VolcaMin (clinoptilolite Zeolite) - Horticulture & Agriculture Grade - 1-2mm (20KG)

In Stock

Buy In Bulk & Save!
Buy 6 to 50: Pay $29.95

Calculate Shipping


(clinoptilolite Zeolite)



VolcaMin Zeolite used in Australian Agriculture



Nutrient Efficiency System

for Horticulture



The Complete in Soil Nutrient Management Solution


VolcaMin works as a fertiliser battery, charging when free nutrients are available, holding them from leaching and releasing them to plant demand as required.  Volcamin is not effected by temperature and reduces the leaching of nutrients under hot tropical conditions, holding them for use by the plant instead.


Volcamin is also an excellent capillary distributor of water due its highly porous properties, assisting infiltration, holding water higher in the pot and distributing water and nutrients more evenly through the mix which is important especially under drip irrigation. It is used in several leading wetting agents.


Use of Volcamin will soak up excess ammonium and other cations in mixes often released under hot conditions, preventing root burning.  Volcamin is marginally alkaline and a source of available calcium so its use with fertilisers can help buffer pH levels thus reducing the need for lime applications.


Volcamin carries a negative ionic charge which naturally attracts positive charged cations like ammonium, potassium, magnesium and calcium. The open crystalline structure of Volcamin has many storage sites for these ions which hold naturally through a loose chemical bond. These fertiliser ions are available to plants. Volcamin has a very high cation exchange capacity and thus increases the mixes ability to hold and release nutrients. As cations are water soluble they escape from mixes by leaching.   Volcamin is the perfect planting partner as it is a natural wetting agent and distributor of water as well as an electrically charged fertiliser magnet.


It helps water penetrate sandy non-wettable soils and will evenly distribute water around drippers and soak lines. It should be used in planting holes, mixed with the top 10-15cm of soils or a mulch.

As a planting amendment, it makes a permanent difference as it won’t break down or be eaten by microbes in the soil. Volcamin has ten times the nutrient holding capacity per litre than peat and helps prevent environmental leaching of nutrients into waterways.


VolcaMin Nutrient Efficiency System for Agriculture & Plantations


The Complete in Soil Nutrient Management Solution  


Incorporating VolcaMin into your soil conditioning and fertiliser program is a long term investment in the productivity of your soils and return on your fertiliser investment. Mixed into holes at planting, banded or applied around existing plantations or mixed with fertiliser blends, VolcaMin will improve plant available nutrient uptake and conversion to yield. Volcamin dramatically improves poor soils and as it doesn’t break down and is not consumed by microbes it is a permanent amendment and conditioner.


  • Reduces leaching dramatically
  • Selective for ammonium potassium calcium & magnesium
  • Stores up to 2% of its own weight in molecular ammonium, potassium, calcium & magnesium
  • Improves nutrient availability
  • Volcamin improves water infiltration
  • Volcamin improves capillary distribution through the soil
  • Drains freely, won’t clog the soil
  • Solution to poor soils under tropical rainfall
  • Stores nutrients that are normally washed away
  • Reduces environmental impact on streams & rivers from reduced farm nutrient run off


   Malaysian Mangoes

  Malaysian Mangoes using Zeolite       Malaysian Mangoes using Zeolite 2

                     20th Aug 07                                                                                                                                         3 months later


Enables better growth through permanently improved water & nutrient retention


  • Mixed in from 1% to 5% of root zone soils
  • Applied with Fertilisers 
  • Natural wetting agent
  • Total Porosity 42.4%
  • Water holding by volume 26.6%
  • Capillary water holding without loss of drainage
  • Nutrient holding through high cation exchange
  • Permanent, isn’t consumed by microbes or plants
  • Selective for ammonium potassium calcium & magnesium
  • Reduces leaching dramatically




Healthy trees using Zeolite


With Volcamin Inclusion

Without Volcamin Inclusion


Soil and Fertiliser without Zeolite


  • Water and soluble fertilisers pass through the low cation exchange capacity soil profile with nothing to attract and hold them
  • Valuable nutrients are leached through
  • Plant available nutrition is poor
  • Particularly true of poor soils under tropical rainfall
  • Although drainage is good, water retention is poor
  • Runoff water becomes nutrient contaminated 


