Peach, nectarine and flat peach fertilisation

The goal of stone fruit growers is to obtain high yields with excellent quality. Thus, they manage to make their farms profitable.

One of the most important factors is tree nutrition, and this has to be balanced and complete, covering all macro and #microelements throughout the crop cycle.


Brix and calibres

The sugar content (BRIX degrees) in these crops is linked to several nutrients, such as sulphur, potassium, magnesium and #microelements, the lack of any of which hinders the synthesis of these sugars in the fruit.

On the other hand, calibres are conditioned by elements such as sulphur, calcium, zinc and other #microelements.

INPROG manufactures all its fertiliser ranges with the aim of providing a solution for a comprehensive and balanced nutrition and, in particular, to improve Brix degrees and increase calibres.

Fertilisation cases

These four parameters are sought after in stone fruit plantations:

  • Calibre increase: A balanced N-P-K fertilisation, together with the supply of all #microelements and essential elements (#FRpower), activates the primary and secondary metabolism, resulting in higher calibres.
  • Production stability: The supply of #microelements, sulphur and extended-release organic nitrogen increases the tree's reserves for winter dormancy. These reserves have a direct impact on ensuring fruit set and preventing flower and fruit drop. 
  • Strengthening of natural defences: These defences depend on the supply of #FRpower #microelements and essential elements, which stimulate and activate the compounds that act as natural defences. 
  • Brix and colour: Brix and colour are closely linked to potassium and sulphur. That these nutrients are in assimilable forms guarantees the crop’s success. 

Key nutrients

In stone fruit trees, there are four nutritional elements that are key to high yields:


Low potassium content leads to a lack of brix and hinders fruit colour.


Low sulphur content in the soil leads to lower chlorophyll content and reduced fruit colour (polyphenol production).


Zinc deficiency reduces the crop’s yield potential. Low levels considerably reduce the production capacity of complex sugars as well as calibres.


Intensive use of iron chelates blocks iron in the soil. Applying manganese incorporated in organic matter reduces the blocking effect.

The FORTEC-FR and NUBIECOL ranges naturally contain a large amount of these 4 elements, thus providing an easy, direct and efficient solution for fruit tree fertilisation.

Prevention of nutritional deficiencies

In most cases, nutritional deficiencies become visible when the condition is severe. Prior to this, the crop has already undergone stress, which has a direct impact on the yield. It is very important that the most scarce or least available nutrients are always available from the onset of the vegetative cycle.

In stone fruits, they are as follows:

  • Calcium
  • Iron
  • Zinc
  • Manganese
  • Molybdenum
  • Sulphur
  • Strontium
  • Boron

The annual supply of FORTEC-FR and NUBIECOL fertilisers guarantees the correct nutrition of the crop, thus preventing visible or non-visible nutritional deficiencies. The annual supply of all the essential minerals bound to a stable organic matter of noble origin (#multifem) is crucial.

Cumulative effect

The supply, year after year, of the FORTEC-FR and NUBIECOL products improves production both in terms of calibres and kg/ha. This is the conclusion obtained in a trial at IRTA-Mas Badia on the cultivation of apple trees. These results can be applied to all woody crops.

This increase is due to the accumulation, in the soil, of #microelements and essential elements available to the plant. This allows the plant to regulate itself and produce more and better.

Fertiliser benefits

For cultivation

  • Increased fruit set.
  • Prevention of nutritional
  • Extending the productive life of
  • Increase of pieces/tree without reducing calibres from the third year of application.

For the farmer

  • Incorporation of
    assimilable calcium.
  • We provide a large amount
    of #microelements and
    essential minerals. #FRpower
  • We facilitate the management of
    N-P-K fertilisation.

For harvesting

  • Higher calibres.
  • Easier to
    obtain a better colour.
  • Improved Brix degrees.
  • Greater fruit hardness.

Related products

F-FR Complet

Organomineral fertiliser for crops with high potassium and sulphur requirements, together with calcium, microelements and organic matter.

F-FR Standard

Organomineral fertiliser for crops with high potassium requirements, together with calcium, microelements and organic matter.

F-FR Vipo

Organomineral fertiliser for apple and vine growing. It is a single-application fertiliser according to the quantities applied.


Organomineral fertiliser intended for the implantation of all types of crops, especially fruit and woody crops.

Saco de abono organo-mineral y ecológico Gamma Verdor de Inprog


Premium organic fertiliser made from a selection of manures to obtain a superior product.

Saco de abono organo-mineral y ecológico Gamma Verdor de Inprog

Verfor phosca

Organic fertiliser from the ripening of our #starter with bicalcium phosphate.

Saco de abono organo-mineral y ecológico Gamma Verdor de Inprog


Organic sulphur fertiliser from the ripening of our #starter with sulphur.

Saco de abono organo-mineral y ecológico Gamma Verdor de Inprog

V-FR basic

Organic fertiliser from composting manure from controlled and selected farms.

Saco Gamma Nubiecol de Inprog

Nubiecol C

A family of organic fertilisers formulated and designed to achieve high-yield organic crops.

Saco Gamma Nubiecol de Inprog

Nubiecol orgánico

Group of organic fertilisers formulated and designed for crops with high potassium requirements.

Saco Gamma Nubiecol de Inprog

Organic composted manure

Ecological organic fertiliser manufactured as the base of our developed ecological fertilisers. #ECOstarter

Do you need more information?

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Ask our technical support.

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