|
|
Stage of Growth |
||||
|
Nutrient |
Transplant to 1st cluster |
1st cluster to 2nd cluster |
2nd cluster to 3rd cluster |
3rd cluster to 5th cluster |
5th cluster to termination |
|
|
Final delivered nutrient solution concentration (ppm) |
||||
|
N |
70 |
80 |
100 |
120 |
150 |
|
P |
50 |
50 |
50 |
50 |
50 |
|
K |
120 |
120 |
150 |
150 |
200 |
|
Ca |
150 |
150 |
150 |
150 |
150 |
|
Mg |
40 |
40 |
40 |
50 |
50 |
|
S |
50 |
50 |
50 |
60 |
60 |
|
Fe |
2.8 |
2.8 |
2.8 |
2.8 |
2.8 |
|
Cu |
0.2 |
0.2 |
0.2 |
0.2 |
0.2 |
|
Mn |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
|
Zn |
0.3 |
0.3 |
0.3 |
0.3 |
0.3 |
|
B |
0.7 |
0.7 |
0.7 |
0.7 |
0.7 |
|
Mo |
0.05 |
0.05 |
0.05 |
0.05 |
0.05 |
|
EC[40] |
0.7 |
0.9 |
1.3 |
1.5 |
1.8 |
|
Ca and S concentrations may vary depending on Ca and Mg concentrations in well water and amount of sulfuric acid used for acidification. |
|||||
Table 4. Nutrient solution concentrations and EC recommeded for tomato production in rockwool in Ontario, Canada greenhouses. Numbers in bold denote changes from previous stage.
|
|
Stage of Growth |
|||
|
Nutrient |
Saturation of slabs |
For 4-6 weeks after planting |
Normal Feed |
Heavy fruit load |
|
|
Final delivered nutrient solution concentration (ppm) |
|||
|
N |
201 |
238 |
200 |
203 |
|
P |
62 |
62 |
62 |
62 |
|
K |
253 |
370 |
370 |
390 |
|
Ca |
247 |
190 |
190 |
190 |
|
Mg |
36 |
36 |
36 |
36 |
|
Fe |
0.8 |
0.8 |
0.8 |
0.8 |
|
Cu |
0.57 |
0.57 |
0.57 |
0.57 |
|
Mn |
0.32 |
0.32 |
0.32 |
0.32 |
|
Zn |
0.22 |
0.22 |
0.22 |
0.22 |
|
B |
0.1 |
0.1 |
0.1 |
0.1 |
|
Mo |
0.005 |
0.005 |
0.005 |
0.005 |
|
EC |
2.5 |
Up to 3.5 |
1.8-2.3 |
1.8-2.5 |
|
Ca and S concentrations may vary depending on Ca and Mg concentrations in well water and amount of sulfuric acid used for acidification. |
||||