Availability of Cu, Zn and Mn in soils: I.—Influence of soil pH, organic matter, and extractable phosphorus

Dolar, S. G.; Keeney, D. R.

doi:10.1002/jsfa.2740220602

Cited by 42 publications

(11 citation statements)

References 10 publications

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“…However, the solution pH was all-important in determining the solution-solid copper ratio in adsorption experiments. No previous studies of this type with micronutrients have been reported, but our results are consistent with those of Dolar and Keeney (1971) who found that the quantities of copper extracted from soils by three different buffered extractants were almost independent of soil pH. co-workers (1973, 1981) found that copper concentrations in soil solutions and adsorption experiments are controlled by specific adsorption onto organic matter and iron and manganese oxides.…”

Section: J R S a N D E R Ssupporting

confidence: 95%

The effect of pH upon the copper and cupric ion concentrations in soil solutions

Sanders

1982

Journal of Soil Science

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Soil samples whose pH had been adjusted to between 4.5 and 7.5 either for long periods in the field or short periods in the laboratory were incubated after wetting with water or 0.01 M CaCl2. Copper concentrations in the soil solutions decreased only slightly as the solution pH increased, but free cupric ion concentrations decreased considerably. The copper concentrations were smaller and the proportion of copper present in solution as cupric ion at a given pH was larger when CaCl2 rather than water was used. Complexed organic species made up most of the copper in all solutions. The duration of pH adjustment did not affect these results.Copper adsorption isotherms were determined on the soils using low equilibrium solution concentrations. As a given copper concentration the quantity of copper adsorbed increased and the proportion of copper in solution present as cuprk ion decreased with pH increase; again the duration of pH adjustment did not affect the results. IntroduclionA knowledge ofthe concentration and form ofa trace element in the soil solution and the factors that control these is essential for understanding the mechanisms of its uptake by plants. Determination of the free metal ion concentration is of fundamental importance because this species enters into all equilibria between different forms of the metals in solution. This paper describes measurements of the effect of pH upon the distribution of copper between the solid phase, complexed copper species in solution, and the free cupric ion, in a series of samples from plots whose pH had been adjusted in the field to between 4.5 and 7.5 over a long period. Similar measurements were made on samples of the same soil whose pH had recently been altered in the laboratory to see whether the duration ofa pH change affected the distribution of copper.Determinations of adsorption isotherms were made on the same soil samples in order to study the combined effects of pH and amount of added copper on the equilibrium between solid-phase copper, complexed copper species in solution, and free cupric ions. E.rperimenta1The soils used were samples of a sandy loam (Marcham series) from Kennington Extension Forest Nursery, Berkshire, where plots were laid down in 1948 to observe 679

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Section: J R S a N D E R Ssupporting

confidence: 95%

The effect of pH upon the copper and cupric ion concentrations in soil solutions

Sanders

1982

Journal of Soil Science

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“…Similarly, a higher field soil pH led to a smaller fraction of the manganese and zinc in the soil being extracted by DTPA at a constant (buffered) pH. No previous studies of this kind using micronutrients and displaced soil solutions have been reported, but the results using DTPA are consistent with those of Dolar & Keeney (1971) who used several buffered extractants.…”

Section: (C) Comparisons Between the Effects Oj'jield Ph And Laboratosupporting

confidence: 86%

The effect of pH on the total and free ionic concentrations of mnganese, zinc and cobalt in soil solutions

Sanders

1983

Journal of Soil Science

109

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Sum ma rySamples of five soils whose pH in the field had been adjusted to between 5.0 and 7.5 were incubated with water or 0.01 M CaC12 at 90% field capacity. Additional samples of the most acid soil were limed to various pH values immediately before incubation.Manganese, zinc and cobalt concentrations in the soil solutions, collected by displacement, decreased as the pH increased; the concentrations in calcium chloride solutions were higher than those in water solutions. The free divalent ions Mn2+, Zn2+ and Co2+ were the major metal species in solution at pH 5 but the proportion of the metals present as the free ion decreased as the pH increased.Differences in the manganese and zinc concentrations in the solutions were due not only to the pH of these solutions but also to the original pH of the soil in the field.

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“…Generally, DTPA has been found to separate soil treatment levels of Cu and Zn from both organic and inorganic sources (Follett and Lindsay, 1971;Korcak and Fanning, 1978). The DTPA extractable Cu (DTPACu) level of 2.0 mg kg-l in the untreated plots is within the normal range of 0.2 to 3.2 mg Cu kg-i reported for various soils (Dolar and Keeney, 1971;Follett and Lindsay, 1971;Korcak and Fanning, 1978). Application of 226kgCuha -1 induced a sevenfold increase in DTPACu to 14.8 mg kg-1.…”

Section: Soil Parametersmentioning

confidence: 96%

“…The availability of Cu and Zn to plants has been found to interact with pH, organic matter, and P (Dolar and Keeney, 1971;Martens, 1968). After 16yr, the soil pH, organic matter, and extractable P were fairly uniform over the test area (Table III).…”

Section: Soil Parametersmentioning

confidence: 99%

The effects on corn and on a rhodic paleudult soil of 17 annual Cu and Zn sulfate additions

Gettier

Martens

Donohue

1989

Water Air Soil Pollut

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A long-term field experiment was established in 1967 and continued through 1983 to evaluate the response of corn (Zea mays L.) and the loading capacity of a Davidson clay loam soil (clayey, kaolinitic, thermic Rhodic Paleudult) to yearly additions of Cu and Zn sulfates. By 1983, the 17 annual additions of Cu and Zn resulted in cumulative totals up to 280kg Cu and 560 kg Zn ha-~. These Cu and Zn additions, either alone or together, did not cause any grain or stalk yield decreases. The DTPA extractant separated most of the soil treatment levels for both Cu and Zn. The sevenfold increase in DTPA extractable Cu and eighteenfold increase in DTPA extractable Zn followed linear relationships to treatment levels. Copper concentrations in the blades and grain were not related to soil additions of Cu or Zn. However, Zn concentrations in blades and grain were directly related to each other, to soil Zn treatment levels and to DTPA Zn. Increasing blade Zn concentrations were accompanied by decreasing blade Mn concentrations.

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Availability of Cu, Zn and Mn in soils: I.—Influence of soil pH, organic matter, and extractable phosphorus

Cited by 42 publications

References 10 publications

The effect of pH upon the copper and cupric ion concentrations in soil solutions

The effect of pH upon the copper and cupric ion concentrations in soil solutions

The effect of pH on the total and free ionic concentrations of mnganese, zinc and cobalt in soil solutions

The effects on corn and on a rhodic paleudult soil of 17 annual Cu and Zn sulfate additions

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