Soil and Fertiliser with Zeolite

  • Water and soluble fertilisers are attracted and held in the soil profile or growing media Valuable nutrients are not leached but exchanged onto the Volcamin
  • Plant available nutrition is much better as the plants can harvest the Volcamin
  • Hydraulic conductivity is not affected
  • Capillary distribution is much better
  • More water is held higher in the profile
  • Higher yields from better nutrition
  • Reduced Environmental leachate





Improved Nitrogen Uptake

VolcaMin particular affinity to attract and hold ammonium enables it to catch and hold nitrogen fertilisers from leaching through the soil for maximum plant available nutrition. Plants readily extract the stored nitrogen they require from the Volcamin by active root uptake.

University of New England; Department of Agronomy & Soil Science. Test of Lettuce and Reseda odorata into potting mixes at 8% by weight and Uralla (sandy granitic) soil


  • The results of the trials using Volcamin were significant. 
  • Volcamin addition produced considerable increases in plant growth
  • Volcamin reduces Nitrogen toxicity in early plant growth.          
  • Volcamin has the ability to retain nitrogen in the absorbed (NH4+) form against leaching

Potted plant trials with and without Zeolite


  • Volcamin improves the uptake of Nitrogen in plants and improves fertilizer utilization


  • Volcamin improved uptake by plants by 175% in Potting mix



Lettuce trials with and without Zeolite - University of New England 



Improved Nitrogen Recovery from plant tissue

Cornell University USA

  • Recovery of applied Nitrogen from grass in Volcamin amended sand profile
  • For the sand profiles, the percentage of applied fertilizer N that was recovered in grass clippings ranged from
  • 62% to 70% of the applied N
  • The addition of 10% Volcamin to the sand resulted in a greater amount of the fertilizer N ending up in the bent grass clippings
  • 75% to 93% of the applied N.
  • This difference was most noticeable at the lower N application rate.
  • Adding 10% Volcamin to sand also resulted in substantially less nitrate leaching.
  • Leaching of NO3 reduced by 88%
  • Leaching of NH4 reduced by 99% VolcaMin with VolcaMin

Improved Potassium Uptake


Potassium is a vital nutrient for flower and bud initiation and is one the most expensive nutritional element. VolcaMin particular affinity for potassium enables it to be stored in the soil for efficient plant use. Potassium is often critical to yield.


Trial work confirms VolcaMin impact on potassium availability and uptake.


Trial in a Commercial Trellis Tomato Crop, Institute of Sustainable Irrigated Agriculture Tatura Victoria 2003


The effect of Volcamin banded pre-planting at a rate of 1.4t/ha on a crop of indeterminate tomato (cv Red Ruby)


Shepparton Fine Sandy Loam soils was investigated in the Goulburn Valley

Trellis Tomato Crop with Zeolite - Institute of Sustainable Irrigated Agriculture Tatura Victoria

  • A significant increase in medium and large fruit grade fruit was observed in the Volcamin treatment.
  • The improved yield may be related to nutrient uptake that was significantly altered when compared with an untreated control
  • High potassium levels in petiole sap
  • Lead to more flower, bud initiation & fruit
  • Potassium is a key driver of flowering and yield


Improved Trace Element Nutrient Uptake

University of Colorado Soil Science Dept trials, Sorghum Sudan grass with VolcaMin

  • Increased production by a 65%
  • Increased P uptake
  • NH4 – Volcamin can Mobilise nutrients & trace elements
  • Lead to higher trace nutrient concentrations in tissue
  • Concentrations of nutrient elements in plant matter increased by:
  • P 100%,
  • Cu 100%,
  • Mn 450%,
  • Ca 50%,
  • Mg 30%
  • Zn 30%

Sorghum Sudan grass with VolcaMin Zeolite



Naturally extracts Phosphorus


VolcaMin can naturally assist in releasing phosphorus from soil lock ups or mineral apatite’s. Plants extract the stored ammonium and potassium from the Volcamin by active root uptake, exuding hydrogen ions to replace the nutrient on the Volcamin structure. This loosely bonded hydrogen then exchanges back into the soil as the Volcamin more strongly attracts calcium ions, even breaking the bond of phosphorus and calcium to pull the calcium onto the Volcamin, releasing the phosphorus to plants.


