Results 151 to 160 of about 13,717,290 (175)
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Journal of Agricultural and Food Chemistry, 1991
A method was developed to analyze the urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT) and its metabolites. The method consists of separation of the compounds via reverse-phase liquid chromatography followed by postcolumn hydrolysis using nitric acid and formation of fluorescent products using o-phthalaldehyde.
Elizabeth A. Douglass +1 more
exaly +2 more sources
A method was developed to analyze the urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT) and its metabolites. The method consists of separation of the compounds via reverse-phase liquid chromatography followed by postcolumn hydrolysis using nitric acid and formation of fluorescent products using o-phthalaldehyde.
Elizabeth A. Douglass +1 more
exaly +2 more sources
Journal of Plant Nutrition and Soil Science, 2016
AbstractCharcoal‐based amendments have a potential use in controlling NH3 volatilization from urea fertilization, owing to a high cation‐exchange capacity (CEC) that enhances the retention of NH $ _4^+ $. An incubation study was conducted to evaluate the potential of oxidized charcoal (OCh) for controlling soil transformations of urea‐N, in comparison ...
Gelton G. F. Guimarães +4 more
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AbstractCharcoal‐based amendments have a potential use in controlling NH3 volatilization from urea fertilization, owing to a high cation‐exchange capacity (CEC) that enhances the retention of NH $ _4^+ $. An incubation study was conducted to evaluate the potential of oxidized charcoal (OCh) for controlling soil transformations of urea‐N, in comparison ...
Gelton G. F. Guimarães +4 more
openaire +1 more source
Science of the Total Environment, 2018
The urease inhibitor, N-(n-butyl) thiophosphoric triamide (NBPT), has been proposed to reduce synthetic fertilizer-N losses, including nitrous oxide (N2O) emissions from agricultural soils. However, the response of N2O emission to NBPT amendment is inconsistent across soils and associated microbial mechanisms remain largely unknown. Here we performed a
Guochao Yan, Yongchao Liang, Yuhua Zhao
exaly +3 more sources
The urease inhibitor, N-(n-butyl) thiophosphoric triamide (NBPT), has been proposed to reduce synthetic fertilizer-N losses, including nitrous oxide (N2O) emissions from agricultural soils. However, the response of N2O emission to NBPT amendment is inconsistent across soils and associated microbial mechanisms remain largely unknown. Here we performed a
Guochao Yan, Yongchao Liang, Yuhua Zhao
exaly +3 more sources
Fertilizer Research, 1988
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.
B. H. Byrnes, A. Amberger
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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.
B. H. Byrnes, A. Amberger
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Soil Biology and Biochemistry, 1990
Abstract HPLC-purified N-(n-butyl)thiophosphoric triamide (NBPT) had no delectable urease inhibitory activity when tested with jack bean urease. However, considerable inhibition was associated with soil extracts when NBPT had been exposed in the soils for several hours.
G.L. Creason +3 more
exaly +2 more sources
Abstract HPLC-purified N-(n-butyl)thiophosphoric triamide (NBPT) had no delectable urease inhibitory activity when tested with jack bean urease. However, considerable inhibition was associated with soil extracts when NBPT had been exposed in the soils for several hours.
G.L. Creason +3 more
exaly +2 more sources
Water, Air, and Soil Pollution, 1999
Application of soluble forms of nitrogen (N) fertilizers to citrus trees in sandy soils of central Florida may cause leaching of NO3− below the rooting depth. A leaching column study was conducted to evaluate the leaching of urea, NH4+ and NO3− forms of N from calcium nitrate, urea, and urease inhibitor coated urea (Agrotain: N-(-n butyl ...
O. Prakash, A. K. Alva, S. Paramasivam
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Application of soluble forms of nitrogen (N) fertilizers to citrus trees in sandy soils of central Florida may cause leaching of NO3− below the rooting depth. A leaching column study was conducted to evaluate the leaching of urea, NH4+ and NO3− forms of N from calcium nitrate, urea, and urease inhibitor coated urea (Agrotain: N-(-n butyl ...
O. Prakash, A. K. Alva, S. Paramasivam
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Soil Biology and Biochemistry, 1990
Abstract The effect of the urease inhibitor N-(n-butyl) thiophosphoric triamide (nBTPT) on urea hydrolysis and NH3 volatilization was studied in laboratory experiments. At ambient laboratory temperatures. NH3 volatilization rates were shown to be significantly reduced by an nBTPT concentration in urea as low as 0.005% (w/w).
G. Carmona +2 more
exaly +2 more sources
Abstract The effect of the urease inhibitor N-(n-butyl) thiophosphoric triamide (nBTPT) on urea hydrolysis and NH3 volatilization was studied in laboratory experiments. At ambient laboratory temperatures. NH3 volatilization rates were shown to be significantly reduced by an nBTPT concentration in urea as low as 0.005% (w/w).
G. Carmona +2 more
exaly +2 more sources
Plant and Soil, 1994
Three field experiments were undertaken concurrently at one site to evaluate a range of surface-applied nBTPT-amended urea products (0.01, 0.05, 0.1, 0.25 and 0.5% nBTPT w/w) on NH3 volatilization, grass yield and 15N recovery in the plant-soil system. Each experiment was repeated on five separate occasions over the 1992 growing season to cover a range
Catherine J. Watson +5 more
openaire +1 more source
Three field experiments were undertaken concurrently at one site to evaluate a range of surface-applied nBTPT-amended urea products (0.01, 0.05, 0.1, 0.25 and 0.5% nBTPT w/w) on NH3 volatilization, grass yield and 15N recovery in the plant-soil system. Each experiment was repeated on five separate occasions over the 1992 growing season to cover a range
Catherine J. Watson +5 more
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Zeitschrift für Pflanzenernährung und Bodenkunde, 1989
AbstractUrea was split applied to transplanted rice in a greenhouse experiment with two‐thirds applied as labeled15N urea at 15 days after transplanting (DAT) and one‐third (not labeled) at 42 DAT to determine the effect of the urease inhibitors phenyl phosphorodiamidate (PPDA) and N‐(n‐butyl) thiophosphoric triamide (NBPT) on urea hydrolysis, plant ...
Bernard H. Byrnes +2 more
openaire +1 more source
AbstractUrea was split applied to transplanted rice in a greenhouse experiment with two‐thirds applied as labeled15N urea at 15 days after transplanting (DAT) and one‐third (not labeled) at 42 DAT to determine the effect of the urease inhibitors phenyl phosphorodiamidate (PPDA) and N‐(n‐butyl) thiophosphoric triamide (NBPT) on urea hydrolysis, plant ...
Bernard H. Byrnes +2 more
openaire +1 more source
Bioresource Technology
Ammonia volatilization from livestock manure is driven by urease-catalyzed urea hydrolysis, strongly influenced by temperature and pH. This study assessed the inhibition performance of phenyl phosphorodiamidate (PPDA) and N-(n-butyl)thiophosphoric triamide (NBPT) under conditions (10-35°C, pH 6-10) representative of manure storage. PPDA achieved strong
Yun-Ju, Jeon +2 more
openaire +2 more sources
Ammonia volatilization from livestock manure is driven by urease-catalyzed urea hydrolysis, strongly influenced by temperature and pH. This study assessed the inhibition performance of phenyl phosphorodiamidate (PPDA) and N-(n-butyl)thiophosphoric triamide (NBPT) under conditions (10-35°C, pH 6-10) representative of manure storage. PPDA achieved strong
Yun-Ju, Jeon +2 more
openaire +2 more sources