Extractability of Added Phosphorus in Short-Term ... - PubAg - USDA
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Extractability of Added Phosphorus in Short-Term ... - PubAg - USDA
to cover a wide variation in soil properties and P sorption (Table 1). The sampling was conducted at different sites in the northern, central, and southern Portugal.
Extractability of Added Phosphorus in Short-Term Equilibration Tests of Portuguese Soils R. Indiati,a U. Neri,a A. N. Sharpley,b and M. L. Fernandesc
als tit uto Sperimentale per la Nutrizione del/c Piante, Via della Navicella 2, 00184 Roma, Italy b USDA .AP Pasture Systems and Watershed Research Laboratory, Curtin Road, University Park, PA 16802-3702 clnstituto Superior De Agronomia, Tapada da Ajuda 1399, Lisboa, Portugal
ABSTRACT As soil phosphorus (P) availability changes with soil type and time after fertilizer application, use of a P availability index, "F" (fraction of added P remaining available after a given time), was evaluated for 28 Portuguese soils as a function of soil P extractant (Egner, Fe-oxide strip, Mehlich 3, and Olsen). The F index values, based on a short-term P recovery after 2-h and 24-h soil-P equilibration periods, were related to longer-term F values determined after a 90 day soil-P equilibration of soil and P (r=0.87 to 0.98; P
