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Changes in Phosphorus Fractions in Soils under Intensive Plant Growth

Dep. of Tropical Plant and Soil Science, Univ. of Hawaii, 1910 East West Rd., Honolulu, HI 96822 USA

View larger version (30K): [in a new window]   Fig. 1 Changes in inorganic strip- and NaHCO3–P in eight soils under exhaustive cropping. Phosphorus was added in each soil to raise soil solution P to 0.2 mg L-1. Honouliuli, Lualualei, and Nohili were considered low P sorption soils and Paaloa and Wahiawa were medium P sorption soils, while the Kapaa, Leilehua, and Mahana soils were characterized by high P sorption

View larger version (18K): [in a new window]   Fig. 2 Changes in NaOH-Pi in eight soils under exhaustive cropping. Phosphorus was added in each soil to raise soil solution P to 0.2 mg L-1. Honouliuli, Lualualei, and Nohili were considered low P sorption soils and Paaloa and Wahiawa were medium P sorption soils, while the Kapaa, Leilehua, and Mahana soils were characterized by high P sorption

View larger version (32K): [in a new window]   Fig. 3 Changes in organic P in eight soils under exhaustive cropping. Phosphorus was added in each soil to raise soil solution P to 0.2 mg L-1. Honouliuli, Lualualei, and Nohili were considered low P sorption soils and Paaloa and Wahiawa were medium P sorption soils, while the Kapaa, Leilehua, and Mahana soils were characterized by high P sorption

View larger version (14K): [in a new window]   Fig. 4 Changes in HCl-P in eight soils under exhaustive cropping. Phosphorus was added in each soil to raise soil solution P to 0.2 mg L-1. Honouliuli, Lualualei, and Nohili were considered low P sorption soils, Paaloa and Wahiawa were medium P sorption soils, while the Kapaa, Leilehua, and Mahana soils were characterized by high P sorption

View larger version (17K): [in a new window]   Fig. 5 Changes in residual P in eight soils under exhaustive cropping. Phosphorus was added in each soil to raise soil solution P to 0.2 mg L-1. Honouliuli, Lualualei, and Nohili were considered low P sorption soils and Paaloa and Wahiawa were medium P sorption soils, while the Kapaa, Leilehua, and Mahana soils were characterized by high P sorption