Yield Increase in Onion

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Through Agrology Success Stories in Greece and Abroad, it is proven that the superior quality and integrated innovative technologies of Agrology’s Functional Crop Nutrition® products, make a difference in crops from the very first applications!

Our goal is to demonstrate that application programs with Agrology’s Functional Crop Nutrition® products are an obvious investment for producers, as the financial benefits exceed the cost of supplemental applications!

One such Success Story was carried out on Onion, var. Red Cross (SS 2025_216_GR) in Thiva, in collaboration with the agricultural store “Papadas Panagiotis”, in 2025. Throughout the process, the farmer benefited from the continuous guidance and support offered by Agrology’s Technical Department and the collaborating agricultural store.

The field was divided into two plots, one was used as the Control, while Agrology’s Program was applied to the other plot. In both plots, the farmer used the same plant protection and plant nutrition-fertilization program, apart from the additional applications with Agrology’s Functional Crop Nutrition® products.

Identity of Success Story

Partner: Papadas Panagiotis

Farmer: Sdonas Loukas

Location: Thiva, Viotia

Cultivation Season: 2025

Cultivation: Onion, var. Red Cross

Success Story area: 1 + 0.2 ha (Agrology + Control)

Sowing Date: 28/01/2025

Harvest Day: 06/08/2025

Plant protection: Same for the entire area

Irrigation: Sprinklers

Success Story Goals

By applying Agrology’s Functional Crop Nutrition® products during specific growth stages, the farmer can achieve significant agronomic benefits for the crop.

The main Objectives of this Success Story were as follows:

  • Onion Bulb Size and Weight Increase
  • Total Yield Increase

Agrology Functional Crop Nutrition® Program – Onion, var. Red Cross

Agrology Functional Crop Nutrition® Program – Onion, var. Red Cross
Picture 1. AGROLOGY Functional Crop Nutrition® Program

Functional Crop Nutrition® Program – Agrology Supplementary Applications


Functional Crop Nutrition® Products

Protonic Quattro Logo
BIO Farming Logo - ladybug

Protonic® Quattro is a holistic Biostimulant containing 50% extracts of Laminaria digitata and Ascophyllum nodosum algae, along with a 20% mixture of L-amino acid hydrolyzed proteins. It is further fortified with Molybdenum (Mo), Cobalt (Co), and Carboxylic Acids.

  • Enhancement of plant resistance to abiotic stress
  • Improved crop establishment
  • Improved nitrogen metabolism and better utilization of soil phosphorus compounds

Application timing:

  • Vegetative Development (3rd – 4th Leaf)

Recommended Dosage

  • Foliar – 1 L/ha
Fruitonic Base bio logo
BIO Farming Logo - ladybug

Bio-activator formulated with a 47% mixture of 20 biologically active, vegetable L-amino acids derived from enzymatic hydrolysis and Organic Nitrogen, alongside a 35% refined extract of Leonardite, featuring a natural ratio of Fulvic to Humic acids at 30:70. Enriched with an 18% mixture of Carboxylic Acids and Organic Prebiotics of high biological value.

  • Plant tolerance to abiotic stress
  • Improvement of vegetative and root development
  • Improvement of soil structure, aeration, and water-holding capacity
  • Enhancement of nutrient uptake and utilization

Application timing:

  • Vegetative Development (3rd – 4th Leaf)
  • Onset of Onion Bulb Formation

Recommended Dosage

  • Fertigation – 20 L/ha
XGel activ Sapphire logo

25-25-25+4SiO2​ + TE

Highly Concentrated Functional Crop Nutrition® product, with a balanced NPK ratio, in the form of a thixotropic Gel, with Bioavailable Silicon of the E-PerForm® Technology.

  • Improvement of vegetative and root development
  • Enhancement of plant resistance to abiotic stress

Application timing:

  • Vegetative Development (4th – 5th Leaf)

Recommended Dosage

  • Foliar – 3 L/ha
Suprafix MoBoZin Logo Bio

Highly concentrated liquid Boron and Zinc in suspension concentrate form and reinforced with Molybdenum (Mo: 1% w/v, B: 15% w/v, Zn: 30% w/v)

  • Promotion of Vegetative Growth
  • Increased photosynthetic capacity

Application timing:

  • Vegetative Development (4th – 5th Leaf)

Recommended Dosage

  • Foliar – 1 L/ha
Titonic Carpophos logo

Functional Crop Nutrition® product, in the form of a Concentrated liquid susposolution. It is abundant in Phosphorus and Calcium, and enriched with the bioactive Titanium of the E-PerForm® Technology (N: 4%, P2O5 : 32%, CaO: 6%).

