KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMES

With black soil (Pachic Udic Argiboroll) of Northeastern China as the test object, an incubation test was conducted to investigate the effects of urease inhibitors, hydroquinone (HQ), phenyl phosphorodiamidate (PPD) and N-(n-Butyl) thiophosphoric triamide (NBPT), on the kinetic characteristics of so...

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Autores principales:	Juan,Y.H, Chen,L.J, Wu,Z.J, Wang,R
Lenguaje:	English
Publicado:	Sociedad Chilena de la Ciencia del Suelo 2009
Materias:	kinetic parameters mixed inhibition moisture regime soil urease
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000200004
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spelling	oai:scielo:S0718-279120090002000042009-09-09KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMESJuan,Y.HChen,L.JWu,Z.JWang,R kinetic parameters mixed inhibition moisture regime soil urease With black soil (Pachic Udic Argiboroll) of Northeastern China as the test object, an incubation test was conducted to investigate the effects of urease inhibitors, hydroquinone (HQ), phenyl phosphorodiamidate (PPD) and N-(n-Butyl) thiophosphoric triamide (NBPT), on the kinetic characteristics of soil urease under normal moisture and waterlogged conditions, aimed to study the changes of catalytic potential of soil urease and the inhibition mechanisms. The results showed that test urease exhibited typical Michaelis-Menten kinetic behaviors, and all test inhibitors increased the Km and decreased the Vmax of soil urease, behaving as mixed inhibitors to soil urease. Under both normal and waterlogged conditions, compared with HQ, PPD and NBPT made Km increase and Vmax and Vmax and Vmax/Km decrease more greatly, and the duration of these effects was longer (ca. 30 days vs. 10 days). Under water-logging, PPD made more increment of Km and more decrement of Vmax and Vmax/Km than NBPT, compared with that under normal soil moisture condition, suggesting that NBPT was more available under normal soil moisture condition, while PPD was promising under water-logging condition. To apply urease inhibitors and to control soil moisture condition could be a feasible way in increasing fertilizer N use efficiency affected by soil urease.info:eu-repo/semantics/openAccessSociedad Chilena de la Ciencia del SueloRevista de la ciencia del suelo y nutrición vegetal v.9 n.2 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000200004en10.4067/S0718-27912009000200004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	kinetic parameters mixed inhibition moisture regime soil urease
spellingShingle	kinetic parameters mixed inhibition moisture regime soil urease Juan,Y.H Chen,L.J Wu,Z.J Wang,R KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMES
description	With black soil (Pachic Udic Argiboroll) of Northeastern China as the test object, an incubation test was conducted to investigate the effects of urease inhibitors, hydroquinone (HQ), phenyl phosphorodiamidate (PPD) and N-(n-Butyl) thiophosphoric triamide (NBPT), on the kinetic characteristics of soil urease under normal moisture and waterlogged conditions, aimed to study the changes of catalytic potential of soil urease and the inhibition mechanisms. The results showed that test urease exhibited typical Michaelis-Menten kinetic behaviors, and all test inhibitors increased the Km and decreased the Vmax of soil urease, behaving as mixed inhibitors to soil urease. Under both normal and waterlogged conditions, compared with HQ, PPD and NBPT made Km increase and Vmax and Vmax and Vmax/Km decrease more greatly, and the duration of these effects was longer (ca. 30 days vs. 10 days). Under water-logging, PPD made more increment of Km and more decrement of Vmax and Vmax/Km than NBPT, compared with that under normal soil moisture condition, suggesting that NBPT was more available under normal soil moisture condition, while PPD was promising under water-logging condition. To apply urease inhibitors and to control soil moisture condition could be a feasible way in increasing fertilizer N use efficiency affected by soil urease.
author	Juan,Y.H Chen,L.J Wu,Z.J Wang,R
author_facet	Juan,Y.H Chen,L.J Wu,Z.J Wang,R
author_sort	Juan,Y.H
title	KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMES
title_short	KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMES
title_full	KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMES
title_fullStr	KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMES
title_full_unstemmed	KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMES
title_sort	kinetics of soil urease affected by urease inhibitors at contrasting moisture regimes
publisher	Sociedad Chilena de la Ciencia del Suelo
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000200004
work_keys_str_mv	AT juanyh kineticsofsoilureaseaffectedbyureaseinhibitorsatcontrastingmoistureregimes AT chenlj kineticsofsoilureaseaffectedbyureaseinhibitorsatcontrastingmoistureregimes AT wuzj kineticsofsoilureaseaffectedbyureaseinhibitorsatcontrastingmoistureregimes AT wangr kineticsofsoilureaseaffectedbyureaseinhibitorsatcontrastingmoistureregimes
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KINETICS OF SOIL UREASE AFFECTED BY UREASE INHIBITORS AT CONTRASTING MOISTURE REGIMES

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