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Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil

The vertical distribution of NH4+‐N following subsurface placement of different forms of urea was studied in incubated, undisturbed wetland soil cores. For prilled urea, supergranule urea, and prilled urea in mudballs placed at the 10‐cm depth, peak concentration of NH4+‐N was near the placement sit...

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Main Authors: Savant, N.K., De Datta, S.K.
Format: Journal Article
Language:Inglés
Published: Wiley 1980
Subjects:
movement
distribution
ammonium n
deep placement
urea
wetland rice soil
Online Access:https://hdl.handle.net/10568/167932
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author Savant, N.K.
De Datta, S.K.
author_browse De Datta, S.K.
Savant, N.K.
author_facet Savant, N.K.
De Datta, S.K.
author_sort Savant, N.K.
collection Repository of Agricultural Research Outputs (CGSpace)
description The vertical distribution of NH4+‐N following subsurface placement of different forms of urea was studied in incubated, undisturbed wetland soil cores. For prilled urea, supergranule urea, and prilled urea in mudballs placed at the 10‐cm depth, peak concentration of NH4+‐N was near the placement site and decreased with time, whereas after placement of sulfurcoated urea (SCU‐21) at the same depth, peak concentration of NH4+‐N increased over a period of 4 weeks. With time, the NH4+‐N tended to move downward more than upward from the placement sites, probably because of the mass flow of percolating water.In another experiment, the movement and spatial distribution of NH4+‐N were studied following application of 2‐g supergranules of urea (SGU) and sulfur‐coated supergranules of urea (SC‐SGU) at a depth of 10 cm in transplanted and cultivated wetland fallow plots. After 2 weeks, NH4+‐N concentration gradient for SGU was 1,850 to 32 µg N/cm3 wet soil, over a distance of 10–12 cm from the placement site. The corresponding gradient for SC‐SGU was 287 to 32 µg N/cm3 wet soil, over a distance of 5–7 cm from its placement site. For SGU in transplanted plots, the concentration gradient decreased steadily through 8 weeks, whereas for SC‐SGU it increased during the first 4 weeks and then decreased. The disappearance of NH4+‐N with time and distance from the site of application is attributed to diffusive transport or convective transport, or both, and root‐sink effect. The general movement of NH4+‐N was downward > lateral > upward. The apparent benefits of deep placement of urea in a wetland rice soil are discussed.
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language Inglés
publishDate 1980
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spelling CGSpace1679322025-05-14T10:39:58Z Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil Savant, N.K. De Datta, S.K. movement distribution ammonium n deep placement urea wetland rice soil The vertical distribution of NH4+‐N following subsurface placement of different forms of urea was studied in incubated, undisturbed wetland soil cores. For prilled urea, supergranule urea, and prilled urea in mudballs placed at the 10‐cm depth, peak concentration of NH4+‐N was near the placement site and decreased with time, whereas after placement of sulfurcoated urea (SCU‐21) at the same depth, peak concentration of NH4+‐N increased over a period of 4 weeks. With time, the NH4+‐N tended to move downward more than upward from the placement sites, probably because of the mass flow of percolating water.In another experiment, the movement and spatial distribution of NH4+‐N were studied following application of 2‐g supergranules of urea (SGU) and sulfur‐coated supergranules of urea (SC‐SGU) at a depth of 10 cm in transplanted and cultivated wetland fallow plots. After 2 weeks, NH4+‐N concentration gradient for SGU was 1,850 to 32 µg N/cm3 wet soil, over a distance of 10–12 cm from the placement site. The corresponding gradient for SC‐SGU was 287 to 32 µg N/cm3 wet soil, over a distance of 5–7 cm from its placement site. For SGU in transplanted plots, the concentration gradient decreased steadily through 8 weeks, whereas for SC‐SGU it increased during the first 4 weeks and then decreased. The disappearance of NH4+‐N with time and distance from the site of application is attributed to diffusive transport or convective transport, or both, and root‐sink effect. The general movement of NH4+‐N was downward > lateral > upward. The apparent benefits of deep placement of urea in a wetland rice soil are discussed. 1980-05 2024-12-19T12:57:50Z 2024-12-19T12:57:50Z Journal Article https://hdl.handle.net/10568/167932 en Wiley Savant, N. K.; De Datta, S. K. 1980. Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil. Soil Science Soc of Amer J, Volume 44 no. 3 p. 559-565
spellingShingle movement
distribution
ammonium n
deep placement
urea
wetland rice soil
Savant, N.K.
De Datta, S.K.
Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil
title Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil
title_full Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil
title_fullStr Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil
title_full_unstemmed Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil
title_short Movement and Distribution of Ammonium-N Following Deep Placement of Urea in a Wetland Rice Soil
title_sort movement and distribution of ammonium n following deep placement of urea in a wetland rice soil
topic movement
distribution
ammonium n
deep placement
urea
wetland rice soil
url https://hdl.handle.net/10568/167932
work_keys_str_mv AT savantnk movementanddistributionofammoniumnfollowingdeepplacementofureainawetlandricesoil
AT dedattask movementanddistributionofammoniumnfollowingdeepplacementofureainawetlandricesoil

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