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Growing pumpkins with Haifa fertilizers

Fertilization recommendations for growing pumpkins, depending on various factors and fertilization method

Soil type: Fertile, well-drained soil supplied with organic matter. The ideal pH. is between 6.0 to 7.5, but it will grow on soils with a pH of up to 8.0.
Plant density : 7,000 – 7,500 plants / Ha.
Expected yield: 50 - 75 Ton/ha.

Approximate growth period (strongly dependent on variety and fruit size): 

  1. Miniature, decorative pumpkins, (< 0.5 kg), 95 days.
  2. Small, decorative specialty varieties (0.5 – 2.5 kg), 105 days.
  3. Small to medium (2.5 – 5 kg), 110 days.
  4. Medium to large (5 – 13 kg), 120 days.
  5. Mammoth varieties (50 kg <), 120-130 days.

 

Nutrients requirement (kg/ha)

N

P2O5

K2O

CaO

MgO

110-140

30-45

220-300

90-135

40-60

A. Base-Dressing

Apply at this stage the organic manure (~20 MT/ha), and the following amounts of mineral fertilizers just prior to seeding. In order to reduce the risk of seedling injury from the contact with the fertilizers it is recommended to apply them by broadcasting + disking in, or by splitting the fertilizers in two bands (5 cm if applied at seeding time).

 

Required nutrients (Kg/ha)

Recommended fertilizers (Kg/ha)

N

P2O5

K2O

MgO

AN

SSP

SOP

Epsom salt

55-70

30-45

90-120

20-30

165-210

160-315

36-48

150-230

AN = Ammonium nitrate (33.5% N).
SSP = Single-superphosphate (19% P2O5).
SOP= Potassium Sulfate (50% K2O).
Epsom salt = MgSO4 ( 13% MgO).

B. Side-Dressing

To be applied when vines start to spread

 

 

Required nutrients (Kg/ha)

Recommended fertilizers (Kg/ha)

N

K2O

MgO

AN

Multi-K

Magnisal

55-70

130-180

20-30

15

290-370

125-180

Multi-K = Potassium nitrate (13-0-46).
Magnisal = Magnesium nitrate ( 11-0-0 + 16% MgO).

B. In case fertigation setup is available

The A/M rates should be split into two applications:
1. When the vines start to spread.
2. Some 4 weeks later.

Foliar feeding

Effect of accompanying anion on uptake and translocation of K42 applied on pumpkin leaves (Chamel, 1969).

Potassium source

Uptake of K42 by the plant, 24 h after application (% of activity applied)

Translocation of K42 from the treated leaf (% of activity taken up)

SOP (K2SO4)

19.4

13.2

MKP (KH2PO4)

33.7

15.1

Multi-K (KNO3)

43.3

20.1

To find out more about Haifa Industrial Chemicals, visit Technical KNO3

 

Macro elements removed by 1 ton marketable product

 

N

P

K

Ca

Mg

S

---------------------------------------------------Kg / ton-----------------------------------------

2.5

0.35

3.1

1.0

0.5

0.5