Volume 7, Issue 3 (fall 2003)
jwss 2003, 7(3): 119-128 |
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Sh. Mahmood-Soltani, A. Samadi. Determination of Phosphorus Fractions in Some Calcareous Soils in Fars Province and their Relationships with Soil Physico-chemical Properties. jwss 2003; 7 (3) :119-128
URL: http://jstnar.iut.ac.ir/article-1-448-en.html
URL: http://jstnar.iut.ac.ir/article-1-448-en.html
Abstract: (28516 Views)
Knowledge of forms of phosphorus (P) is important in the evaluation of soil P status and also in understanding soil genesis and fertility. Amounts and distribution of P in different organic and inorganic fractions were examined in 39 soil samples of Fars province. Soils were sequentially extracted to determine organic P and inorganic P fractions.
Total P with an average of 597 mg/kg soil was lower in the light soils (482 mg/kg) as compared with the heavy soils (690 mg/kg). Organic P constituted considerable portions of TP (27%). Calcium phosphates with an average of 424 mg/kg soil and being comprised of 71% inorganic P was the dominant form of soil phosphorus. Simple regression analysis indicated that there were significant positive relationships between organic P, Ca phosphates and Al-Fe phosphate values with CEC and clay content. Stepwise multiple regression analysis showed that a combination of soil properties such as clay content and equivalent calcium carbonate (CCE) increased correlation coefficients (R). Alghough multiple regression model was significant (at P<0.05), the relative contribution of each soil property in Al-Fe-P fraction was not considerable.
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