Urea and Phosphate Interactions in Fertilizer Microsites: Ammonia Volatilization and pH Changes

Fan, M. X.; MacKenzie, A. F.

doi:10.2136/sssaj1993.03615995005700030034x

Cited by 92 publications

(89 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There was a significant accumulation of NH 4 + in 0-1.5 cm depth for the treatments with HA compared with urea alone (Table 3) except for T2. This finding is comparable with that of Fan and Mackenzie [3] . Nitrate, accumulation was statistically different for T4 and T5 only.…”

Section: Resultssupporting

confidence: 90%

“…Ammonia volatilization is most likely to occur even in acidic soils due to relatively high pH and also high concentration of NH 4 + ion around the microsite where the urea granules hydrolyses [3][4][5] . The pH in particular affects the equilibrium between NH 4 + ion and NH 3 (g) such that the relative concentration of NH 3 (g) increases from 0.1-1, 10 and 50% as the pH changes respectively from 6, 7, 8 and 9.…”

Section: Introductionmentioning

confidence: 99%

“…The pH in particular affects the equilibrium between NH 4 + ion and NH 3 (g) such that the relative concentration of NH 3 (g) increases from 0.1-1, 10 and 50% as the pH changes respectively from 6, 7, 8 and 9. It has been found that mixtures of urea and acidic materials can decrease ammonia loss while increasing the concentration of NO 3 − and NH 4 + ions [3,[5][6][7] According to Brady and Weil [8] , high concentration of NO 3 -and NH 4 + ions in the soil may not guarantee plant N use due to lack of good retention and leaching. Mixing Humic Acids (HA) with urea can reduce the pH and ammonia volatilization because they are high in CEC and total acidity thus providing good NH 4 + retention as well as preventing its loss through leaching [9] .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reduction of Ammonia Loss from Urea through Mixing with Humic Acids Isolated from Peat Soil (Saprists)

Bernard¹,

Ahmed²,

Majid³

et al. 2009

American J. of Environmental Sciences

View full text Add to dashboard Cite

Problem statement: Application of urea as a source of nitrogen fertilizer has an adverse effect on ammoniacal loss to the environment. This study was conducted to reduce ammonia loss from urea by mixing with Humic Acids (HA) isolated from Saprists peat. Approach: The effects of urea amended with four different amounts of humic acids, 0.25, 0.50, 0.75 and 1.00 g were evaluated in laboratory conditions using a closed dynamic air flow system. The mineral soil that was used as medium for the study was Bekenu series (typic paleudults). Amnonia loss, soil pH, exchangeable ammonium, available nitrate, exchangeable K, Ca, Mg and Na were determined using standard procedures. Results: All the treatments with HA significantly reduced ammoinia loss compared to urea alone. Increasing the amount of HA also significantly retained soil exchangeable ammonium and available nitrate. Treatments with HA had no significant effect on the concentrations of Mg, K and Ca, except for Na. The effect of HA in the mixtures on ammonia loss was related to their effect on the formation of ammonium over ammonia. Conclusion: Surface-applied urea fertilizer efficiency could be increased when coated with 1.00 g of HA.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reduction of Ammonia Loss from Urea through Mixing with Humic Acids Isolated from Peat Soil (Saprists)

Bernard¹,

Ahmed²,

Majid³

et al. 2009

American J. of Environmental Sciences

View full text Add to dashboard Cite

show abstract

“…Effect of citric acid-incorporated MUCH NH3 volatilization High NH3 loss from soil surface applied with urea can be expected even in acidic soils due to high NH4 + concentration and consequently alkaline pH in urea-applied micro-site (Fan and Mackenzie, 1993). Methods to reduce soil pH around the micro-site are the use of acidic materials such as humic acid and triple superphosphate (Ahmed et al;, Chien et al, 1987.…”

Section: Characterization Of Cit-much To Decrease Ph Ofmentioning

confidence: 99%

“…Even at pH of 7.5, ammonia volatilization increased twice that at pH of 6.0 (Overdahl et al, 1991.). Fan and Mackenzie (1993) showed the effect of acidic materials on ammonia loss to retard urea hydrolysis by reducing pH in the fertilizer micro-site. Therefore MUCH incorporated with acidic materials may have the effect to decrease pH of the micro-site applied with MUCH.…”

Section: Introductionmentioning

confidence: 99%

Metal-Urea-Montmorillonite Hybrid Incorporated with Citric Acid

Kim¹,

Kim²,

Ryu³

et al. 2013

Korean Journal of Soil Science and Fertilizer

View full text Add to dashboard Cite

Coal char affects soil pH to reduce ammonia volatilization from sandy loam soil

Panday

Mikha

Maharjan

2020

Agrosystems Geosci & Env

View full text Add to dashboard Cite

Ammonia (NH 3) volatilization loss adversely affects N availability in soil-plant systems, reduces crop yield, and negatively impacts environment. Char (coal combustion residue), which contains up to 293 g kg −1 total C by weight, has been shown to reduce NH 3 volatilization due to its considerably high surface area and cation exchange capacity. The NH 3 loss can be greatly affected by a shift in soil pH or urea hydrolysis. A 21-d laboratory study was conducted to evaluate the effects of char on soil pH, N transformations, and subsequent NH 3 volatilization in sandy loam soil. Two char rates (0 and 13.4 Mg C ha −1) and two urea rates (0 and 200 kg N ha −1) were mixed in soil in four 2-way combinations with four replications of each. There were 11 sets of all treatment combinations and each set was analyzed for soil moisture, pH, NH 3 volatilization, and residual N (urea, NH 4 , and NO 3) every other day for 3 wk. Char application reduced cumulative NH 3 loss in the fertilized treatment. Reduction in NH 3 loss due to char addition was evidenced by greater residual NH 4-N on certain days in treatments with char compared to treatments without char. Char did not affect urea hydrolysis process but it lowered soil pH in the fertilized treatments in the first week. This study supported our hypothesis that char altered soil pH and thereby reduced NH 3 volatilization loss from the fertilized soil. Abbreviations: CEC, cation exchange capacity. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

Urea and Phosphate Interactions in Fertilizer Microsites: Ammonia Volatilization and pH Changes

Cited by 92 publications

References 0 publications

Reduction of Ammonia Loss from Urea through Mixing with Humic Acids Isolated from Peat Soil (Saprists)

Reduction of Ammonia Loss from Urea through Mixing with Humic Acids Isolated from Peat Soil (Saprists)

Metal-Urea-Montmorillonite Hybrid Incorporated with Citric Acid

Coal char affects soil pH to reduce ammonia volatilization from sandy loam soil

Contact Info

Product

Resources

About