Biochemical changes and distribution of nitrogen from bands of stabilised N-fertilizers in contrasting soils

Janke, Chelsea; Fujinuma, Ryosuke; Moody, Phil; Bell, Michael J.

doi:10.1016/j.geoderma.2020.114770

Cited by 8 publications

(6 citation statements)

References 51 publications

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“…Unlike the Ferralsol, NH4-N was preserved and NO3-N formation inhibited in the DMPP-urea treatment when compared to urea (Fig. 6), with the variable efficacy of NI products between soil types previously reported by Janke et al (2021). Effectively, the low permeability of the Vertisol cf.…”

Section: N Dynamics In the Vertisolmentioning

confidence: 50%

“…Rapid hydrolysis of concentrated urea bands results in significant increases in soil pH, EC and aqueous NH3 concentrations (Janke et al, 2021). This effect was observed in both soils treated with uncoated N-fertilizers (urea and DMPP-urea) and to a lesser extent in blended DMPP-urea and PCU treatments (Figs.…”

Section: Soil Chemical Changes Vary With Fertilizer Form and Soil Typementioning

confidence: 81%

“…1 -3). Since DMPP distribution from fertilizer bands is limited to approximately 1 -3 cm (Janke et al, 2021) and significant concentrations of NH4-N were more widely distributed (up to 7 cm from fertosphere in both urea and DMPP-urea treatments), there was little effect of this inhibitor on nitrification cf. standard urea in this soil.…”

Section: N Dynamics In the Ferralsolmentioning

confidence: 99%

“…DMPP-urea; Janke et al, 2021) and leachate NO3 -(urea cf. PCU; LeMonte et al, 2016) in sandy soils, with no significant differences found between urea and the EEFs.…”

Section: Effective Use Of Eefs Varies With Soil Type and Loss Conditionsmentioning

confidence: 99%

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Impact of contrasting fertilizer technologies on N dynamics from sub-surface bands of ‘pure’ or blended fertilizer applications

Janke

Bell

2022

Preprint

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Abstract. Enhanced efficiency fertilizer (EEF) technologies that employ product coatings to delay nitrogen (N) release or are chemically stabilized to inhibit key steps of N transformations in soil, offer potential for improving N use efficiency (NUE) in agricultural systems. However, the dynamics of N release and transformation from single technologies may result in a spatial or temporal mismatch of N supply and demand during a growing season. This may be overcome by use of blends of different technologies, provided the reduction in the concentration of stabilizing products does not reduce effectiveness. Laboratory incubations quantified the N dynamics around fertilizer bands of polymer-coated urea (PCU) and nitrification inhibited (NI) urea and varying blends of these technologies, and referenced this against conventional urea and biodegradable, plant oil-coated urea (POCU) applied at the same rates in two contrasting soils over 60 days. Blends of NI-urea and PCU typically resulted in N concentrations and distribution that were intermediate to that of the constituent products in unblended applications. Changes in the proportions of each product were mirrored by urea-N concentrations around the bands in both soils, while the proportions of NI-urea in each blend were only related to the extent of nitrification inhibition in the Vertisol. A proportion of the POCU granules burst during initial water imbibition, resulting in initially higher mineral N concentrations cf. PCU. However, both CRFs delayed N release and generation of NO3-N relative to granular urea, and mineral N distribution was similar within each soil. Soil type had a significant impact on banded N dynamics. Where there was little effect of N-fertilizer treatment on NO3-N production in the Ferralsol, the greater impedance of solutes in the Vertisol contributed to a significant inhibitory effect of NI-urea on nitrification in both pure and blended DMPP-urea treatments. Using NO3-N production as a benchmark for the risk of environmental loss, the efficacy of fertilizer treatments in this soil was of: DMPP-urea-PCU blends (higher ratio of PCU may offer small but insignificant benefit) > DMPP-urea = PCU > urea. These findings highlight the importance of soil properties in determining the N dynamics from different banded EEF products. Insights into the efficacy of biodegradable alternatives to polymer coatings and the efficacy of blended EEF products can improve the reliability of N supply while reducing environmental impacts, therefore offering greater opportunities to sustainably improve fertilizer NUE in cropping systems.

