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MultiCal MGB – Liquid Calcium, Nitrogen, and Magnesium Fertiliser

High-Analysis Liquid Blend for Fruit Development and Crop Quality
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MultiCal MGB – Liquid Calcium, Nitrogen, and Magnesium Fertiliser

High-Analysis Liquid Blend for Fruit Development and Crop Quality

A concentrated combination of Calcium, Nitrogen, Magnesium, and Boron designed to strengthen plant structure and improve fruit fill in a wide range of crops.


MultiCal MGB is a high-analysis liquid fertiliser containing 10 % Nitrogen, 17 % Calcium, and 3.8 % Magnesium, with added Boron and trace elements (Zinc, Iron, Manganese, Copper).
This formulation supports stronger cell wall development, better nutrient transport, and improved fruit quality during critical growth and fruit-fill stages.

Fully water-soluble and plant-available, it provides rapid uptake and visible results across fruit, vegetable, and orchard crops.
MultiCal MGB’s free-flowing formulation allows compatibility with a wide range of agricultural sprays, making it easy to integrate into existing nutrition programs.

Uses:

  • Foliar and soil nutrient correction for fruiting and vegetable crops
  • Improves fruit firmness, quality, and storage potential
  • Strengthens cell walls for better stress resistance
  • Prevents calcium and magnesium deficiencies in crops
  • Ideal for use in orchards, vines, and horticultural programs

Features
  • High analysis of Ca (17 %), N (10 %), and Mg (3.8 %)
  • Contains Boron, Iron, Zinc, Manganese, and Copper for balanced trace support
  • Fully soluble and readily absorbed by plant tissues
  • Enhances cell strength, structure, and fruit quality
  • Improves crop resilience under rapid growth conditions
  • Free-flowing formulation compatible with most ag-chemicals
  • Suitable for spray, fertigation, or aerial application
  • Manufactured by AgroBest Australia
  • Available in 20 L, 200 L, and 1000 L

Technical Specifications

Product Composition
 
Component % W/V (Australia) % W/W (International)
Nitrogen (as Nitrate + Urea) 10.0 (8.1 + 1.9) 6.7 (5.4 + 1.3)
Calcium (as Nitrate + Chloride) 17.0 (11.6 + 5.4) 11.3 (7.7 + 3.6)
Magnesium (as Chloride) 3.8 2.5
Zinc (as EDTA Complex) 0.02 0.013
Iron (as DTPA Complex) 0.02 0.013
Manganese (as EDTA Complex) 0.016 0.011
Copper (as EDTA Complex) 0.002 0.0007
Boron (as EDTA Complex) 0.2 0.13

Physical & Chemical Properties

 
Property Value
Colour Light Green
Specific Gravity (S.G.) 1.48 – 1.52
pH Range 2 – 3

Application & Packaging Information

 
Specification Value
Application Methods Foliar spray, fertigation, or aerial application
Sizes Available 20 L | 200 L | 1000 L
Country of Manufacture Australia (AgroBest Nutritional Systems)
Compliance Environmentally safe trace element fertiliser

Recommended Application Rates

 
Crop Type Rate / ha Dilution Application Timing
Avocados 5 L 1:100 Monthly from flowering to end of fruit development
Brassicas 6 L 1:50 Fortnightly before head formation
Cereals & Legumes 3 – 5 L 1:50 With crop sprays to assist growth and prevent deficiency
Citrus 4 – 8 L 1:100 Prior to bloom and petal fall; repeat as required
Cucurbits 2 – 5 L 1:75 Prior to flowering; repeat regularly
Field Crops 3 – 5 L 1:50 With compatible sprays – aerial use approved
Leafy Greens 3 L 1:100 Fortnightly before head formation
Olives & Nuts 3 – 5 L 1:100 From fruit set onwards monthly
Stone & Pome Fruit 5 L 1:150 Post-blossom weekly through season
Tropical Fruit 2 – 4 L 1:200 Before bloom; repeat as required
Turf 100 mL/100 m² 1:20 As required to correct deficiencies
Vegetables 4 – 6 L 1:100 Monthly tank mix applications
Grape Vines 2 – 4 L 1:100 Before flowering and during fruit set

Compatibility

Compatible with most fertilisers and agrichemicals.
Avoid combining with strong alkaline products.
Add AgroChelate (1:1000) first to tank to improve compatibility and nutrient efficiency.

Why Choose This Product

MultiCal MGB supplies balanced Calcium, Nitrogen, and Magnesium in a fully soluble form to optimise plant structure and fruit firmness.
It enhances quality, reduces physiological disorders, and promotes better storage life of produce.
Ideal for professional growers seeking precision nutrient management and improved fruit finish under high-performance cropping systems.

Frequently Asked Questions

MultiCal MGB provides a concentrated source of Calcium (17%) and Magnesium (3.8%), two nutrients critical to fruit structure and integrity. Calcium strengthens cell walls, making fruit tissue denser and less prone to cracking, bruising, or softening during storage and transport. Magnesium supports chlorophyll formation and photosynthetic efficiency, ensuring energy is available for sustained fruit growth and ripening.

When applied during fruit-fill and maturation stages, MultiCal MGB improves firmness, reduces physiological disorders (such as blossom-end rot, bitter pit, and soft fruit), and enhances shelf life. Boron and trace elements (Zinc, Manganese, Iron, Copper) further assist in calcium mobility within plant tissues, ensuring nutrients reach the fruit where they are most needed. The result is stronger, more uniform fruit with improved storage potential and market quality.
Yes — MultiCal MGB is formulated as a free-flowing, fully soluble liquid compatible with most fertilisers and agrichemicals. It can be used in foliar sprays, fertigation systems, and aerial applications. However, users should avoid mixing it with strong alkaline or phosphate-based products, which may cause precipitation or reduce nutrient availability.

For best tank-mixing results:
  • Begin filling the spray tank with water.
  • Add AgroChelate (1:1000) or another compatibility buffer if available.
  • Add MultiCal MGB while maintaining agitation.
  • Finally, add compatible crop protection products or foliar nutrients.

A quick jar test is recommended before large-scale mixing to confirm stability. Following these steps ensures uniform nutrient delivery and prevents clogging in drip or spray systems.
Calcium and Magnesium play complementary roles in plant cell structure, enzyme activation, and nutrient transport. Calcium acts as a structural component of cell walls, maintaining rigidity and reducing susceptibility to diseases and mechanical stress. Magnesium, on the other hand, forms the central atom in chlorophyll molecules, supporting photosynthesis and carbohydrate production — essential for strong growth and energy balance.

When supplied together through MultiCal MGB, these nutrients improve the plant’s ability to cope with rapid vegetative growth, heat stress, or salinity, while maintaining balanced nutrient uptake. This combination also promotes better pollination, fruit set, and uniform development, especially in crops with high calcium demand such as olives, citrus, and stone fruit. Regular use ensures improved yield consistency and visible improvement in fruit firmness and finish.

 
Features
  • High analysis of Ca (17 %), N (10 %), and Mg (3.8 %)
  • Contains Boron, Iron, Zinc, Manganese, and Copper for balanced trace support
  • Fully soluble and readily absorbed by plant tissues
  • Enhances cell strength, structure, and fruit quality
  • Improves crop resilience under rapid growth conditions
  • Free-flowing formulation compatible with most ag-chemicals
  • Suitable for spray, fertigation, or aerial application
  • Manufactured by AgroBest Australia
  • Available in 20 L, 200 L, and 1000 L
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File Title File Description Type Section
Multical_MGB_2022.pdf MultiCal MGB Trace Elements Fertiliser. Directions detailed on product label Catalogue Document

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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