Agronomic Thresholds for Soil Phosphorus in Alberta: Appendix - Calculated Crop Response to Add for Alberta Soils

 
 
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 Table 1. Crop response to added P (control as percent of maximum treatment yield) for individual soils of Alberta (data from McKenzie et al. 1995).
Soil test P (ppm)
Canola
Barley
Wheat
Average for all soil zones
 
 
10
71.1
75.3
77.6
20
82.0
85.1
86.6
30
86.4
88.9
90.1
40
88.8
91.0
92.0
50
90.3
92.3
93.1
60
91.4
93.2
93.9
70
92.1
93.8
94.5
80
92.7
94.3
94.9
90
93.1
94.7
95.3
100
93.5
95.0
95.5
Luvisolic soils
10
55.4
55.9
68.2
20
70.7
71.7
79.5
30
77.8
79.2
84.2
40
81.9
83.5
86.7
50
84.6
86.3
88.3
60
86.5
88.3
89.4
70
87.9
89.8
90.2
80
89.0
91.0
90.8
90
89.9
91.9
91.3
100
90.6
92.6
91.7
Dark Gray soils
10
55.7
70.4
78.7
20
70.5
81.6
87.2
30
77.4
86.2
90.5
40
81.3
88.7
92.2
50
83.9
90.2
93.2
60
85.7
91.3
94.0
70
87.1
92.1
94.5
80
88.1
92.7
94.9
90
88.9
93.2
95.2
100
89.6
93.5
95.4

Soil test P (ppm)
Canola
Barley
Wheat
Black soils
10
71.2
79.2
80.3
20
83.6
88.0
88.8
30
88.8
91.3
92.0
40
91.6
93.1
93.7
50
93.4
94.2
94.8
60
94.6
95.0
95.5
70
95.5
95.5
96.0
80
96.2
95.9
96.4
90
96.8
96.3
96.8
100
97.2
96.5
97.0
Thin Black soils
10
90.3
79.0
80.3
20
91.5
87.4
86.9
30
91.9
90.7
89.3
40
92.1
92.4
90.6
50
92.3
93.4
91.4
60
92.3
94.1
91.9
70
92.4
94.6
92.3
80
92.5
95.0
92.5
90
92.5
95.3
92.8
100
92.5
95.6
93.0
Dark Brown soils
10
86.4
79.7
72.3
20
90.0
86.6
84.6
30
91.2
89.2
89.7
40
91.9
90.6
92.5
50
92.3
91.5
94.2
60
92.6
92.0
95.4
70
92.7
92.4
96.3
80
92.9
92.7
97.0
90
93.0
93.0
97.5
100
93.1
93.2
97.9
Brown soils
10
 
88.2
95.1
20
 
91.7
95.6
30
 
92.9
95.8
40
 
93.5
95.9
50
 
93.9
95.9
60
 
94.1
96.0
70
 
94.3
96.0
80
 
94.4
96.0
90
 
94.6
96.0
100
 
94.6
96.1
  
 
 
 

Other Documents in the Series

  
  Agronomic Thresholds for Soil Phosphorus in Alberta: A Review
 Agronomic Thresholds for Soil Phosphorus in Alberta: Introduction
 Agronomic Thresholds for Soil Phosphorus in Alberta: Basis for Fertilizer Recommendations in Alberta
 Agronomic Thresholds for Soil Phosphorus in Alberta: Implications for Management of Organic P Sources
 Agronomic Thresholds for Soil Phosphorus in Alberta: Conclusions
 Agronomic Thresholds for Soil Phosphorus in Alberta: References
Agronomic Thresholds for Soil Phosphorus in Alberta: Appendix - Calculated Crop Response to Add for Alberta Soils - Current Document
  
 
 
 
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For more information about the content of this document, contact Ralph Wright.
This document is maintained by Laura Thygesen.
This information published to the web on June 25, 2003.
Last Reviewed/Revised on January 16, 2015.