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Phosphorus Status of Intensively Cropped Soils of the St. Lawrence Lowlands

Suzanne Beauchemin and R.R. Simard

Agriculture and Agri-Food Canada, Soils and Crops Research and Development Centre, 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada, G1V 2J3



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  		Fig. 1 Phosphorus status of the A horizons of the 27 studied sites (bars = SD; M3P, Mehlich-III extractable P; Pw, water-soluble P; Po, organic P; Pt, total soil P; Psi, P sorption index; Pox/(Alox + Feox), P saturation index)

 


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  		Fig. 2 Phosphorus status of the B horizons of the 27 studied sites (bars = SD; M3P, Mehlich-III extractable P; Pw, water-soluble P; Po, organic P; Pt, total soil P; Psi, P sorption index; Pox/(Alox + Feox), P saturation index)

 


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  		Fig. 3 Phosphorus status of the C horizons of the 27 studied sites (bars = SD; M3P, Mehlich-III extractable P; Pw, water-soluble P; Po, organic P; Pt, total soil P; Psi, P sorption index; Pox/(Alox + Feox), P saturation index)

 


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  		Fig. 4 Relationship between the P saturation index and (A) the labile P content or (B) the proportion of labile P content of the A horizons, n = 27 (NS = nonsignificant; *, **, *** significant at {alpha} = 0.05, 0.01 and 0.001, respectively)

 




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