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Relative efficiency of Fe-oxide strip for extracting
phosphorus in some Egyptian soils
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Abstract: Three methods for extracting available phosphorous in some Egyptian soils, has been compared with Fe-strip method which proposed by Tzy-Huei Lin et al. (1991). Moreover, to provide a base of comparison, a biological treatment was also established.
The results showed that the highest total-P value was recorded for clay soils (1521.65 mg kg-1), followed by sandy soil (598.4 mg kg-1) and calcareous soils (535.55 mg kg-1). The statistical analysis revealed that clay content was positively correlated (r= 0.696**) while calcium carbonate content was negatively correlated (r = -0.601*) with the total-P.
The data showed that the extracted P percent (from its total) by the tested extractants may be ranked as follows; Soltanpour and Schwab (1977) (5.56%) > Fe-strip (1.3%). While Bray1 and Kurtz (1943) and Olsen and Sommers (1982) methods released minor portion of P. the high P portion extracted by Soltanpour and Schwab may be due to 1) a particular affinity between DTPA and P, 2) this extractant may released various pools of P beside the available portion into solution and 3) the effect of high ionic strength (1M) of NH4HCO3.
The data also showed that the percent of P released from calcareous soils > sandy soils > clay soils. This may be attributed to the employed methods that may destroy a number of P-minerals in calcareous soils, consequently the recovery % of P increased. While the minor percent of P released from clay soil may be attributed to its highly adsorptive power in that soil. The statistical results showed that Fe-strip was significantly correlated with the widely used soil extractants (r= 0.451*).
The results of biological evaluation of the tested methods indicated that only Fe-strip (M4) and Olsen and Sommer method (M3) were significantly correlated with the amount of P-uptake by plants. The regression equations for this relation were:
Y = 12.59 + 0.94 X R2 = 19.9
Y = 15.30 + 4.86 X R2 = 19.6, respectively.
These results concluded that Fe-strip method was satisfactory and gave reliable information about available P for plant
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| Publication year |
2005
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| Pages |
1287-1295
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| Availability location |
Soils, Water and Environment Research Institute, ARC
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| Availability number |
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| Organization Name |
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| Country |
Egypt
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| City |
Mansoura
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| Publisher |
Name:
Faculty of Agriculture, Mansoura University
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| serial title |
Mansoura University Journal of Agricultural Sciences
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| ISSN |
1110-0346
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| Volume |
30
. 2
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| Department |
Soil Physics and Chemistry
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| Author(s) from ARC |
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| Agris Categories |
Soil chemistry and physics
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AGROVOC
TERMS |
Calcareous soils.
Clay soils.
Extraction in chemical analysis.
Iron.
Phosphorus.
Sandy soils.
Statistical methods.
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| Publication Type |
Journal
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