Transformation and Movement of Band-Applied Urea, Ammonium Sulfate, and Ammonium Hydroxide During Incubation in Several Manitoba Soils

Pang, P. C.; Hedlin, R. A.; Cho, C. M.

doi:10.4141/cjss73-048

Cited by 39 publications

(15 citation statements)

References 3 publications

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“…Therefore, providing high concentrations of nutrients that stimulate root growth at the site of root contact (e.g. NH 4 + and HPO 4 2− /H 2 PO 4 − or CO(NH 2 ) 2 and HPO 4 2− /H 2 PO 4 − , the later under optimal ammonification conditions) [2,5] and are poorly mobile in soil [6][7][8][9], crops can more efficiently acquire fertilizer-depot nutrients, thus improving their yields [4]. Nevertheless, it has been shown that intense rooting may not occur around fertilizer depots based on manure or mineral N under greenhouse and field conditions [10]; (Müller et al 2009, unpublished results).…”

Section: Introductionmentioning

confidence: 99%

Densely rooted rhizosphere hotspots induced around subsurface NH4 +-fertilizer depots: a home for soil PGPMs?

Nkebiwe

Neumann

Müller

2017

Chem. Biol. Technol. Agric.

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Background: Populations of plant growth-promoting microorganisms (PGPMs) inoculated in natural soil typically decline over time due unfavourable biotic and/or abiotic factor(s). Improving subsurface root density may enhance PGPM establishment due to high concentrations of organic nutrients released as root exudates. Placing subsurface root-attracting NH 4 + -fertilizer depots may form such zones of dense localized rooting ("rhizosphere hotspots") that can enhance PGPM survival. Nevertheless, required soil conditions that favour formation of rhizosphere hotspots are unknown. This study aimed to investigate: (1) background soil N min effect on NH 4 + -depot-zone root growth; (2) PGPM tolerance to high NH 4 + concentrations (± nitrification inhibitor, DMPP); (3) ability to solubilize sparingly soluble inorganic phosphates; (4) and establishment in a subsurface NH 4 + -depot. Methods:We conducted a greenhouse rhizobox experiment using spring wheat (Triticum aestivum L.) to investigate the effect of background N min (0, 5, 20 and 60 mg N kg Conclusion:These results show the first promising effects of combining fertilizer placement and application of P-solubilizing PGPMs on plant growth.

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Section: Introductionmentioning

confidence: 99%

Densely rooted rhizosphere hotspots induced around subsurface NH4 +-fertilizer depots: a home for soil PGPMs?

Nkebiwe

Neumann

Müller

2017

Chem. Biol. Technol. Agric.

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“…The dry soil was passed through a 2-mm sieve and moistened to field capacity (327o moisture). The sample was loosely packed to the halfway mark of a l2-cm-long soil column constructed as described by Pang et al (1973) concentration of NO3-in the warmer half of the soil column. This was the case with NO3-.…”

Section: Methodsmentioning

confidence: 99%

Distribution and Transformation of Band-Applied Urea in Soil Following Incubation Under Isothermal and Temperature Gradient Conditions

Pang¹,

Cho²,

Hedlin³

1977

Can. J. Soil. Sci.

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Urea was added as a band in the middle of 12-cm-long columns of Wellwood clay loam (pH 6.6) and the soil was incubated at constant uniform temperatures of 10, 15 and 20 C. A similar set of the soil samples was incubated in columns which had a temperature of 23 C at one end and 8.5 C at the other end. At uniform temperatures the rate of disappearance of ammonium and the formation of nitrate from the banded urea was found to increase with increasing temperature. Nitrite was found to accumulate during the incubation period but disappeared with the prolonged incubation at 15 and 20 C. At 10 C incubation, the maximum nitrite accumulation occurred at 12 wk, the longest incubation time used. Various ionic species, NH4+, NO2− and NO3− were found to be nearly symmetrically distributed from the point of placement. When the soil was incubated under a temperature gradient, NO3− and to a lesser degree NH4+ accumulated near the end of the column.

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“…There Previous experiments (Pang et al 1973) showed that there were marked differences in urea at a rate of 800 kg N/ha was applied in a band at the mid-section of a column as previously described (Pang et al 1973 In the Keld soil (pH 5.a) (Fig. 1) Dancer et al (1973).…”

mentioning

confidence: 96%

EFFECTS OF pH AND NITRIFIER POPULATION ON NITRIFICATION OF BAND-APPLIED AND HOMOGENEOUSLY MIXED UREA NITROGEN IN SOILS

Pang¹,

Cho²,

Hedlin³

1975

Can. J. Soil. Sci.

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PaNc, P. C., Cno, C. M. lNo HrorrN, R. A. 19j5. Effects ofpH and nitrifier population on nitrification of band-applied and homogeneously mixed urea nitrogen in soils. Two soils, Keld silty clay loam (pH 5.4) and Wellwood clay loam (pH 6.6), were used to investigate the effects of modifying soil pH upon the nitrification of band-applied ureaat20 C. ThepH of the Keld soil was adjusted to 6.5 and 7.3 with Ca (OH)r, whereas the Wellwood soil was adjusted to 5.6with H2SO4. In addition, nitrification of nitrogen in a homogeneously mixed soil-urea suspension at 20 c was studied using the two soils mentioned and also Morton very fine sandy loam (pH 8'2). There

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Transformation and Movement of Band-Applied Urea, Ammonium Sulfate, and Ammonium Hydroxide During Incubation in Several Manitoba Soils

Cited by 39 publications

References 3 publications

Densely rooted rhizosphere hotspots induced around subsurface NH4 +-fertilizer depots: a home for soil PGPMs?

Densely rooted rhizosphere hotspots induced around subsurface NH4 +-fertilizer depots: a home for soil PGPMs?

Distribution and Transformation of Band-Applied Urea in Soil Following Incubation Under Isothermal and Temperature Gradient Conditions

EFFECTS OF pH AND NITRIFIER POPULATION ON NITRIFICATION OF BAND-APPLIED AND HOMOGENEOUSLY MIXED UREA NITROGEN IN SOILS

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