  • Increase in the size and weight of newly formed bulbs
  • Improvement in bulb firmness

Application timing:

  • Onset of Onion Bulb Formation

Recommended Dosage

  • Foliar – 3 L/ha
XGel activ Ruby logo





15-10-50+4SiO2+3MgO​+TE

Complex Highly Concentrated product of Functional Crop Nutrition®, in the form of a thixotropic Gel, rich in Potassium, with Bioavailable Silicon of E-PerForm® Technology and Magnesium.

  • Increase in bulb size and weight

Application timing:

  • Onion Bulb Development

Recommended Dosage

  • Foliar – 3 L/ha
Gravital Force SC logo





Gravital® Force SC is a Bioavailable elemental Silicium and Calcium Biostimulant in liquid form, with a high percentage of available orthosilicic acid [35% Calcium (CaO) & 35% Silicon (SiO2)].

  • Increase in bulb weight
  • Improvement of bulb firmness
  • Improvement of post-harvest shelf life of the bulbs

Application timing:

  • Onion Bulb Development

Recommended Dosage

  • Foliar – 2 L/ha
XGel activ Topaz logo





0-50-50+16SiO2+TE
Highly Concentrated Functional Crop Nutrition® product, in the form of a thixotropic Gel, with Bioavailable Silicon of E-PerForm® Technology, rich in Phosphorus and Potassium.

  • Increase in bulb size and weight

Application timing:

  • Onion Bulb Enlargement (Filling)

Recommended Dosage

  • Foliar – 4 L/ha

Success Stories Results

Measurements on both plots revealed impressive results in the Agrology treatment. Specifically, the results were as follows:

1. Bulb Weight Increase

Bulb Weight Increase: +33.7 g/bulb or 15.9%

  • Agrology: 246.2 g
  • Control: 212.5 g
Picture 2. Increase in Bulb Weight of 15.9% (+33.7 g) was achieved compared to the control.
Picture 2. Bulb Weight (g). With the application of Agrology Program, an increase in Bulb Weight of 15.9% (+33.7 g) was achieved compared to the control.
Picture 3. Average Bulb Weight – 13 onion bulbs (g).
Picture 3. Average Bulb Weight – 13 onion bulbs (g). With the application of Agrology Program, an increase of 439 g in the average tuber weight was achieved compared to Control.

2. Bulb Size Increase

A) Increase in Vertical Bulb Diameter (cm): +7.3% (+0.44 cm)
  • Agrology: 6.49 cm​
  • Control: 6.05 cm
Picture 4. Increase in Bulb Size (Vertical Diameter) of 7.3% (+0.44 cm) was achieved compared to the control.
Picture 4. Bulb Size (cm) – Vertical Diameter. With the application of Agrology Program, an increase in Bulb Size (Vertical Diameter) of 7.3% (+0.44 cm) was achieved compared to the control.

B) Increase in Horizontal Bulb Diameter (cm): +4.8% (+0.34 cm)
  • Agrology: 7.48 cm​
  • Control: 7.14 cm
Picture 5. Increase in Bulb Size (Horizontal Diameter) of 4.8% (+0.34 cm) was achieved compared to the control.
Picture 5. Bulb Size (cm) – Horizontal Diameter. With the application of Agrology Program, an increase in Bulb Size (Horizontal Diameter) of 4.8% (+0.34 cm) was achieved compared to the control.
Picture 6. Increase in Onion Bulb Size was achieved compared to the control.
Picture 6. Onion Bulb Size​. Agrology Program (right), Control (left). With the application of Agrology Program, an increase in Bulb Size was achieved compared to the control.
Picture 7. Onion Bulb Size​. Agrology Program (right), Control (left). With the application of Agrology Program, an increase in Bulb Size was achieved compared to the control.

3. Total Yield Increase

Total Yield Increase: +4.32 t/ha or 7.52%

  • Agrology: 61.7 t/ha
  • Control: 57.4 t/ha
Picture 8. Increase in Total Yield of 7.52% (+4.32 t/ha) was achieved compared to the control.
Picture 8. Total Yield (t/ha). With the application of Agrology Program, an increase in Total Yield of 7.52% (+4.32 t/ha) was achieved compared to the control.

4. Farmer’s Observations

    • Larger bulb size
    • Improved bulb filling

    Results Synopsis

    Picture 9. Results Synopsis in Onion cultivation
    Picture 9. Results Synopsis

    Farmer’s Financial Benefit

    Picture 10. Investment – Farmer’s Benefit (Average price: 0.35 €/Kg)

    Obtain detailed information on Agrology’s Functional Crop Nutrition® Programs by the specialized staff of Agrology.

    For further information, please contact us at: global@agrology.eu

    “This experiment was conducted under specific field conditions and should not be applied as a standard without the guidance of an Agronomist or the Agrology Technical Department. In any case, Agrology Functional Crop Nutrition® products and programs must be applied according to the label or the instructions of the technician-agronomists.”