Planting-hole application CRF trial Delphy

Viburnum Tinus

In 2019 Delphy started a planting-hole application trial in Viburnum Tinus at Tree nursery Marcel Michels located in Hilvarenbeek. Delphy is a leading internationally operating organization for research and advice in the tree nursery sector. Planting-hole applications with controlled release fertilizers are increasingly used in ornamental tree nurseries.

Partly caused by simple application through mechanization. (planting hole machinery on GPS). Increasing number of tree nurseries have invested in mechanization to reduce labour costs.

Positive experiences in plant quality are just as decisive for the success of this application. Controlled release of nutrition direct in the rootzone is the reason for this success.

Trial setup:
In this trial a distinction is made between controlled released fertilizers and soil stimulants & substrates. In the trial setup of 2019-2020 these objects have been tested separately from each other.

In this report we will focus exclusively on the results of the controlled released fertilizers as planting-hole fertilizer and a non-planting-hole application with mineral-organic fertilizers Object D.

2018
Year before trial is planted
50 tons cattle farmyard manure
Crop: Tagetes

2019
On April 17th P9 young plants “Viburnum tinus” planted in planting holes with a 15 cm diameter. Plant distance 80x50 cm. (19.047 plants / ha).

 

Plant-date

Application

Gram / plant

N / year

1th

17-4-2019

Field-Cote CRF SMART 14+5+11+2MgO+TE 24M

30 gram / plant

40N

2th

17-4-2019

Object I (coated / CRF)

25 gram / plant

40N

3th

17-4-2019

Object H (coated / CRF)

30 gram / plant

40N

4th

Mei 2019/2020

June 2019/2020

Object D (mineral – organic)

Total – 2 years, 4 applications with 160N

800 kg / ha / year

80N

 

End results trial 9-11-2020 (after 2 years)

 

Applications

Plant quality

Root quality

Average length

9-11-2020

1th

Field-Cote CRF SMART

+

+

98 cm

2th

Object I (coated / CRF)

+

+

92 cm

3th

Object H (coated / CRF)

+/-

+/-

89 cm

4th

Object D (mineral-organic)

+

+

90 cm

 

Conclusions
This fertilizer trial shows us that we can achieve better results with 50% less N when we use plant-hole application method with Field-Cote CRF SMART 14+5+11+2MgO+TE 24M
In 2 of the 3 controlled release fertilizer plant hole applications, the results are better than standard application (not in the plant-hole) with mineral-organic (Object D) two times per year.

All objects scored well on rooting, except for Object H. (> 10% failure of plants and lesser quality rooting.)

With planting hole application, you can clearly fertilize more efficiently.

In 2021, Delphy will set up another planting-hole fertilizer application trail at Marcel Michels. This time with Prunus young plantings P9.

Hopefully we will meet during the delphy demo days this year to see the results of this interesting way of fertilization.

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