Microbe Plus® Citrus is a foliar fertiliser that has been specifically designed for application to citrus trees — but can be equally effective for a range of horticultural crops.

In the citrus industry foliar fertiliser can improve yields through direct application of nutrients to where they will deliver the fastest response. The efficiency of foliar application can be greatly improved by integrating with microbial cultures, and microbial metabolites.

Microbial metabolites are important constituents of Microbe Plus Citrus. They are major building blocks of plant cells and bio-stimulants which have positive effects on growth, yield and quality, while mitigating potential damage from exogenous stress factors such as heat, frost, salinity and chemicals.

Potassium (K) is one of the most important nutrients in citrus crops. It is needed for enzyme activation, photosynthesis and transportation of photosynthates, and many more physiological functions. 

In the commercial citrus industry, soil K uptake has limitations typically due to cation imbalances in the soil. Foliar K absorption is far more efficient, helping to deliver better yields.

Calcium is a constituent of the cell walls in the form of calcium pectate. Calcium root uptake is often hindered by poor cation exchange and poor calcium:magnesium ratios in the soil—ratios that are important to overall soil structure.

Foliar application of calcium is a widely accepted practice. Microbe Plus Citrus contains calcium in organic acid chelated form, which has more effective penetration through the leaf surface allowing calcium to be more readily available to the tree.

Benefits of Microbe Plus Citrus in foliar appllication

  • Microbe Plus Citrus delivers a complete blend of macro and micro nutrients
  • Absorption of nutrients is enhanced by improved penetration of ions through the leaf cuticle layer via organic acid chelation
  • Improves resistance of the plant to various stress factors
  • Improves fruit quality, fruit size, colour and shape
  • Rapidly corrects macro and micro nutrient deficiencies.

Shelf Life

  • 12 months from the manufacturing date
  • Microbe Plus Citrus should be stored at ambient temperature
  • Preferably store away from direct sunlight, but within a well lit area so that the microbial digestion process continues.

Compatibility and Use

Microbe Plus Citrus can be mixed and applied with most commonly used pesticides, however, Microbe Plus Citrus should not be used with selected herbicides.
We strongly recommend checking labels for compatibility as well as testing a small area prior to widespread application.

Optimising results

Use with Grow Green’s Xtend® plant oil adjuvant for optimum results. Xtend will maximise the result by reducing drift and increasing adherence to the sprayed surface.

Typical analysis

Nutrient Form Analysis (W/V)
Nitrogen (N) as nitrate 7.00%
Phosphorus (P) as water soluble 0.10%
Potassium (K) as nitrate 3.75%
  as phosphate 0.10%
  as molasses 0.15%
  Total 4.00%
Calcium (Ca) as nitrate 4.60%
Magnesium (Mg) as nitrate 1.10%
Zinc (Zn) as nitrate 1.80%
Manganese (Mn) as nitrate 0.60%
Iron (Fe) as sulphate 0.02%
Boron (B) as sodium borate 0.042%
Molybdenum (Mo) as sodium molybdate 0.015%
Cobalt (Co) as sulphate 0.007%


Microbe Plus Citrus is suitable for use in horticultural crops as a foliar application during the critical growing period. Crops include citrus, almond, walnut, grapes, apple, tomato, potato, mango, banana, kiwi fruit, and many vegetables.

Crop Rate/ha* Number of applications
Horticultural crops 4 to 5L 3-4 foliar applications, post flowering and fruit enlargement stage
Broadacre Winter crops 2-3L 2 foliar applications (mid tillering and booting - grain filling stage)
Broadacre Summer crops 4-5L 2-3 foliar applications; pre flowering, post flowering and grain filling stage
Annual and perennial pasture 3-4L 3-4 foliar applications post grazing

*To be diluted in a minimum of 100L of water per hectare. We recommend foliar spray to point of run off. 

For information about specific application rates, contact our technical staff:
phone +61 7 5463 9900 OR 1800 355 913
email: This email address is being protected from spambots. You need JavaScript enabled to view it.

FileFile sizeDownloads
Download this file (Microbe Plus Citrus Brochure_0716.pdf)Microbe Plus Citrus brochure538 kB397
Download this file (Microbe plus Citrus SDS.pdf)Microbe plus Citrus SDS.pdf227 kB416

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For more information about us or our products:
phone +61 7 5463 9900
Free call 1800 355 913

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6089 Cunningham Highway
Kalbar, Queensland 4309  Australia

Contact an Australian distributor

We have distributors in:
New South Wales
South Australia

Contact our head office for your nearest distributor
phone +61 7 5463 9900
Free call 1800 355 913
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