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Nitrogen release from urea with different coatings
Author(s) -
Campos Odirley R,
Mattiello Edson Marcio,
Cantarutti Reinaldo Bertola,
Vergütz Leonardus
Publication year - 2017
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8525
Subject(s) - coated urea , urea , urease , loam , chemistry , incubation , ammonia volatilization from urea , nitrogen , ammonia , soil water , zoology , nuclear chemistry , biochemistry , organic chemistry , biology , ecology
BACKGROUND Coatings or urease inhibitors are designed to reduce losses of ammonia [NH 3(g) ] from urea fertilizers. However, nitrogen (N) release and its effects on soil solution have not previously been evaluated under standardized conditions in soils. In this study, the urea fertilizers were incubated in chambers filled with sandy loam soil, adapted for the collection of NH 3(g) and soil solution by centrifugation. RESULTS In the fast‐release N fertilizers, around 93% and 100% of urea‐N applied was recovered within the first hours of incubation. In contrast, in the slow‐release N fertilizers, less than 40% of urea‐N applied, was recovered at 19 days of incubation. The maximum N release from the fertilizers followed the order: UP1 (106%) ≈ UNBPT (102%) ≈ urea (93%) > USP2 (57%) ≈ USP3 (57%) > USP4 (31%) ≈ USP5 (18%). NH 3(g) volatilization accounted for only 3% of the applied N in the slow‐release fertilizers, which corresponded to about 88% less than the NH 3(g) loss from prilled urea. CONCLUSION This study demonstrated distinct N release patterns, which changed the N dynamics in the soil. Some coatings effectively delayed urea release from granules and reduced NH 3(g) gas losses, while other were not efficient. © 2017 Society of Chemical Industry