Organica Cal-Si-K – Calcium, Potassium & Silica Foliar Fertiliser

Chelated calcium, silica and potassium blend
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Organica Cal-Si-K – Calcium, Potassium & Silica Foliar Fertiliser

Chelated calcium, silica and potassium blend for fruit density and post-harvest quality.

Organica Cal-Si-K is a concentrated foliar and fertigation fertiliser combining calcium (6.2%), potassium (12%), and silica, complexed with amino acids for rapid plant uptake and nutrient efficiency.
This formulation improves fruit density, firmness and shelf-life while supporting stronger cell walls and post-harvest quality.

The low-salt, nitrate-free blend ensures compatibility with most crop programs and is particularly effective during fruit-fill and ripening stages when potassium and calcium demands are high.
Cal-Si-K is ideal for horticultural, orchard and broadacre systems requiring consistent quality, resilience and higher marketable yield.

Uses – For Fruit Quality, Density, and Shelf-Life Enhancement

Cal-Si-K is designed for fruit and vegetable crops, fruit trees and vines, pastures, turf, and broadacre crops.
It improves fruit set, finishing, and sweetness while strengthening plant tissue.
Applied as a foliar spray or fertigation supplement, it enhances nutrient translocation and stress recovery, reduces soft fruit disorders, and supports longer storage stability.

Technical Specifications
Nutrient / Parameter Typical Analysis (W/V)
Nitrogen (as conc. amino) 2.0%
Potassium (organic) 12.0%
Calcium 6.2%
Silica 0.2%
Rare Earth Minerals 0.05%
Fulvates (organic) 0.65%
Alginates 0.7%
Sugars (micro-feed) 2.0%
Filtration Filtered to 50 microns
Country of Manufacture Australia

Compatibility

Cal-Si-K is compatible with most neutral-pH liquid fertilisers and trace element solutions.
Avoid mixing with strong acids, phosphates, or sulphate-based products.
For foliar use, maintain pH between 6.0 and 7.0. Store in a cool, dry area away from direct sunlight to preserve biological activity.

Why Choose This Product

Organica Cal-Si-K provides a reliable foliar and fertigation solution for improving crop finish and post-harvest performance.
The combination of calcium, potassium and silica strengthens fruit structure, enhances nutrient transport, and boosts resilience to stress and handling.
It offers a simple, low-salt formulation that delivers rapid, visible results in both fruit quality and storage life.

Frequently Asked Questions

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Organica Cal-Si-K is a balanced liquid formulation combining calcium (6.2%), potassium (12%), silica, and amino acids in a readily available form. It is designed to improve fruit density, sweetness, firmness, and post-harvest shelf life. The product enhances the final stages of fruit maturation by strengthening cell walls and improving sugar accumulation. The inclusion of silica and amino acids promotes stress tolerance and nutrient transport, helping plants recover quickly after stress events such as heat or drought.
Cal-Si-K supplies a fast-absorbing blend of calcium and potassium that strengthens fruit skin and internal tissue structure. Calcium enhances cell wall integrity, reducing bruising and post-harvest breakdown, while potassium increases sugar translocation and improves colour uniformity and flavour. The presence of silica creates a protective layer in plant tissues that enhances firmness and resistance to environmental stress. Together, these nutrients extend the storage and transport life of harvested fruit while maintaining quality and appearance.
Nutrient Typical Analysis (W/V)
Potassium (organic) 12.0%
Calcium 6.2%
Nitrogen (as amino) 2.0%
Silica 0.2%
Fulvates (organic) 0.65%
Alginates 0.7%
Rare Earth Minerals 0.05%
Sugars (micro-feed) 2.0%

​The chelated and complexed nature of this nutrient mix ensures rapid assimilation through both leaf and root surfaces, delivering fast results in fruit quality improvement.
For fertigation, dilute Cal-Si-K at a ratio of 1:200, applying between 5–10 L per hectare depending on crop load and growth stage. For foliar spraying, mix 500 mL to 1 L per 100 L of water and apply evenly to leaf and fruit surfaces until runoff. It is best applied during fruit-fill, ripening, or pre-harvest stages when potassium and calcium demand are highest. Applications are most effective in the early morning or late afternoon to avoid evaporation and enhance nutrient uptake.
Unlike standard potassium or calcium fertilisers, Cal-Si-K combines these key elements in a biologically complexed form with silica and amino acids for enhanced uptake. The product’s balanced ratio allows simultaneous absorption of both nutrients without interference. The addition of silica improves the mechanical strength of cell walls, while the amino acids act as natural chelators, improving nutrient transport efficiency within plant tissues. This ensures faster visible improvements in fruit firmness, sweetness, and storage stability.

