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Fertilizers
N-(n-Butyl)thiophosphoric triamide
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N-(n-Butyl)thiophosphoric triamide

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N-(n-Butyl)thiophosphoric triamide
N-butylthiophosphoryltriamide.svg
Names
Other names
Agrotain
N-Butylphosphorothioic triamide
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.103.392
EC Number
  • 435-740-7
PubChem CID
UNII
  • InChI=1S/C4H14N3PS/c1-2-3-4-7-8(5,6)9/h2-4H2,1H3,(H5,5,6,7,9)
    Key: HEPPIYNOUFWEPP-UHFFFAOYSA-N
  • CCCCNP(=S)(N)N
Properties
C4H14N3PS
Molar mass 167.21 g·mol−1
Appearance white solid
Melting point 54 °C (129 °F; 327 K)
Hazards
GHS labelling:
GHS05: CorrosiveGHS08: Health hazard
Danger
H318, H361
P201, P202, P280, P281, P305+P351+P338, P308+P313, P310, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

N-(n-Butyl)thiophosphoric triamide (NBPT) is the organophosphorus compound with the formula SP(NH2)2(NHC4H9). A white solid, NBPT is an "enhanced efficiency fertilizer", intended to limit the release of nitrogen-containing gases following fertilization. Regarding its chemical structure, the molecule features tetrahedral phosphorus bonded to sulfur and three amido groups.

Use

NBPT functions as an inhibitor of the enzyme urease. Urease, pervasive in soil microorganisms, converts urea into ammonia, which is susceptible to volatilization if produced faster than it can utilized by plants. Approximately 0.5% by weight NBPT is mixed with the urea.

See also


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