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Soil Aggregate Size Affects Phosphorus Desorption from Highly Weathered Soils and Plant Growth

^a Dep. of Tropical Plant and Soil Sciences, Univ. of Hawaii, Honolulu, HI, 96822
^b International Rice Research Institute, P.O. Box 933, Manila 1099, Philippines

View larger version (25K): [in a new window]   Fig. 1. Cumulative desorbed P with increased leaching from the Wahiawa, Kapaa, and Leilehua soils. Standard errors of the expanded Elovich equation estimated at mean value were 2.58, 0.59, and 0.09 for the Wahiawa, Kapaa, and Leilehua soils, respectively

View larger version (27K): [in a new window]   Fig. 2. Phosphorus desorption from aggregates size fractions of the Wahiawa, Kapaa, and Leilehua soils after P was applied to the bulk soils. Standard errors of the expanded Elovich equation estimated at mean value for aggregate sizes 0.053 to 0.125, 0.5 to 1, 4 to 6 mm, and bulk soil were 2.85, 2.64, 2.58, and 2.58 for the Wahiawa soil. The values for aggregate sizes 0.125 to 0.25, 1 to 2, 4 to 6 mm, and bulk soil were 0.78, 0.50, 0.59, and 0.59 for the Kapaa soil. The values for aggregate sizes <0.5, 1 to 2, 4 to 6 mm, and bulk soil were 0.19, 0.13, 0.18, and 0.09 for the Leilehua soil

View larger version (26K): [in a new window]   Fig. 3. Effect of aggregate size on P in leachate. A rate of 800 mg P kg-1 was added to separated aggregates of the Leilehua soil

View larger version (21K): [in a new window]   Fig. 4. Effect of aggregate size on the total P in soybean and lettuce shoots on the Leilehua soil. Error bars represent one LSD at . The total P in the lettuce shoots was natural logarithmically transformed

View larger version (22K): [in a new window]   Fig. 5. Relationship between total P in shoots and the difference in 0.5 M NaHCO3-extractable P before planting and after harvesting (Delta P)

View larger version (21K): [in a new window]   Fig. 6. Effect of aggregate size on the root dry weights of soybean and lettuce on the Leilehua soil. Error bars represent one LSD at . The root dry weight of lettuce was logarithmically (natural) transformed

View larger version (19K): [in a new window]   Fig. 7. Effect of aggregate size on the ratio of root to shoot for both soybean and lettuce on the Leilehua soil. Error bars represent one LSD at