  • Formula US Geological Survey Research
  • Phosphate rock + NH4-Volcamin < = > Ca-Volcamin + NH4 + H2PO4
  • Naturally extracts phosphorus from applied P locked up in the soil
  • Extracts calcium from phosphates
  • Releasing Phosphorus for the Plant
  • Partners to fertilisers MAP DAP Urea & Potassium’s
  • Buffers and holds ammonium & Urea


Improved Fertiliser Conversion

A trial effect of Volcamin on Clipper malting barley, was carried out by Australian Agricultural Technology at Barooga, NSW


  • Incorporation of the VolcaMin increased the barley yield
  • With DS by 16% and with DAP by 18%.
  • The DAP plus VolcaMin yield was 34% greater than the DS alone yield.
  • Volcamin with DAP increased the seeds per head, filler number, yield and protein content of the Barley.


Volcamin Zeolite on Clipper malting barley trial - Australian Agricultural Technology Barooga NSW

Volcamin Zeolite on Clipper malting barley trial - Australian Agricultural Technology Barooga NSW - results


Improves Soil Structure

Volcamin improves soil structure with its massive internal surface area and porosity. This surface area creates considerable surface tension with available water exerting a great capillary pull. This equates to a natural wetting agent effect with greater infiltration of water into soils and more even capillary distribution throughout the soil. This assists in holding more water higher in the soil profile and spreading available water more evenly from irrigation points. As the Volcamin is mildly alkaline, it has a liming effect on acid soils.


  • Improves water infiltration and even capillary distribution through soil profile
  • Helps hold more water higher in the root zone
  • Drains freely, won’t block or clog soil
  • Encourages & provides a home to microbial life, improving micro flora populations
  • Increases cation exchange capacity
  • Has mild liming effect buffering acidity
  • Improves soil aeration
  • Treatment is permanent as the mineral does not physically break down
  • Can be built up in the soil over time when applied with fertilisers
  • Perfect treatment for tropical applications with poor soils and high rainfall

Improved Soil Structure using VolcaMin Zeolite

Rates & Inclusion

Growing Mixes

  • 2.5% of mix volume = 25Kg per M³
  • 5% of mix volume = 50 Kg per M³
  • 10% of mix volume = 100 Kg per M³


Field Application

  • The efficiency of NPK fertilisers can be increased by the inclusion of Premium Horticultural Grade VolcaMin at 25%-50% of blend
  • Soil Amendment 1-5 tonnes tonnes/Hectare


 Tree Rates Tropics

  • At Planting 5-10 Kgs per planting hole
  • Circle Trenching 3-5 Kgs per tree


Volcamin will also remove ammonia odour from organic manures and improve the fertiliser value of Volcamin treated manures.


Echuca Tomato Trial

Property of Mick Cox

The trial was arranged through PIVOT representative Russell Nichol to evaluate the effect of addition of VolcaMin at the rate of 125 Kg/HA in addition to normal fertilizer program on processing tomatoes. The VolcaMin was added with Pivot 16 fertilizer at final stage of bed preparation prior to direct seeding.

Approximately 1 HA was treated (3 rows). No obvious growth response was noted and crop was mechanically harvested on 17th March 1992. Two control rows were harvested adjacent to treatment rows, the third being harvested further up the paddock where they had been operating before we harvested the trial.


Row                  Number of Bins per Row

                        Treatment         Control

1                      14.5                  13.0

2                      13.0                  12.5

3                      13.5                  12.0

TOTAL  41.0                  37.5

Echuca Tomato Trial using VolcaMin Zeolite

  • VolcaMin APPLIED @ 125 Kg/HA COST @ $300fT = $37.50/HA
  • 7.5 T /HA @ $109.00fT = $817.50                                                   (Noel Whitcher 25th March 1992)

Bundaberg Tomato Trial


The plants were grown in raised rows 9” wide with 27” spaces between rows. VolcaMin was applied within the rows at a rate of .5 tonne and 1 tonne equivalent per acre. The VolcaMin was incorporated with the fertiliser directly into the rows at the time of planting and watering was by trickle irrigation. The actual application rates for the trial where the rows only form ¼ of the total area, was 0.125 and 0.25 tonne per acre respectively.