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Section: N Dynamics In the Vertisolmentioning

confidence: 50%

Section: Soil Chemical Changes Vary With Fertilizer Form and Soil Typementioning

confidence: 81%

Section: N Dynamics In the Ferralsolmentioning

confidence: 99%

“…DMPP-urea; Janke et al, 2021) and leachate NO3 -(urea cf. PCU; LeMonte et al, 2016) in sandy soils, with no significant differences found between urea and the EEFs.…”

Section: Effective Use Of Eefs Varies With Soil Type and Loss Conditionsmentioning

confidence: 99%

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Impact of contrasting fertilizer technologies on N dynamics from sub-surface bands of ‘pure’ or blended fertilizer applications

Janke

Bell

2022

Preprint

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“…Urea hydrolysis consumes two moles of H + (per mole of urea applied) from the immediate soil surrounding the urea prill to form a 'fertosphere' (Ferguson et al 1984). This localised pH shift can extend up to 35-45 mm from the prill in heavy clay soil (Janke et al 2021) and up to 30 mm in silt loam soil (Black et al 1987). In an acidic soil with high pHBC, positively charged sesquioxides that dissociate to form H + ions or the deprotonation of weakly acidic functional groups from organic matter (carboxylic and phenolic groups) buffer the consumed acidity (Curtin and Trolove 2013).…”

Section: Introductionmentioning

confidence: 99%

Ammonia volatilisation losses from urea applied to acidic cropping soils is regulated by pH buffering capacity

Hearn,

Barton,

Schwenke

et al. 2023

Soil Res.

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Context Ammonia (NH3) volatilisation can be a significant nitrogen (N) loss pathway in the grains industry following the surface broadcast application of urea. However, the extent of urea volatilisation from acidic soils and the soil properties that regulate this N loss pathway have not been investigated widely. Aims We conducted a laboratory incubation experiment to measure NH3 volatilisation loss potential following the broadcast application of urea prills (1–2 mm diameter; 50 kg N ha−1) onto moistened acidic and neutral cropping soils, sampled from four long-term cropping research sites. Methods The selected soils varied in pH, clay content, organic carbon, pH buffering capacity (pHBC) and cation exchange capacity. Volatilised NH3 was captured in a phosphoric acid trap after 7, 14 and 21 days and then measured using colorimetric analysis. We compared the measured NH3 losses with predicted NH3 losses derived from an existing empirical NH3 volatilisation prediction model. Key results Of the applied urea-N, 0.9–25% was volatilised. Cumulative NH3 losses were strongly related (R2 = 0.77) with soil pHBC derived from a pedotransfer function. The existing NH3 loss model generally had poor predictive capacity (RMSE = 34%). Conclusions Using clay content as a surrogate variable for pHBC in the predictive model for sandy kaolinitic soils where it is largely a function of organic carbon content can cause poor estimates of NH3 volatilisation loss potential. Implications Grain production on sandy, acidic soils with low pHBC could lead to substantial NH3 volatilisation losses if urea is broadcast.

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Mitigate N2O emissions while maintaining sugarcane yield using enhanced efficiency fertilisers and reduced nitrogen rates

Reeves,

Wang,

Ginns

2023

Nutr Cycl Agroecosyst

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Biochemical changes and distribution of nitrogen from bands of stabilised N-fertilizers in contrasting soils

Cited by 8 publications

References 51 publications

Impact of contrasting fertilizer technologies on N dynamics from sub-surface bands of ‘pure’ or blended fertilizer applications

Impact of contrasting fertilizer technologies on N dynamics from sub-surface bands of ‘pure’ or blended fertilizer applications

Ammonia volatilisation losses from urea applied to acidic cropping soils is regulated by pH buffering capacity

Mitigate N2O emissions while maintaining sugarcane yield using enhanced efficiency fertilisers and reduced nitrogen rates

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