 
Key Features
  • 6.2% calcium and 12% potassium for balanced fruit development
  • Silica and aminos enhance nutrient absorption and cell strength
  • Ideal for fruit-fill, finishing, and quality improvement stages
  • Chelated and complexed for efficient foliar uptake
  • Free from nitrates and sulphates with a very low salt index
  • Increases fruit density, sweetness, and post-harvest firmness
  • Improves plant recovery after stress and enhances shelf-life
  • Suitable for fertigation and foliar use across all crop systems
  • Contains trace levels of rare earth minerals and fulvates
  • Manufactured in Australia and certified for organic systems
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4 Factors In Grove Management To Focus On For Next Olive Harvest

The Grove Management Plan: Essential Areas to Focus On

A successful Grove Management Plan must cover these key areas:

  • Irrigation
  • Nutrition
  • Pruning 
  • Pest and Disease Control

Irrigation

"A grove without an effective irrigation system is unlikely to deliver consistent yields year after year. Many growers still underestimate the water needs of olive trees, and few actually monitor soil moisture levels. This is why so many groves have never achieved a commercial crop."  Marcelo Berlanda Specialist Olive Consultant

Water stress negatively affects flowering, fruit set, oil accumulation (oil production), fruit size (table olives), fruit quality, and overall tree health. However, many growers lack a proper system to monitor soil moisture or manage irrigation effectively. 

Marcelo recommends:

"Growers should inspect soil moisture weekly during spring and summer, and every two weeks in autumn and winter. Use a shovel to dig at least 400mm under the tree canopy to check moisture. If the soil is hard to dig, it’s too dry – even if the canopy shows no visible signs of stress." 

Advanced soil moisture monitoring tools can also provide reliable data on a digital display or computer dashboard. 

For optimal grove health, growers must consistently check soil moisture and prevent water stress.

Nutrition

As discussed previously, taking leaf samples is essential to assess your trees’ nutritional status. This information guides the creation of a fertiliser program, a critical component for boosting or maintaining yields.

Typically, no fertiliser is needed in winter, unless you’re addressing soil amendments. However, some groves have severe nutrient deficiencies requiring fertiliser even in winter. Where proper irrigation systems aren’t in place, growers must broadcast fertiliser before rain to allow rainfall to incorporate nutrients into the soil profile, an inefficient use of resources but often the only option.

When applying fertiliser in these conditions, target the area beneath the canopy and, if possible, cultivate the soil to improve incorporation and reduce product loss.

Olives need four essential nutrients: Nitrogen, Phosphorus, Potassium, and Calcium. Check product labels carefully. As a general guideline, aim for:

  • Nitrogen 15%
  • Phosphorus 5% or less
  • Potassium 10% or less
  • Calcium 2% or less

Pruning

Avoid pruning during the coldest part of winter and when it’s wet or foggy to reduce the risk of bacterial and fungal disease spread.

The main goals of pruning are to remove dead wood, reduce canopy size, restore tree balance, encourage healthy new growth, and increase fruit set in spring.

Tip: After pruning, apply a copper-based spray to protect wounds from infection by fungi and bacteria.

Pest and Disease Control

Pest and disease management is crucial for sustaining yield and tree health. Winter’s colder temperatures reduce insect activity, offering a prime time to tackle pest issues.

Set up a comprehensive Pest and Disease Monitoring Program. During winter, check marked trees (previously affected by pests or diseases) every two weeks; in spring, check weekly. Look under leaves and on new growth for signs like crawlers, yellow spots, black sooty mold, or anything unusual.

Proactive, weekly management is essential for a successful grove.

If you need further assistance, please contact us.