A known length of row (75 feet) was picked by hand in the treated rows and in the adjoining untreated row and yields recorded.


First picking

VolcaMin at 1 tonne to the acre (equivalent) = 60 kgs

Untreated adjoining row                                             = 50 kgs

Increase                                                                     = 20%

VolcaMin at .5 tonne to the acre (equivalent)            = 45 kgs

Untreated adjoining row                                             = 40 kgs

Increase                                                                     = 12.5%

Bundaberg Tomato crop using VolcaMin Zeolite

Total Harvest Results The one tonne per acre (equivalent) VolcaMin row yielded overall a 10% increase in fruit size with an accompanying 10-12% increase in yield weights.


Average yields on tomato production in Bundaberg are 1500-2000 cases per acre. The 10% increase in yield produced an additional 150 cases of tomatoes per acre valued at $1500.

Institute of Sustainable Irrigated Agriculture


Trial in a Commercial Trellis Tomato Crop, Tatura Victoria 2003


  • The effect of Volcamin banded pre-planting at a rate of 1.4t/ha on a crop of indeterminate tomato (cv Red Ruby) grown on Shepparton Fine Sandy Loam was investigated at Murchison East in the Goulburn Valley between January and May 2003.
  • A significant increase in medium and large fruit grade fruit was observed in the Volcamin treatment.
  • The improved yield may be related to nutrient uptake that was significantly altered when compared with an untreated control
  • High potassium levels in petiole sap
  • Lead to more flower, bud initiation & fruit
  • Potassium is a key driver of flowering and yield


Potassium is a vital nutrient for flower and bud initiation and is one the most expensive nutritional element. VolcaMin particular affinity for potassium enables it to be stored in the soil for efficient plant use. Potassium is often critical to yield.


Crop performance & yield

The Volcamin treatment had a significantly higher number (P=O.007) and yield (P=O.003) of medium-grade fruit, as well as a significant increase in Iarge fruit yield (P=O.042). Total fruit number was significantly (P=O.071) higher in the Volcamin treatment, although there was no significant total yield increase.


Effect of Volcamin on small, medium, large and total fruit yield and number in indeterminate tomato cv. Red Ruby

Fruit category







Number   Yield

Number   Yield

Number    Yield

Number     Yield


(/m)      (t/ha)

(/m)      (t/ha)

(/m)      (t/ha)

(/m)      (t/ha)


136.7    59.4

76.5      67.4

2.4        2.8

215.5    129.7


116.4    57.8

58.1      48.9

0.9        0.8

175.4    107.7

                                                                        Fruit size                                      


Proportion in category (%)

Average fruit





size (g)











Department of Agriculture (Victoria) Frankston Vegetable Research Institute
Minimum Tillage Vegies

Trials undertaken by the Department of Agriculture (Victoria) at the Frankston Vegetable Research Institute, showed that composts treated with Volcamin were more effective than untreated compost

Undertaken on light sandy soils, the trials compared traditional cultivation practices (lime base organic matter and chemical fertiliser) with a range of treatments involving organic matter.

The organic treatments were:

  • Fresh organic matter
  • Composted organic matter which had been turned during composting
  • Composted material which had been covered with Volcamin and not turned.


The experiments were run over eight crops during the two-year period with data being obtained on seedling emergence, crop yields, % of crop in marketable range and plant and soil chemistry.

Under traditional grower practice, the vegetable beds were prepared by cultivation and limed to achieve a pH of 65 they also had a base dressing of 10t/ha of fowl manure and chemical fertiliser @ 900-1100 kg/ha applied prior to each crop based on their requirement.

While the trial was not set up to specifically examine the role of Volcamin, it provided some interesting results:

  • Organic matter improved the soil’s physical condition.
  • In the first year the addition of mature compost with or without Volcamin or fresh organic matter resulted in significant yield increases compared to normal grower practice.
  • Soil analysis showed higher levels of nitrogen and potassium due to the ability of Volcamin to hold these nutrients in light sandy soils.
  • Tissue analysis showed similar nutrient levels in the plants in all treatments.
  • Overall, Volcamin had a role to play in improving com posted organic matter and in retaining nutrients (N & K) in light sandy soils



It is believed that where fresh organic matter alone is used, and the first crop is seeded, it can suffer from a release of phytotoxins composting eliminated these phytotoxins.


