Phosphorus Fractions of Selected Calcareous Soils of Qazvin Province and Their Relationships with Soil Characteristics

Document Type : Research Paper

Authors

1 Ph.D. Student College of Agric., Tehran Univ. Tehran, Iran and Scientific member of Agricultural Research Center of Qazvin, Iran

2 Assoc. Prof of Soil Sci., College of Agric, Tehran Univ. Tehran, Iran

3 Prof. of Soil Sc., College of Agric., Shiraz Univ. Shiraz, Iran

4 Assist. Prof of Soil Sc.,-Soil and Water Research Institute. Tehran, Iran

5 Assist. Prof of Soil Sci., College of Agric, Tehran Univ. Tehran, Iran

Abstract

Information about phosphorus fractions  is important for evaluation of their status in soil and understanding  of soil chemistry that influence soil fertility. To  obtain such information, amount   and distribution of  P   in  different fractions  of 20 soil samples  of Qazvin province,  Iran were determined  by sequential  extraction   methods  and their relationships  with  each  other and with soil characteristics  were investigated. Total P ranged  from 700 to 1040 mg kg-1.  The clay ranged  from 18-52%,  CEC from 14.5-33.5  c mol(c)   kg-1 and the active CaCO3  from 2.9-19.4%. The amount of different P forms  i.e. dicalcium   phosphates (Ca2-P), octacalcium  phosphates (Ca8-P), Al- phosphates (Al-P),  Fe- phosphates (Fe-P), occluded-P  (O-P), and P as apatite (Ca10-P)  were found to range  from; 1.6-42.3,  72-314,  14.5-54.8,  8.4-34.8, 5.9-33.4 and 262-697 mg kg-1, respectively. Simple correlation coefficients showed that Olsen-P had a significant  correlation  with soluble-P,  Ca2-P, Fe-P and O-P. A significant  correlation  was also observed among different forms of P, which presumably  reflects  the existence of a dynamic relation  between the chemical forms  of an element  in soil. Clay with Fe-P  and O-P; total P with Ca8-P, Al-P and Ca10-P;  and CEC with Al-P and O-P had positive   and significant correlations.   However,   a  significantly negative  correlation   was found for electrical  conductivity   (EC) with Ca8-P  and Al-P; organic  carbon (OC) with Ca10-P, and active CaCO3  with Ca10-P.

Keywords

References

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Iranian Journal of Soil Research
Volume 23, Issue 1
March 2009
Pages 11-22

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