Transport of Urea in Flooded Soil Profiles as Affected by Water Percolation Rates and NBPT

Li, Ma; Hongprayoon, C.; Lindau, C. W.; Selim, H. M.

doi:10.1097/00010694-199508000-00003

Cited by 5 publications

(2 citation statements)

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“…2 and 8). This, combined with the preservation of N in the moderately soluble form of urea, may result in increased leaching as urea-N or NO 3 -N (Dawar et al 2011;Ma et al 1995) and/or denitrification (NO 3 -N) loss of N in conditions where soil moisture content is high.…”

Section: Urease Inhibitors Have Limited Impact In Banded Applicationsmentioning

confidence: 99%

Three-dimensional dynamics of nitrogen from banded enhanced efficiency fertilizers

Janke

Moody

Bell

2020

Nutr Cycl Agroecosyst

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A range of enhanced efficiency fertilizers (EEFs) have been developed in response to widespread recognition of poor nitrogen (N) use efficiency (NUE) in agriculture; however, their effective utilization is not properly understood when applied in sub-surface bands. This study quantified soil chemical changes and the distribution of N species that arose from sub-surface banding of urea, a controlled release polymer-coated urea (PCU) and urea coated with either nitrification inhibitors (NIs) or a urease inhibitor (UI), over 71 days in a field trial. Banding NIs extended the duration of nitrification inhibition for up to 50 days longer than banded urea, although the duration of NI-conferred inhibition was dependant on the rate of NI-urea application. The UI preserved urea-N at a concentration which was 16-fold higher cf. standard urea over 7 days, but no urea-N was detected after 21 days. This suggests that the NUE benefits of UIs are transient when applied in sub-surface bands. Slow release of urea-N from banded PCU resulted in lower concentrations of N in the soil solution. This reduced N dispersal by ca. 50 mm cf. urea, resulting in a N-enriched zone which was considerably smaller. Relatively benign chemical conditions around PCU bands enabled rates of nitrification (NH4–N:NO3–N ratio of 46%) which were similar to urea. Collectively, these results demonstrate the relative efficacy and risks of the different EEF technologies, when applied in fertilizer bands. This knowledge supports the effective utilization of band-applied EEFs for improved NUE in agricultural systems.

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Section: Urease Inhibitors Have Limited Impact In Banded Applicationsmentioning

confidence: 99%

Three-dimensional dynamics of nitrogen from banded enhanced efficiency fertilizers

Janke

Moody

Bell

2020

Nutr Cycl Agroecosyst

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“…Ma et al . () reported that 48 h after applying urea and inducing infiltration on a Crowley silt loam (Typic Albaqualf), the use of NBPT reduced urea hydrolysis by 50% compared with an untreated control. However, if portions of the applied urea remain in the floodwater, N loss to adjacent aquatic ecosystems may be of concern if precipitation events create overflow or breaks in levees and water is not contained within the production field.…”

Section: Introductionmentioning

confidence: 99%

Urea persistence in floodwater and soil used for flooded rice production

Daigh

Savin²,

Brye³

et al. 2014

Soil Use and Management

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Urea is a common fertilizer in delayed-flood rice production in the United States, and its use worldwide has increased dramatically in recent decades. This study aimed to directly quantify urea-N persistence in floodwater and soil used for rice production. We conducted a set of three laboratory experiments to investigate urea-N presence in the floodwater and soil. Untreated urea was applied to dry or wet soil and flooded immediately or urea treated with the urease inhibitor N-(n-butyl)-thiophosphoric triamide (NBPT), or untreated urea was applied to dry soil and flooded after a 5-day delay. Urea-N was analysed colorimetrically (using the microplate-adapted, diacetyl monoxime method) in the floodwater, and at 2-cm intervals in soil after 10-cm long, silt-loam soil columns were flooded for 12, 24, 48 and 96 h. The only management practice that led to insignificant urea-N concentrations in floodwaters was the application of urea followed by a 5-day delay before flooding. Urea-N can persist in floodwaters for an estimated 98 and 120 h after immediately flooding dry-soilapplied or wet-soil-applied untreated urea, respectively. Urea-N concentrations in floodwaters were up to 33 times less when dry-soil-applied than wet-soil-applied. Average NBPT-treated urea-N concentrations in soil ranged up to 63 mg/kg after 24 h of flooding and were <1 mg/kg after 96 h of flooding. The 5-day delay resulted in ≤1 mg urea-N/kg soil when untreated urea was applied. Generally, the threat of N entering adjacent waterways in the form of urea is likely to be limited because of its short-term persistence (≤120 h) in rice floodwater.

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Nitrification and denitrification in the rhizosphere of rice: the detection of processes by a new multi-channel electrode

Arth¹,

Frenzel²

2000

Biology and Fertility of Soils

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Transport of Urea in Flooded Soil Profiles as Affected by Water Percolation Rates and NBPT

Cited by 5 publications

References 0 publications

Three-dimensional dynamics of nitrogen from banded enhanced efficiency fertilizers

Three-dimensional dynamics of nitrogen from banded enhanced efficiency fertilizers

Urea persistence in floodwater and soil used for flooded rice production

Nitrification and denitrification in the rhizosphere of rice: the detection of processes by a new multi-channel electrode

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