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Soil Development and Fertility Characteristics of a Volcanic Slope in Mindanao, the Philippines

^a Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616 USA
^b Dep. of Crop and Soil Sciences, Miller Plant Sciences Building Room 3111, Univ. of Georgia, Athens, GA 30602 USA

View larger version (18K): [in a new window]   Fig. 1 Langmuir adsorption isotherms for P sorption of the surface layers of selected pedons (a) Pedon 3 (b) Pedon 4 (c) Pedon 10 and (d) Pedon 13 representing the mountains, the upper footslopes, the lower footslopes and the alluvial terraces, respectively; Pa is the amount of P sorbed by unit weight of soil and C is the concentration of P remaining in solution

View larger version (17K): [in a new window]   Fig. 2 Immediate quantity/intensity (Q/I) relations for K of the surface layers of selected pedons (a) Pedon 3 (b) Pedon 4 (c) Pedon 10 and (d) Pedon 13 representing the mountains, the upper footslopes, the lower footslopes and the alluvial terraces, respectively; K is a measure of labile K, and ARK is the activity ratios (aK/(a Ca+Mg)1/2)

View larger version (12K): [in a new window]   Fig. 3 Relationships between Potential Buffering Capacity (PBCK) for K and soil pH