Below is a canola (Brassica napus L.) tissue nutrient sufficiency table by growth stage, including macronutrients (nitrogen, phosphorus, potassium, calcium, magnesium, sulfur), micronutrients (boron, copper, iron, manganese, zinc, molybdenum), leaf water content (LWC), and Brix values. These values are based on leaf tissue analysis (typically the youngest fully expanded leaf) and are derived from agricultural research, such as guidelines from the Canola Council of Canada, University of Manitoba, and other canola-growing regions, adjusted for canola physiology.
Growth stages are simplified into the following:
- Vegetative (rosette to stem elongation)
- Bud Formation (pre-flowering)
- Flowering (bloom)
- Pod Development to Maturity (pod fill to ripening)
- Harvest
Nutrient concentrations are in percentages (%) for macronutrients and parts per million (ppm) for micronutrients, with LWC as a percentage of fresh weight and Brix (°Bx) as soluble solids in sap.
Growth Stage |
N (%) |
P (%) |
K (%) |
Mg (%) |
Ca (%) |
S (%) |
||||||
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
|
Vegetative |
4.00 |
5.50 |
0.30 |
0.60 |
2.50 |
3.50 |
0.30 |
0.60 |
1.00 |
2.00 |
0.60 |
1.00 |
Bud Formation |
3.50 |
4.50 |
0.30 |
0.50 |
2.00 |
3.00 |
0.30 |
0.60 |
1.50 |
2.50 |
0.50 |
0.90 |
Flowering |
3.00 |
4.00 |
0.20 |
0.40 |
1.80 |
2.50 |
0.30 |
0.60 |
1.50 |
2.50 |
0.50 |
0.80 |
Pod Fill to Maturity |
2.50 |
3.50 |
0.20 |
0.40 |
1.50 |
2.00 |
0.30 |
0.60 |
1.00 |
2.00 |
0.40 |
0.70 |
Harvest |
2.00 |
3.00 |
0.15 |
0.30 |
1.00 |
2.00 |
0.20 |
0.40 |
1.00 |
1.50 |
0.30 |
0.50 |
B (ppm) |
Zn (ppm) |
Mn (ppm) |
Fe (ppm) |
Cu (ppm) |
Mo (ppm) |
|||||||
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
|
Vegetative |
20 |
50 |
20 |
60 |
20 |
100 |
50 |
150 |
5 |
15 |
0.10 |
1.00 |
Bud Formation |
25 |
60 |
20 |
60 |
20 |
100 |
50 |
150 |
5 |
15 |
0.10 |
1.00 |
Flowering |
30 |
70 |
20 |
60 |
20 |
100 |
50 |
150 |
5 |
15 |
0.10 |
1.00 |
Pod Fill to Maturity |
20 |
50 |
20 |
60 |
20 |
100 |
50 |
150 |
5 |
15 |
0.10 |
1.00 |
Harvest |
15 |
30 |
15 |
50 |
20 |
75 |
30 |
100 |
4 |
10 |
0.10 |
0.80 |
LWC |
BRIX |
|||||||||||
Min |
Max |
Min |
Max |
|||||||||
Vegetative |
85 |
90 |
8 |
12 |
||||||||
Bud Formation |
80 |
88 |
10 |
15 |
||||||||
Flowering |
78 |
85 |
12 |
18 |
||||||||
Pod Fill to Maturity |
75 |
82 |
8 |
14 |
||||||||
Harvest |
70 |
78 |
8 |
12 |
Scanning Recommendation:
- Ensure that over 25% of the scan bed is covered with a single layer of vegetation.
- Leaf selection should be similar to this illustration.