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Details for article 10 of 24 found articles
| Title: |
59Fe isotope dilution methods to determine labile Fe in soil and Fe uptake from fertilizer sources |
| Author: |
Wallace, A. Patel, P. M. Mueller, R. T. |
| Appeared in: |
Communications in soil science and plant analysis |
| Paging: | Volume 7 (1976) nr. 1 pages 65-75 |
| Year: |
1976 |
| Contents: |
The labile Fe in calcareous soils is probably divided into at least two fractions. One is readily available to plants and another is potentially available either upon extraction with dictating agent or upon interaction with soil or plant roots of species which are efficient in the mobilization and uptake of Fe. Equilibration of 59Fe in soil docs not result in a true measurement of labile Fe when plants are grown, but a close approximation can be obtained with use of a series of different levels of chelating agents with 59Fe equilibrated soils. Extrapolation to a zero level of chelating agents gives the amount of one fraction of labile Fe while the saturation point with high levels of chelating agent gives the amount of potentially available Fe. Differences in specific activity of DTPA (diethylene triamine pentaacetic acid) extracted Fe with that taken up by plants are partially explained by these effects. Different plants varying in susceptibility to Fe deficiency were grown in soil amended to give low (S-treated) and high (lime-treated) soil pH. Carrier-free 59Fe had been incorporated with the soil so that labile Fe, specific activity of 59Fe in plants and soil extracts and proportion coming from fertilizer could be determined. One conclusion is that Fe2O3 more closely represented soil labile Fe than did FeEDDHA (ferric ethylenediamine di(o-hydroxyphenylacetic acid) ). The specific activity of 59Fe in plants more closely followed that in an extract with 10-2 M EDTA (ethylenediamine tetraacetic acid) than other agents. In another test, the relationship was closest with 0.05 and 0.08 M DTPA and EDDHA. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 10 of 24 found articles
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