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Details for article 8 of 23 found articles
| Title: |
Copper fractions extracted by mehlich-3 from soils amended with either CuSO4 or copper rich pig manure |
| Author: |
Reed, S. T. Allen, M. G. Martens, D. C. McKenna, J. R. |
| Appeared in: |
Communications in soil science and plant analysis |
| Paging: | Volume 24 (1993) nr. 9-10 pages 827-839 |
| Year: |
1993-06 |
| Contents: |
The Mehlich-3 procedure is being adapted as a general soil test because it has the advantage of simultaneous extraction of P, macronutrient and micronutrient cations, as well as an improved ability to extract Cu over that of the double acid soil test. It would be desirable if this procedure could be used to estimate both deficient and toxic Cu levels in soils. This study was undertaken to determine soil Cu extraction patterns of Mehlich-3. Soils used were a Bertie fine sandy loam (fine-loamy, mixed, thermic Aquic Hapludult), Guernsey silt loam (fine, mixed, mesic, Aquic Hapludalf), and a Starr-Dyke clay loam (fine-loamy, mixed, thermic Fluventic Dystochrept-clayey, mixed, mesic Typic Rhodudult) from the Atlantic Coastal Plain, Appalachian, and Piedmont regions of Virginia, respectively. Copper was applied to field plots at an average 13-year cumulative level of 365 kg ha-1 as either Cu rich pig manure or CUSO4. Although Cu application exceeded the USEPA maximum safe Cu loading rate of 280 kg ha-1 for these soils, the pig manure and CuSO4 treatments had no affect on corn grain yield or Cu concentration, however, there was a trend toward reduced early season growth on one of the three soils (i.e., on the Bertie soil). Applied Cu was held by the three soils in largely unavailable forms. Soils were obtained for laboratory experiments from the control and treatments that received either Cu rich manure or CuSO4 with Cu levels equivalent to that in the manure. Soil samples were divided into two groups; one was pre-extracted by the Mehlich-3 procedure and the other was not pre-extracted. Samples were then sequentially extracted to determine exchangeable, specifically adsorbed, organically bound, and oxide occluded Cu fractions remaining in the soil. The amount of Mehlich-3 extractable Cu was a function of total applied Cu, and the amount Mehlich-3 extracted from the manure treatment was greater than or equal to that extracted from the CuSO4 treatment. The Mehlich-3 procedure extracted mainly the exchangeable and specifically absorbed Cu at both relatively high and low levels of Cu in the three soils. Because these are the available Cu fractions, the procedure will likely be suitable to estimate both deficient and toxic Cu levels. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 8 of 23 found articles
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