Spatial Variability of Inorganic Phosphorus Forms in Two Climatic Zones in Jordan
2002
Al-Adaileh, H.A.Kh
Two sites in Jordan: Ajloun and Al-Muwqqar were selected for this study. Three transects in each site were sampled in a 30 × 30 m grid for a total of fifty one soil samples in each site. Ajloun site included variations in slope and land-use which usually reflect on soil properties and the distribution of nutrients in soil, Muwqqar site was more homogenous compare to Ajloun site, leadings to more uniformity in the soil properties and distribution of nutrients. The two sites are in two different climatic zones which reflected different soil characteristics. This study focused on variation of inorganic soil phosphorus forms, total P, nonoccluded Al-and Fe-bound P, Fe occluded P, Ca-bound P and available P. Geostatistical analysis of the data was carried out and semivariogram were plotted to show the spatial variability of the different P forms in the two sits. The results showed more variation than Muwqqar site. This could be due to more factors influencing the P forms in Ajloun site. This study showed gr at variability in all soil phosphorus forms due to variation in topography, land use, and soil management practices. These factors were more dominating in Ajloun site and thus cause more variability in soil P forms. Muwqqar site was more homogenous in many of the factors that could affect the content of the different forms of P in the soil.
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