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Phosphorus in Hawaiian Kikuyugrass Pastures and Potential Phosphorus Release to Water

^a College of Agriculture, Forestry, and Natural Resource Management, University of Hawai'i at Hilo, 200 West Kawili Street, Hilo, HI 96720-4091
^b Department of Human Nutrition, Food, and Animal Sciences, College of Tropical Agriculture and Human Resources, University of Hawai'i at Manoa, 1955 East-West Road, Honolulu, HI 96822
^c Agronomy Department, University of Florida, Gainesville, FL 32611-0500
^d Biochemistry Department, Iowa State University, Ames, IA 50011

View larger version (20K): [in a new window]   Fig. 1. Relationship between kikuyugrass P concentration and modified-Truog-extractable phosphorus (PMT) for the 0- to 16-cm sampling depth exclusive of the Mollisol outliers (denoted by open circles). ***Significant at the 0.001 probability level.

View larger version (25K): [in a new window]   Fig. 2. Relationship between water-extractable, dissolved (<0.45-µm pore diameter), molybdate-reactive soil phosphorus (DRPWE) and modified-Truog-extractable phosphorus (PMT) for the 0- to 4-cm sampling depth. ***Significant at the 0.001 probability level.

View larger version (16K): [in a new window]   Fig. 3. Relationship between water-extractable, dissolved (<0.45-µm pore diameter), molybdate-reactive soil phosphorus (DRPWE) and the soil phosphorus saturation index calculated using oxalate-extractable iron, aluminum, and molybdate-reactive phosphorus (PSIoxRP). ***Significant at the 0.001 probability level.

View larger version (16K): [in a new window]   Fig. 4. Relationship between water-extractable, dissolved (<0.45-µm pore diameter), molybdate-reactive soil phosphorus (DRPWE) and a soil phosphorus saturation index estimated from modified-Truog-extractable iron, aluminum, and phosphorus (PSIMT). ***Significant at the 0.001 probability level.

View larger version (16K): [in a new window]   Fig. 5. Relationship between a soil phosphorus saturation index estimated from modified-Truog-extractable iron, aluminum, and phosphorus (PSIMT) and the soil phosphorus saturation index calculated using oxalate-extractable iron, aluminum, and molybdate-reactive phosphorus (PSIoxRP). ***Significant at the 0.001 probability level.