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Soil Variables for Predicting Potential Phosphorus Release in Swedish Noncalcareous Soils

^a Department of Soil Sciences, Swedish University of Agricultural Sciences, P.O. Box 7014, SE-750 07 Uppsala, Sweden
^b Dipartimento di Valorizzazione e Protezione delle Risorse Agroforestali, University of Turin, Via Leonardo da Vinci 44, I-10095 Grugliasco (TO), Italy

View larger version (28K): [in a new window]   Fig. 1. Changes in ammonium lactate–extractable phosphorus (P-AL) as influenced by repeated cropping and fertilization. Level A, no P added; Level B, replacement of P; Level C, replacement + 15 or 20 kg P; Level D, replacement + 30 kg P.

View larger version (31K): [in a new window]   Fig. 2. The CaCl2–extractable total phosphorus (CaCl2–TP) in relation to soil test phosphorus (STP) as determined by (a) NaHCO3–extractable phosphorus (Olsen P) and (b) ammonium lactate–extractable phosphorus (P-AL).

View larger version (17K): [in a new window]   Fig. 3. Effect of maximum phosphorus sorption capacity (PSCmax) on relationship between potential P release and soil test phosphorus (STP). The term * indicates significance at the 0.05 probability level, while ** indicates significance at the 0.01 probability level.

View larger version (14K): [in a new window]   Fig. 4. Changes in relative content of CaCl2–extractable unreactive phosphorus (CaCl2–UP) promoted by CaCl2–extractable total phosphorus (CaCl2–TP) levels.

View larger version (19K): [in a new window]   Fig. 5. Relationship between CaCl2–extractable total phosphorus (CaCl2–TP) or CaCl2–extractable reactive phosphorus (CaCl2–RP) and the ratio of NaHCO3–extractable phosphorus (Olsen P) to phosphorus sorption index (PSI) or ammonium lactate–extractable phosphorus (P-AL) to PSI. The term *** indicates significance at the 0.001 probability level.