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Ammonia Volatilization from Urea Amended with Lignosulfonate and Phosphoroamide
Author(s) -
AlKanani T.,
MacKenzie A. F.,
Fyles J. W.,
O'Halloran I. P.,
Ghazala S.
Publication year - 1994
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/sssaj1994.03615995005800010037x
Subject(s) - urea , ammonia volatilization from urea , volatilisation , chemistry , fertilizer , ammonia , urease , ammonium , nitrogen , environmental chemistry , zoology , inorganic chemistry , biochemistry , organic chemistry , biology
Concern about losses of fertilizer N and pollution of the environment has stimulated research to find compounds that will reduce these problems by effectively inhibiting urease activity and nitrification. Laboratory studies were carried out to evaluate the effects of ammonium lignosulfonate (LS), thiophosphoric triamide (NBPT), and phenylphosphorodiamide (PPD) on NH 3 loss from urea fertilizer. We examined NH 3 losses from surface‐applied urea and from banded urea (2 cm below the soil surface) in samples of Ste. Rosalie clay soil (fine, mixed, nonacid, mesic Typic Humaquept) exposed to an initial water pressure of −0.01 MPa. Formulations of solution, physical dry blend, and tablets were used. Measurements of NH 3 volatilization were carried out using an air train system. Ammonia loss from surface‐applied unamended urea ranged from 16 to 21% of urea‐N applied. Amending urea with LS induced between 46 and 85% reduction in NH 3 losses compared with the unamended urea. For tablet and physical dry blend formulations, banding reduced NH 3 loss compared with tbe surface application. There were no significant differences in NH 3 losses between surface‐applied and banded treatments of solid fertilizer. Comparison of tbe effects of LS, NBPT, and PPD on NH 3 volatilization showed that both NBPT and PPD were more effective in reducing NH 3 loss than LS, but no significant differences between NBPT and PPD were found.