Kinetic analysis of cystine cycling through the solution of a gray luvisol and an andept soil

Monreal, Carlos M.; McGill, W. B.

doi:10.1016/0038-0717(89)90063-1

Cited by 12 publications

(2 citation statements)

References 35 publications

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“…Putnam and Schmidt (1959) reported half lives for strongly sorbed amino acids of between 24 and 48 hours after addition of very high amounts of amino acid to soil (~1200 mg kg-'). In contrast to the results of Verma et al (1975), the depletion of cystine added to soil at a realistic concentration of 60 pg kg-l showed that ~72% of the added amino acid had been taken up by the microbial biomass after 6 hours, of which 22% was released as CO, (Monreal and McGill, 1989).…”

Section: Discussioncontrasting

confidence: 83%

Role of proteinaceous amino acids released in root exudates in nutrient acquisition from the rhizosphere

et al. 1994

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The role of proteinaceous amino acids in rhizosphere nutrient mobilization was assessed both experimentally and theoretically. The degree of adsorption onto the soil's solid phase was dependent on both the amino acid species and on soil properties. On addition of amino acids to both soil and freshly precipitated Fe( OH), , no detectable mobilization of nutrients (K, Na, Ca, Mg, Cu, Mn, Zn, Fe, S, P, Si and Al) was observed, indicating a very low complexation ability of the acidic, neutral and basic amino acids. This was supported by results from a solution equilibria computer model which also predicted low levels of amino acid complexation with solutes present in the soil solution. On comparison with the Fe(OH), and equilibria data obtained for the organic acid, citrate, it was concluded that amino acids released into the rhizosphere have a limited role in the direct acquisition of nutrients by plants. The effectiveness of root exudates such as amino acids, phytosiderophores and organic acids in nutrient mobilization from the rhizosphere is discussed with reference to rhizosphere diffusion distances, microbial degradation, rate of complexation and the root's capacity to recapture exudate-metal complexes from the soil.

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Section: Discussioncontrasting

confidence: 83%

Role of proteinaceous amino acids released in root exudates in nutrient acquisition from the rhizosphere

et al. 1994

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“…For example, McGill's Ph.D. student C.M. Monreal used 14 C to study cystine cycling in soil (Monreal and McGill 1989a, 1989b, 1989c, 1989d. N.G.…”

Section: Radioactive Isotope Workmentioning

confidence: 99%

Isotope applications to soil science at the University of Alberta — an historical perspective

Feland

Quideau

2020

Can. J. Soil. Sci.

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For the past 70 yr, researchers in the Soil Science/Renewable Resources Department at the University of Alberta have used isotopes to study topics of ecological importance. This review highlights the soil isotope research conducted within our department over this time, including an historical overview of studies of interest. Analytical techniques and advances in instrumentation are discussed, focusing on the measurement of light stable isotope ratios (i.e., for C, H, N, S, and O) using isotope ratio mass spectrometry (IRMS). Early soil isotope work (1950–2000s) focused on agricultural soils and soil fertility issues. These studies included the use of radioactive isotopes such as 14C and 35S, and (or) artificially enriched stable isotopes including 15N-labelled fertilizers. More recently (2000–present), the scope of research widened to include natural-abundance stable isotope ratio studies as higher-sensitivity IRMS systems became more prevalent. Current isotope research topics include N biogeochemistry in natural and managed ecosystems, land management effects on greenhouse gas emissions, carbon cycling in northern landscapes, paleo-reconstruction in peatlands, carbon sequestration in boreal forests, and biodegradation of petroleum hydrocarbons. Further technological progress also enabled new techniques such as compound-specific IRMS analysis, including δ13C and δ2H measurements of soil n-alkanes and phospholipid fatty acids. In conclusion, current IRMS instrumentation presents unparalleled opportunities for multidisciplinary research to track carbon, plant nutrients, and pollutants as they move through soils.

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The Effects of Sorption on the Bioavailability of Pesticides

Sims¹,

Radosevich²,

He³

et al. 1991

Biodegradation

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Kinetic analysis of cystine cycling through the solution of a gray luvisol and an andept soil

Cited by 12 publications

References 35 publications

Role of proteinaceous amino acids released in root exudates in nutrient acquisition from the rhizosphere

Role of proteinaceous amino acids released in root exudates in nutrient acquisition from the rhizosphere

Isotope applications to soil science at the University of Alberta — an historical perspective

The Effects of Sorption on the Bioavailability of Pesticides

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