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.[1] Regarding its chemical structure, the molecule features tetrahedral phosphorus bonded to sulfur and three amido groups.
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| Other names
Agrotain
N-Butylphosphorothioic triamide | |
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3D model (JSmol)
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| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.103.392 |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| C4H14N3PS | |
| Molar mass | 167.21 g·mol−1 |
| Appearance | white solid |
| Melting point | 54 °C (129 °F; 327 K) |
| Hazards | |
| GHS labelling: | |
 
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| 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).
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Use edit
NBPT functions as an inhibitor of the enzyme urease.[2] Urease, pervasive in soil microorganisms, converts urea into ammonia, which is susceptible to volatilization if produced faster than it can be utilized by plants. Approximately 0.5% by weight NBPT is mixed with the urea.[3]
See also edit
- Phenyl phosphorodiamidate, another urease inhibitor
References edit
- ^ Rose, Terry J.; Wood, Rachel H.; Rose, Michael T.; Van Zwieten, Lukas (2018). "A re-evaluation of the agronomic effectiveness of the nitrification inhibitors DCD and DMPP and the Urease Inhibitor NBPT". Agriculture, Ecosystems & Environment. 252: 69–73. doi:10.1016/j.agee.2017.10.008.
- ^ Pan, Baobao; Lam, Shu Kee; Mosier, Arvin; Luo, Yiqi; Chen, Deli (2016). "Ammonia Volatilization from Synthetic Fertilizers and its Mitigation Strategies: A Global Synthesis". Agriculture, Ecosystems & Environment. 232: 283–289. doi:10.1016/j.agee.2016.08.019.
- ^ Zaman, M.; Zaman, S.; Quin, B.F; Kurepin, L.V; Shaheen, S.; Nawaz, S.; Dawar, K.M (2014). "Improving Pasture Growth and Urea Efficiency Using N inhibitor, Molybdenum and Elemental Sulphur". Journal of Soil Science and Plant Nutrition. doi:10.4067/S0718-95162014005000020.