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Welcome to the new Fargro website: retail and trade, now in one place.

Retail Customers call 01903 258200 • Trade Customers call 01903 726100.

Professional horticultural supplies for home and trade.

Trade and retail welcome. Expert advice and UK-wide delivery

Trusted by gardeners and growers for over 80 years

FAQ's

1. Product
What is CALLOS and what does it do?

CALLOS is a foliar calcium fertiliser that uses Flex Technology to deliver calcium, boron, and amide nitrogen in a highly efficient amide complex - reducing the risk of calcium deficiency disorders and improving fruit quality.

What is Flex Technology and why does it matter?

Flex Technology binds nutrients to amide nitrogen and carbon in stable, neutrally charged complexes that are actively taken up by the leaf - a significantly more efficient delivery system
than conventional salt-based foliar fertilisers.

What does CALLOS contain?

CALLOS contains amide nitrogen (3.9% w/v), calcium as CaO (14.6% w/v), boron (0.26% w/v), and added amino acids - all delivered via Flex Technology.

2. Application
Which crops is CALLOS recommended for?

CALLOS is recommended for soft fruit, top fruit, and vines, with application timings adjusted by crop type to target key calcium demand windows.

How does CALLOS fit into an INM programme?

CALLOS slots directly into existing Integrated Nutrient Management programmes as a targeted calcium correction tool, without requiring changes to the wider programme structure.

3. Performance
What disorders can CALLOS help prevent?

CALLOS targets the calcium deficiency disorders that damage packout quality and profitability - including tip burn, blossom end rot, and bitter pit.

Is there trial data available for CALLOS?

Yes - 2024 vineyard trial data from an Essex trial site showed CALLOS at 2 L/ha increased leaf calcium content by 9.9% against an untreated control.

4. Sourcing
Why source CALLOS through Fargro?

Fargro is the exclusive UK importer for Aiva Fertilisers, giving you direct access to technical support from both Fargro's agronomy team and Aiva's specialist contacts - not just
product supply.

Specifications

Analysis 3-0-0+11.2%CaO+0.2%B (3.9-0-0+14.5 CaO+0.25%B w/v)
Control Calcium deficiency.
Crop Soft fruit, top fruit and vines.
Stocking Units Bottle
Stocking Status Stocked