/sup 59/Fe isotope dilution methods to determine labile Fe in soil and Fe uptake from fertilizer sources
The labile Fe in calcareous soils is probably divided into at least two fractions. One is readily available to plants and another is potentially availabe either upon extraction with chelating agent or upon interaction with soil or plant roots of species which are efficient in the mobilization and uptake of Fe. Equilibrium of /sup 59/Fe in soil does 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 /sup 59/Fe equilbrated 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 /sup 59/Fe had been incorporated with the soil so that labile Fe, specific activity of /sup 59/Fe in plants and soil extracts and proportion coming from fertilizer could be determined. One conclusion is that Fe/sub 2/O/sub 3/ more closely represented soil labile Fe than did FeEDDHA (ferric ethylenediamine di(o-hydroxyphenylacetic acid). The specific activity of /sup 59/Fe in plants more closely followed that in an extract with 10/sup -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.
- Research Organization:
- Univ. of California, Los Angeles
- OSTI ID:
- 7184664
- Journal Information:
- Commun. Soil Sci. Plant Anal.; (United States), Journal Name: Commun. Soil Sci. Plant Anal.; (United States) Vol. 7:1; ISSN CSOSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
60 APPLIED LIFE SCIENCES
AMINO ACIDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOMASS
CARBOXYLIC ACIDS
CHELATING AGENTS
DAYS LIVING RADIOISOTOPES
DRUGS
DTPA
EDTA
ELEMENTS
ENERGY SOURCES
EVEN-ODD NUCLEI
FERTILIZERS
INTERMEDIATE MASS NUCLEI
IRON
IRON 59
IRON ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPE DILUTION
ISOTOPES
METALS
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANTS
RADIOISOTOPES
RADIOPROTECTIVE SUBSTANCES
RENEWABLE ENERGY SOURCES
RESPONSE MODIFYING FACTORS
SOILS
TRACER TECHNIQUES
TRANSITION ELEMENTS
UPTAKE