Transformation of urea and ammonium sulphate in different soils

Singh, Mahendra; Yadav, D. S.

doi:10.1007/bf02370053

Cited by 11 publications

(2 citation statements)

References 7 publications

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“…and soil characteristics (e.g., pH, organic matter, depth in soil profile, etc. ); as a result, complete hydrolysis of urea applied to soils can take anywhere from 1 to 14 d (Singh and Yadav, 1981; Kumar and Wagenet, 1984; Yadav et al, 1987; Khakural and Alva, 1995; Wali et al, 2003). The effect of soil pH on urease activity has been investigated but has not consistently been linked to the rate of urea hydrolysis in soils.…”

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confidence: 99%

Urea Hydrolysis Rate in Soil Toposequences as Influenced by pH, Carbon, Nitrogen, and Soluble Metals

2016

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A simultaneous increase in the use of urea fertilizer and the incidence of harmful algal blooms worldwide has generated interest in potential loss pathways of urea from agricultural areas. The objective of this research was to study the rate of urea hydrolysis in soil profile toposequences sampled from the Coastal Plain (CP) and Piedmont (PM) regions of Maryland to understand native urea hydrolysis rates (UHRs) as well as the controls governing urea hydrolysis both across a landscape and with depth in the soil profile. A pH-adjustment experiment was conducted to explore the relationship between pH and urea hydrolysis because of the importance of pH to both agronomic productivity and microbial communities. Soils were sampled from both A and B horizons along transects containing an agricultural field (AG), a grassed field border (GB), and a perennially vegetated zone adjacent to surface water. On average, the A-horizon UHRs were eight times greater than corresponding B-horizon rates, and within the CP, the riparian zone (RZ) soils hydrolyzed urea faster than the agricultural soils. The pH adjustment of these soils indicated the importance of organic-matter-related factors (C, N, extractable metals) in determining UHR. These results suggest that organic-matter-rich RZ soils may be valuable in mitigating losses of urea from neighboring fields. Additional field-scale urea hydrolysis studies would be valuable to corroborate the mechanisms described herein and to explore the conditions affecting the fate and transport of urea in agroecosystems.

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Urea Hydrolysis Rate in Soil Toposequences as Influenced by pH, Carbon, Nitrogen, and Soluble Metals

2016

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“…At near neutral pH values, a product of hydrolyzed urea, NH 3 , can be produced (Gould et al, 1986;Singh & Yadav, 1981). Therefore, a rapid increase in ammonium was observed in urea-amended soils between Days 0 and 5 (Supplemental Figure S1a).…”

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confidence: 99%

Phosphorus mineralization affected by urea in an intensively managed agricultural soil

Jianfeng

Arenberg

Arai

2021

Soil Science Soc of Amer J

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A mineralizable P fractionin soils has not been considered in the current agronomic soil P test. Organic P might be a potential source of bioavailable P under the influence of specific soil conditions such as N input. In this laboratory incubation study, the effects of urea (0.1-0.3 g N kg -1 soil) on P mineralization was investigated in an intensively managed agricultural soil using chemical extractions, phosphatase activity analysis, and solution 31 P nuclear magnetic resonance spectroscopy (NMR). All urea application rates stimulated P release and P mineralization after 5 d, and bioavailable P increased for up to 40 d. The result of NMR analysis and phosphatase activity supported a shift from organic P to orthophosphate. Urea applications generally increased labile P from ∼5 to ∼24 μg g -1 . However, acidity generated from the oxidation of NH 4+ under the highest urea treatment (0.3 g of N kg -1 soil) suppressed P mineralization, indicating the degree of urea application rate is sensitive to P mineralization. The results suggested the use of urea could enhance P bioavailability in P-rich agricultural soils. Tapping into reusable organic P resources in soils might be one of the practical and conservative approaches in the current agriculture.

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Impact of Human Activity and Climate on Nitrogen in Agriculture

Kułek

2018

Sustainable Agriculture Reviews

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Transformation of urea and ammonium sulphate in different soils

Cited by 11 publications

References 7 publications

Urea Hydrolysis Rate in Soil Toposequences as Influenced by pH, Carbon, Nitrogen, and Soluble Metals

Urea Hydrolysis Rate in Soil Toposequences as Influenced by pH, Carbon, Nitrogen, and Soluble Metals

Phosphorus mineralization affected by urea in an intensively managed agricultural soil

Impact of Human Activity and Climate on Nitrogen in Agriculture

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