Fertilizer Recommendation Tables - 2010 Revision2010 Revision
Phosphorus and Potassium Requirements
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Soil Phosphorus (0.5 M sodium bicarbonate extract) mg P L-1 of soil (ppm P) | New plantings blueberries, strawberries, raspberries, gooseberries, currants, nursery stock | Established blueberries, strawberries, raspberries, gooseberries, currants, nursery stock | New plantings of apples**, peaches, pears, plums, cherries, grapes |
|---|---|---|---|
| 0-3 |
140 HR
|
100 HR
|
80 HR
|
| 4-5 |
130 HR
|
90 HR
|
60 HR
|
| 6-7 |
120 HR
|
80 HR
|
50 HR
|
| 8-9 |
110 HR
|
70 HR
|
40 MR
|
| 10-12 |
100 HR
|
70 HR
|
20 MR
|
| 13-15 |
90 HR
|
60 HR
|
0 LR
|
| 16-20 |
70 MR
|
50 MR
|
0 LR
|
| 21-25 |
60 MR
|
40 MR
|
0 RR
|
| 26-30 |
50 MR
|
30 MR
|
0 RR
|
| 31-40 |
40 MR
|
20 MR
|
0 RR
|
| 41-50 |
0 H
|
0 RR
|
0 RR
|
| 51-60 |
0 RR
|
0 RR
|
0 RR
|
| 61-80 |
0 NR*
|
0 NR*
|
0 NR*
|
|
80+ |
0 NR*
|
0 NR*
|
0 NR*
|
| Soil Potassium (1 M ammonium acetate extract) mg K L-1 of soil (ppm K) | New or Established blueberries, strawberries, raspberries, gooseberries, currants, nursery stock | New plantings of apples** peaches, pears, plums, cherries | New plantings of grapes*** |
|---|---|---|---|
| 0-15 |
130 HR
|
180 HR
|
270 HR
|
| 16-30 |
120 HR
|
170 HR
|
270 HR
|
| 31-45 |
110 HR
|
160 HR
|
270 HR
|
| 46-60 |
100 HR
|
140 HR
|
270 HR
|
| 61-80 |
90 HR
|
110 HR
|
270 HR
|
| 81-100 |
80 HR
|
70 MR
|
270 HR
|
| 101-120 |
70 MR
|
40 MR
|
270 HR
|
| 121-150 |
60 MR
|
20 MR
|
270 MR
|
| 151-180 |
40 MR
|
0 LR
|
270 MR
|
| 181-210 |
0 LR
|
0 LR
|
270 MR
|
| 211-250 |
0 RR
|
0 RR
|
270 LR
|
|
250+ |
0 NR*
|
0 NR*
|
270 LR
|
* adding nutrients to soils with these levels of nutrients may reduce crop yields or quality by interfering with the uptake of other nutrients.
** For established tree fruits and grapes there will be no print-out of N, P and K requirements. Plant analysis is used to estimate requirements for established tree fruits and grapes.
*** Apply only every second year.
HR, MR, LR, RR, and NR denote, respectively, high, medium, low, rare and no probabilities of profitable crop response to applied nutrient.
Approved: Ontario Soil Management Research and Services Committee (June 2010).
| | Fertilizer Recommendation Tables - Table of Contents | |
|
For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
| Author: | Keith Reid - Soil Fertility Specialist/OMAFRA |
|---|---|
| Creation Date: | October 2007 |
| Last Reviewed: | February 2011 |