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A complete fertilization program for onion

Haifa's fertilization & fertigation recommendation for growing onions with Haifa fertilizers, to achieve optimal plant nutrition and excellent yield

Situation A

Growing medium: Open field.
Soil type: Light.
Plant population: 200,000-400,000 Plants/Ha.
Expected yield: 40-60 T/Ha (85% moisture).

 

N

P2O5

K2O

---------------- Kg/Ha -----------------

100-200

100-200

200-300

 

 

 

 

Base dressing

 

Nutrient demand

Recommended fertilizers

N

P2O5

K2O

MgO

Multi-K

SSP

Magnisal

-------------- Kg/Ha --------------

-------------- Kg/Ha --------------

37

120

90

16

200

650

100

 

 

Due to shallow root system the fertilizers should be banded 8-10 cm below the seed row.

 

 

 

Fertigation

 

Weeks after transplanting

Nutrient requirements

Recommended fertilizers

N

P2O5

K2O

Ca

Multi-K

AN

CN

-------------- Kg/Ha --------------

-------------- Kg/Ha --------------

2-6

14

   

0.9

 

40

4.5

8-12

6.5

 

23

 

50

   

 

 

High nutrient availability is required during the bulbification.

 

AN = Ammonium nitrate (34% Nitrogen)
Multi-K = Potassium nitrate (13-0-46)
SSP = Single Superphosphate (19% P2O5)
Magnisal = Magnesium nitrate ( 10.8-0-0-+15.7MgO)

 

 

 

Situation B

Growing medium: Open field.
Soil type: Light to medium.
Plant population: 800,000-1,000,000 Plants/Ha.
Expected yield: 65-70 MT/Ha (85% moisture).

 

 

 

Recommended average rates of nutrients for onions

 

N

P2O5

K2O

---------------- Kg/Ha -----------------

170-200

200-300

400-500

 

 

 

 

Base dressing

 

Nutrient demand

Recommended fertilizers

N

P2O5

K2O

MgO

Multi-K

SSP

Magnisal

-------------- Kg/Ha --------------

-------------- Kg/Ha --------------

85

270

300

37

600

1400

230

 

 

Multi-K - Potassium nitrate (13% N and 46% K2O).
SSP - Single Superphosphate (19% P2O5).

 

 

 

Side-Dressing

 

 

N

K2O

Multi-K

Ammonium Nitrate

Calcium nitrate

Developmental stage

(Kg/Ha)

(Kg/Ha)

(Kg/Ha)

(Kg/Ha)

(Kg/Ha)

2 weeks after transplanting

30

70

150

0

0

Bulb filling

60

70

150

20

150

 

 

Note: It is recommended not to apply nitrogen after the bulb is 2/3 of its expected final size.

 

Multi-K - Potassium nitrate (13% N and 46% K2O).
Calcium nitrate (15.5% N and 20% Ca).

 

Need more information about growing onions? You can always return to the onion fertilizer & onion crop guide table of contents