ureaform as well as from soils incubated with ammonium nitrate.