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Pioneering the Future

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Fertilization of delphinium in greenhouse soilless growing conditions

 

Our complete fertilization recommendation for growing beautiful delphiniums

 

Growing conditions: Greenhouse, soilless.
Growing medium: scoria, crushed to about ¼ inch diameter, or pumice of a similar size to be an ideal growing medium.
Water time obviously varies from day to day and season to season, according to the plant's needs. It should be noted that, in order to keep salts to a level which delphinium will tolerate (relatively low) it is necessary to flush the plants with water for about half an hour at least once a week.


The recipe is for fertilizers to be mixed into a 20,000 liter tank and watered out as is. No dilution is required. Fertigation being applied until the trays in which the delphinium plants were growing were saturated, and water began to seep out of the drain holes in the trays.

 

 

 

Summer feed

 

Fertilizer per 20,000 litres

Total

N

P

K

S

Mg

Ca

Multi-K 13-0-46

3 kg

0.39

 

1.38

     
Pot. Sulphate

1 kg

   

0.50

0.23

   
Cal. Nit. 15.5 - (19%C)

15 kg

2.33

       

2.85

Ammonium. Nit. 34.5 %

4 kg

1.38

         
Magnesium Sulphate

1 kg

       

0.50

 
Magnisal 11.0.0.15

2 kg

0.22

     

0.30

 
Multi-Keep 0-52-34

3 kg

 

1.53

0.99

     
Iron Chelate

450 gm

           
Borax

20 gm

           
Zinc. Sulphate

10 gm

           
Manganese. Sulphate

10 gm

           
Sodium. Molibdate

0.7 gm

           
Copper. Sulphate

0.5 gm

           
Total

Total

4.32

1.53

2.87

0.23

0.80

2.85

 

Ratio

2.82

1

1.88

0.15

0.52

1.86

 

ppm

216

77

144

12

40

143

 

 

 

 

Water feed

 

Fertilizer per 20,000 litres

Total

N

P

K

S

Mg

Ca

Multi-K 13-0-46

3 kg

0.39  

1.38

     
Pot. Sulphate

1.5 kg

   

0.75

0.35

   
Cal. Nit. 15.5 - (19%C)

14 kg

2.17        

2.85

Ammonium. Nit. 34.5 %

1 kg

0.35          
Magnesium Sulphate

1 kg

       

0.50

 
Magnisal 11.0.0.15

0 kg

0.00      

0.00

 
Multi-Keep 0-52-34    

 1.02

0.66

     
Iron Chelate              
Borax              
Zinc. Sulphate              
Manganese. Sulphate              
Sodium. Molibdate              
Copper. Sulphate              
Total

Total

2.91

1.02

2.79

0.35

0.50

2.85

 

Ratio

2.85

1

2.74

0.34

0.49

 
 

ppm

145

51

140

17

25

 

 

 

Source: Dowdeswellw's Delphiniums