Abstract
The compound N-(n-butyl) thiophosphoric triamide (NBPT) was found to be a more effective ureas inhibitor than phenyl phosphorodiamidate (PPDA) in flooded soils when compared at concentrations of from 0.5 to 5% of the weight of urea. It allowed essentially no ammoniacal-N to acumulate in the floodwater when added at 0.5% of the weight of urea. The fate of urea was also determined in a flooded, unplanted soil with NBPT used as an inhibitor at a rate of 2% by weight of urea. At 41 days, fertilizer-N loss without the inhibitor was 73.4%, whereas with NBPT, 34.7% of the fertilizer was lost, presumably all by denitrification. With NBPT, urea hydrolysis was not inhibited below a 1 cm depth in the soil and most of the N (35.0%) accumulated as exchangeable NH +4 -N. Except for 15.0% of the fertilized accumulated as organic-N on the soil surface layer, immobilized N accounted for only an additional 7.0% in the soil at 22 days. Although the N saved from NH3 volatilization loss obviously is eligible for denitrification losses, denitrification apparently was not enhanced to an appreciable extent by use of the inhibitor in that total losses were 15.7% at 22 days.
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References
Austin ER, Bradford TJ and Lupin MS (1984) High-performance liquid chromatographic determination and hydrolysis studies of phenyl phosphorodiamidate, a urease inhibitor. J Agr and Food Chem 32:1090–1096
Bouldin DR (1986) The chemistry and biology of flooded soils in relation to the nitrogen economy in rice fields. Fert Res 9:1–14
Bremner JM and Chai HS (1986) Evaluation of N-butyl phosphorothioic triamide for retardation of urea hydrolysis in soils. Commun in Soil Sci Plant Anal 17:337–351
Buresh RJ, Austin ER and Craswell ET (1982) Analytical methods in15N research. Fert Res 3:37–62
Byrnes BH, Savant NK and Craswell ET (1983) Effect of a urease inhibitor phenyl phosphorodiamidate (PPD) on the efficiency of urea applied to rice. Soil Sci Sco Am J 47:270–274
Byrnes BH, Vilsmeier K, Austin ER and Amberger A (in press) The degradation of the urease inhibitor phenyl phosphorodiamidate (PPDA) in solutions and floodwaters. J of Agr and Food Chem (accepted)
Byrnes BH, Gutser R and Amberger R (in press) Greenhouse study of the urease inhibitors phenyl phosphorodiamidate and N-(n-butyl) thiophosphoric triamide on the efficiency of urea applied to flooded rice. Z für Pflanzenernährung u Bodenk (submitted)
Castillo EG (1985) The effect of phenyl phosphorodiamidate (PPD) urease inhibitor on floodwater characteristics and15N recovery of urea in lowland rice. M.S. Thesis, University of the Philippines, Los Baños
Craswell ET and Vlek PLG (1979) Greenhouse evaluation of nitrogen fertilizers for rice. Soil Sci Soc Am J 44:1184–1188
Fillery IRP, De Datta SK and Craswell ET (1986) Effect of phenyl phosphorodiamidate on the fate of urea applied to wetland rice fields. Fert Res 9:251–263
Fillery IRP and Vlek PLG (1986) Reappraisal of the significance of ammonia volatilization as an N loss mechanism in flooded rice fields. Fert Res 9:79–98
Kole JF, Swerdloff MD, Rogie MM, Hendrickson LL and Van Der Puy M (1985) N-aliphatic and N, N-aliphatic phosphoric triamide urease inhibitors and urease inhibited urea based fertilizer compositions. U.S. Patent 4,530,714
Martens DA and Bremner JM (1984) Urea hydrolysis in soils: Factors influencing the effectiveness of phenyl phosphorodiamidate as a retardant. Soil Biol Biochem 16:515–519
Martinez A and Diamond RB (1984) Nitrogen use in world crop production. In Hauck RD, ed. Nitrogen in crop production, p. 3–21. Am Soc of Agron, Madison, Wisconsin
Matzel W, Lippold H and Heber R (1979) Nitrogen uptake and balance of the fertilizer urea, urea with inhibitor, and ammonium nitrate applied to spring wheat at stem elongation growth stage. In Isotopes and radiation in research on soil-plant relationships; Proceedings of an international symposium, p. 67–82. Colombo, Sri Lanka, Dec. 11-15, 1978, IAEA, Vienna
Schlegel AJ, Nelson DW and Sommers LE (1986) Field evaluation of urease inhibitors for corn production. Agron J 78:1007–1012
Simpson JR, Freney JR, Muirhead WA and Leuning R (1985) Effects of phenyl phosphorodiamidate and dicyandiamide on nitrogen loss from flooded rice. Soil Sci Soc Am J 49:1426–1431
Stumpe JM, Christianson CB and Buresh RJ (1985) An aluminum block digestion procedure for determination of total N in soils containing15N. Commun in Soil Sci Plant Anal 16:1–14
Technicon (1973) Ammonia in water and wastewater. Technicon Industrial Method No. 98-70W. Technicon, Tarrytown, New York
Technicon (1974) Urea nitrogen. Technicon method No. 40001 FD4. Technicon Corporation, Tarrytown, New York
Vlek PLG, Stumpe JM and Byrnes BH (1980) Urease activity and inhibition in flooded soils systems. Fert Res 1:191–202
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Byrnes, B.H., Amberger, A. Fate of broadcast urea in a flooded soil when treated with N-(n-butyl) thiophosphoric triamide, a urease inhibitor. Fertilizer Research 18, 221–231 (1988). https://doi.org/10.1007/BF01049572
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DOI: https://doi.org/10.1007/BF01049572