Department of Agriculture (Victoria) Frankston Vegetable Research Institute using VolcaMin Zeolite

The addition of Volcamin probably improved the value of the mature compost due to its ability to retain ammonium nitrogen and possibly the increase in efficiency of the nutrient supply to the crop.



Vegetable growing with Volcamin

Volcamin used in Compost, Jim Gatt with Digby Lobb, ACE Ohlsson


Jim Gatt has been growing vegetables for 20 years, and while there is not a lot he doesn’t know about the subject - Jim is always keen to look at new techniques and methods of improving his crops.

After hearing about natural Australian Volcamin from horticultural produce and Volcamin distributor, ACE Ohlsson, Jim decided to trial Volcamin on his Chinese cabbage and carrot crops.

Situated at Mangrove Mountain in New South Wales, the soil on Jim’s property is a free draining, light textured sandy loam.

Jim treated four rows of Chinese cabbage at the rate of one tonne Volcamin to one acre - with amazing results.

”I always harvest my crop at one time. But this time the Chinese cabbage in the Volcamin treated rows, HAD to be picked at least two weeks earlier than the rest of the crop!

”They could not possibly have been left or else they would have split open,” Jim said.

He added that the Volcamin treated cabbages were also the deepest green colour he had ever seen in all the time he has been growing the crop.

Jim harvested the balance of the crop about two weeks later, and even though an extra, light dressing of urea had been added to this remaining crop, the colour of the Chinese cabbage was definitely not as good as the Volcamin treated cabbage. Jim is now treating all his property with Volcamin, and is convinced it makes a difference to crop quality.

”It is obvious that by using Volcamin in this type of soil, nutrients are ’locked in’ and the plant takes what it wants, when it wants it. The Volcamin also helps reduce leaching which often happens on sandy soils.

”As well as the cabbage, I am certain that my new carrot crop has got a better start, and established more quickly because the soil has been treated with Volcamin:’ Jim said.


Sydney Grower Success

Joe Galea, with his sons Paul and Jason, grows vegetables at the family’s Mangrove Mountain (NSW) farm.  Last year they decided to trial 2 tonnes of Volcamin on capsicums and cabbages. Most of the farm’s soils are light and sandy and subject to leaching of fertiliser. They applied the Volcamin on loamy soil and a rate of 1 tonne per hectare (400 kg/acre)

”We have started harvesting and have noticed a more even size in the capsicums”

”The crop has certainly had a nice green colour and they have grown well,” said Joe, “we have started harvesting and have noticed a more even size in the capsicums.”

Sydney vegetable grower success using VolcaMin Zeolite

”It has been the driest summer in 30 years and, because of this, I don’t believe we saw the real benefits of Volcamin,” Paul & Jason agreed that the Volcamin had given a positive result but would provide even greater benefits under more normal rainfall conditions, ”We are about to prepare for our winter plantings and will use Volcamin prior to planting cabbages, we also intend to try some on carrots as other growers have found it very successful,” they said.



VolcaMin Sizes Available

(Certified Organic)


<1.0mm (Powder)

Standard Stock Feed Grade

1- 2mm

Horticultural (Greens) Grade

2.0 - 4.0mm

Agricultural & Horticultural Grade


Product Properties

























Bulk density




Slurry pH

8.65 (10% aq. suspension)



Surface area


Pore size

7 Angstroms


Off white



Boosts Other Products

By: on 20 January 2020
I applied this to my lawn prior to laying the turf and have seen the turf take very quickly. It seems to work well with the other Plant Doctor products, absorbing water & nutrients and slowly releasing them again when plants need them.


By: on 23 October 2019
Easy to use - just throw it down and forget about it. It's also cheap as chips which makes it even better

Perfect for the garden

By: on 19 October 2018
Brought it in Jan, has improved my garden beds with helping releasing water and reducing watering my plants to twice a week with the lawn, also been very beneficial for the lawn during reno

Write a product review

Others Also Bought

More From This Category