EXCHANGEABLE AND NONEXCHANGEABLE PHOSPHATE SORPTION IN PORTUGUESE SOILS

被引：13

作者：

FERNANDES, MLV

WARREN, GP

机构：

[1] Secção Autónoma de Química Agrícola, Instituto Superior de Agronomia, Lisboa Codex

[2] Department of Soil Science, University of Reading, Reading, RG1 5AQ, London Road

来源：

FERTILIZER RESEARCH | 1994年 / 37卷 / 01期

关键词：

ALUMINUM; FREUNDLICH EQUATION; IRON; LANGMUIR EQUATION; P-32; P-SORPTION CAPACITY; TEMKIN EQUATION;

D O I：

10.1007/BF00750670

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Total amounts of phosphate (P) sorbed were measured for 6 Portuguese soils of widely varying properties. P-32 was used to assess the isotopically exchangeable and non-exchangeable sorbed P. Total sorbed and exchangeable P were described by modified Freundlich equations and non-exchangeable P by a Temkin equation. The Langmuir equation also proved to fit the data for non-exchangeable P well. The amount of total sorbed P required to attain 0.2 mg P l-1 in solution ranged from 5.3 to 819 mg P kg-1. At this concentration exchangeable and non-exchangeable P values varied from 62.4 to 536.6 and from 0.4 to 322.1 mg P kg-1 respectively. There were highly significant (p < 0.01) correlations between soil organic matter and all forms of sorbed P (total sorbed, exchangeable and non-exchangeable). The P sorption parameters with correlation coefficients greater than 0.967 were parameters a and b of the modified Freundlich equation b(n) of Temkin and parameters a of the Langmuir equation. Aluminium extracted by acid oxalate (Al(OX)) and dithionite (Al(di)) showed highly significant correlation coefficients (r = 0.972) with the same sorption parameters. But P sorption was not closely related to the clay content Fe(OX) and Fe(di). It was concluded that extractable aluminium (Al(OX) and Al(di)) had the most important effects on P sorption in these soils.

引用

页码：23 / 34

页数：12

共 32 条

[21]

Nye P.H., The use of exchange isotherms to determine diffusion coeficients in soil, Int Congr Soil Sci Tran 9th (Adelaide, Aust), 1, pp. 117-125, (1968)

[22]

Olsen R.E., Khasawneh F.E., Use and limitations of physical-chemical criteria for assessing the status of phosphorus in soils, The role of Phosphorus in Agriculture, pp. 361-410, (1980)

[23]

Olsen S.R., Watanabe F.S., A method to determine a phosphorus adsorption maximum of soils as measured by the Langmuir isotherm, Soil Science Society of America Journal, 21, pp. 144-149, (1957)

[24]

Olsen S.R., Cole C.V., Watanabe F.S., Dean L.A., Estimation of available phosphorus in soils by extraction with sodium bicarbonate, (1954)

[25]

Owusu-Bennoah E., Acquaye D.K., Phosphate sorption characteristics of selected major Ghanaian soils, Soil Sci, 148, pp. 114-123, (1989)

[26]

Ozanne P.G., Shaw T.C., Phosphate sorption by soils as a measure of the phosphate requirement for pasture growth, Australian Journal of Agricultural Research, 18, pp. 601-612, (1967)

[27]

Saini G.R., McLean A.A., Phosphorus retention capacities of some New Brunswick soils and their relationship with soil properties, Canadian Journal of Soil Science, 45, pp. 15-18, (1965)

[28]

Sanchez P.A., Uehara G., Manangement considerations for acid soils with high phosphorus fixation capacity, The role of Phosphorus in Agriculture, pp. 471-514, (1980)

[29]

Schwertmann U., The differentiation of iron oxide soils by a photochemical extraction with acid ammonium oxalate, Zeitschrift für Pflanzenernährung, Düngung, Bodenkunde, 105, pp. 194-201, (1964)

[30]

Udo E.J., Uzu F.O., Characteristics of phosphorus adsorption by some Nigerian soils, Soil Science Society of America Journal, 36, pp. 879-883, (1972)

← 1 2 3 4 →