Global Shortage of MAP (Monoammonium Phosphate) & DAP (Diammonium Phosphate)

INDUSTRY UPDATE

URGENT FERTILISER SUPPLY UPDATE - MAP & DAP SHORTAGE

Global Shortage of MAP (Monoammonium Phosphate) & DAP (Diammonium Phosphate)

This summer cropping season is facing unprecedented challenges in fertiliser supply. Availability of MAP fertiliser (monoammonium phosphate) and DAP fertiliser (diammonium phosphate) is expected to remain extremely limited worldwide, with serious implications for growers planning their nutrient programs.

Why is Fertiliser Supply Tight?

China’s Export Restrictions Continue

Since 2021, China has imposed strict quotas and inspection rules on phosphate fertiliser exports to protect domestic prices and safeguard food security. The impact has been dramatic:

  • March 2025 exports: just 13,000 tonnes, compared with 950,000 tonnes in March 2022.
  • Q1 2025 exports: 111,000 tonnes, versus a three-year average of 785,000 tonnes.

China’s internal demand continues to climb due to increased grain production and the rapid growth of the electric vehicle industry, especially in battery manufacturing. Analysts predict that restrictions will remain in place-or even tighten-throughout 2025.

Other Suppliers Cannot Fill the Gap

Although Morocco, Russia, the USA, and Saudi Arabia also produce MAP and DAP, they cannot offset the sharp drop in Chinese exports. The result is:

  • Rising global fertiliser prices
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Global Shortage of MAP (Monoammonium Phosphate) & DAP (Diammonium Phosphate)

URGENT FERTILISER SUPPLY UPDATE – MAP & DAP SHORTAGE

Global Shortage of MAP (Monoammonium Phosphate) & DAP (Diammonium Phosphate)

This summer cropping season is facing unprecedented challenges in fertiliser supply. Availability of MAP fertiliser (monoammonium phosphate) and DAP fertiliser (diammonium phosphate) is expected to remain extremely limited worldwide, with serious implications for growers planning their nutrient programs.

Why is Fertiliser Supply Tight

China’s Export Restrictions Continue

Since 2021, China has imposed strict quotas and inspection rules on phosphate fertiliser exports to protect domestic prices and safeguard food security. 

The impact has been dramatic:

  • March 2025 exports: just 13,000 tonnes, compared with 950,000 tonnes in March 2022.
  • Q1 2025 exports: 111,000 tonnes, versus a three-year average of 785,000 tonnes.
China’s internal demand continues to climb due to increased grain production and the rapid growth of the electric vehicle industry, especially in battery manufacturing. Analysts predict that restrictions will remain in place... or even tighten... throughout 2025.

Other Suppliers Cannot Fill the Gap

Although Morocco, Russia, the USA, and Saudi Arabia also produce MAP and DAP, they cannot offset the sharp drop in Chinese exports. 

The result is:

  • Rising global fertiliser prices
  • Longer delivery lead times
  • Stricter supplier allocations
  • Reduced pricing flexibility across the summer cropping season

What This Means for Growers

For olive growers and other professional producers, the impacts are already being felt:

  • Reduced fertiliser availability for summer cropping
  • Higher input costs with delivery delays
  • Less flexibility in nutrient timing and program planning

Looking forward, risks include:
  • Reduced or cancelled fertiliser allocations
  • Possible product unavailability at short notice
  • Last-minute program changes forced by supply shortages

Our Recommendations - Secure Your Supply Now

Do not wait for traditional ordering windows. Place orders immediately and consider forward contracting for next season. Securing current pricing now helps protect your operation against higher costs and potential shortages later.

Optimise Your Nutrient Strategy

  • Review alternative phosphate fertiliser options
  • Adjust application rates where agronomically feasible
  • Consider split applications to maximise nutrient efficiency
  • Explore precision application technologies to reduce overall fertiliser requirements

Understanding Olive Leaf Tip Dieback: Causes, Diagnosis, and Management

Discover how to diagnose and manage olive leaf tip dieback, a common issue caused by nutrient deficiencies, salinity, or environmental stress. Learn expert strategies for restoring tree health through balanced nutrition, soil and water management, and effective disease prevention — backed by The Olive Centre’s professional resources and products.
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