PHOSPHORUS FRACTIONS AS CORRELATED TO SOME SOIL PROPERTIES IN SOME SOIL SERIES OF EGYPT | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 3, Volume 32, Issue 3, March 2007, Pages 2361-2371 PDF (750.35 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2007.201117 | ||
| Authors | ||
| F. A. Hellal1; A. A. M. Ragab2 | ||
| 1Plant Nutrition Dept., National Research Centre, Dokki, Giza, Egypt. | ||
| 2Soil, Water and Environ. Res. Inst., Agric. Res. Centre, Giza, Egypt. | ||
| Abstract | ||
| Characterization study were carried out to evaluate the relationship between total, organic and inorganic P fractions and some physicochemical properties of six soil series representing the main soil types of Egypt (typic torri fluvents, typic haplucalcids and typic torri psaments). The obtained results could be summarized as follows: The inorganic P fractions, i.e, saloid, Al-P, Fe-P, occluded P and Ca-p in soil series varied from 2.85 to 22.8, 30 to 164, 8.2 to 28.0, 24.7 to 130.9, and 121 to 871 mg kg-1, respectively. Ca-P contributed to 71.5 % of total inorganic P and 1.13 % only for saloid P. The abundance of different inorganic P forms was in the order Ca-P> Occluded P > Al-P> Fe-P> saloid P suggesting that, Ca-P and occluded P are the major P fractions to contribute P nutrition by plants. The fractions of Ca-P and Occluded P found to be positively coinciding with CEC and OM and negatively with pH and CaCO3 responsible for P precipitation over P adsorption as CaCO3 and pH increased in soil. Whereas, Al-P fraction were mainly associated with clay and organic matter content of soils. The higher contents of organic P in the soils of Minia and Giza could be due to heavy later addition of P fertilizer and high organic matter as compare to other soil series. The inorganic P fractions contributed to 89.4 % of total P and 10.6 % only for organic P in the studied soil series. Total P content ranged from 255 to 1300 mg kg-1 in South Tahrir and Giza. However, available P ranged from 6.65 to 29.2 mg kg-1 depending on soil properties. In most soil series, soil content of available P is higher in Giza, Minia and Gazert Uddhab and marginal in Janaklis and South Tahrir. Highly significant positive correlation was found between available and total P of most of the studied soil and each of clay + silt, CEC, OM and available water, whereas significant negative correlation was found with sand and pH. | ||
| Keywords | ||
| organic P; available P; soil properties; soil series; Al-p; Ca-p; Occluded P | ||
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