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These soils produce healthy plants with a strong immune system. Soils below 10 -6 gauss are not produce, regardless of organic matter content. These soils produce weak plants that are subject to insect and microbe attacks. Weak plants in turn create weak animals and humans. If he has done extensive research on rock dust, then post a link to a study that shows it work in the field.

This is a really poorly written article for someone who says their a gardener. My proof is in my growing. Too much phosphate becomes toxic to plants. Sorry but this is ridiculous, you are writing a post on something you have done no trials on yourself with huge amounts of speculation. Do some controlled trials and post your results and then write a post. It might not be for everyone but at least speak from an informed place instead of this sensationalism gardening crap.

Since you are so sure it works — provide a link to some a scientific study that shows nutrients increase after adding rock dust. YES there are many different types of soil and they vary in their composition. Hence the need for mineral balancing. Kinda surprised that someone so smart can miss the obvious.

Calcium Fertilizers

Yes soils all have different mineral balance but the ratios they work with have been found to be the optimum and bring the soil to an ideal for optimum growth. Certainly I think there is much more need for citizen science. And actual good science…. SO that partially states the obvious. Plus you disclude that Callihans work was confiscated. So you know that evidence thing. I think people who have previously tested their soils might use a general amendment to keep balancing without testing.

So without reviewing their tests and data in the field you cannot truly say no evidence. You can say anecdotal evidence. Why would compost need to include manure to contain all minerals plants need? Does plant material need to be processed by digestive tract to free up the minerals and put them in a form plants can take up?

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Compost does not need manure. Any plant material will be decomposed by microbes, and in the process they will release all of the minerals. Excellent article, Robert! He sent crop samples to a lab for analysis and found no difference in nutrient density in crops grown in soil amended with rock dust. But how fast is the process? My limestone contains both Mg and Ca and it has been reacting with CO2 for millions of years — there is still lots here. If this weathering was working we would be seeing rocks disappear and we would have no CO2 problem. Limestone is already a carbonate, how can it react with CO2?

You mean it is undergoing wheathering by dissolving in mildly acidic rainwater? Most likely, for the majority of gardens, this is unecessary, but as you often say, it depends on the soil, which only tests can tell. A quick look at the reference does not provide numbers for this. In the last link, it points out to a few studies where yield and disease resistance where increase by silicates applications, and includes a rate of removal:. Larger removal rates are estimated from high—Si-accumulator crops such as wheat, sugarcane, and rice. I did a little searching about green sand.

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It is a common recommendation by organic growers. As far as I can tell it decomposes very slowly, on the order of rock phosphate. I wondered if using rock dust actually did anything for my garden. Now I know the answer. It amazes me how many times people tell you to add it to the garden on YouTube videos. Thank you for clearing things up. Unfortunately, YouTube is becoming congested with rubbish. The same sensationalism that worms in magazines and web sites is getting lots of views on YouTube.

I have 50lb bag of azomite in my garage, waiting for my spring garden.

Is Rock Dust a Fertilizer?

Do you think it would work as a dust to protect the plants from aphids and the like? Funny — I just wrote that — the grandchildren part — as a reply to another comment. One thing the only thing? There is not a finite number of garden myths. Social media is creating them far faster than I can write about them.

Remineralize Your Garden Soil with Rock Dust & Compost

Here is a nutrient test on a commercially available compost, including minerals. That is correct. Since most plants use the same minerals to grow — all plants contain the minerals. Compost made from plants which includes things like manure will contain all the minerals plants need. Press here to subscribe.


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Garden Myths - Learn the truth about gardening. The use of rock dust is not new. The Hardin Brothers in Queensland Australia have been using rock dust more than 20 years. Greensand, a common soil amendment, is just dust from sandstone rock that was deposited in marine environments. How does rock dust work best? Rock dust is most effective when mixed with organic compost and a handful of soil to add some microorganisms. The microorganisms feed off the rock dust, taking only the nutrients they need while leaving the remainder in the sub-soil.

On a Fad Diet of Rock Dust, How the Garden Does Grow - The New York Times

The compost provides the medium for the microorganism growth. Optimally, the rock dust and compost mixture should be incorporated into the top few inches of soil if possible but may also be spread by broadcasting or spread by hand if you use a no-till method of gardening.

It is not totally necessary to add the rock dust mixed with compost. The dust alone may be added and raked in, or tilled in. The addition of compost just gives the rock dust a head start as food for the microorganisms.


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  • An interesting benefit of adding rock dust is that it will help create more organic matter, which in turn helps hold the soil in place and conserve water. Soil erosion is an effect of the shortage of minerals to support the soil organisms. When that is done, the soil microorganisms begin to multiply and it is they who prevent soil erosion by granulating the soil and holding it against both wind and rain. Unfortunately I have not been able to locate the copyright holder to get permission to use the photo here. Masonry sand and sand made for sand-blasting procedures are too coarse and will not be as effective in your garden, taking longer to break down.

    Rock dust from a gravel pit is usually unscreened but about the right size. Locally, I have granite dust available from the gravel pits, which is okay to use but not best. The mixed gravel dust from the local stream beds is better. A better yet rock dust comes from glacial gravel or volcanic rock like basalt. Another is montmorillonite. Mineral Rocks. If ordering Compots it is cheaper to add 1kg of product to your order rather than buying it separately as the weight does not change the postage rate of your parcel.

    It is also cheaper postage wise to purchase a bucket or box of Garden Supplements with your order of Compots. For larger quantities more than 20kg you will need to fill in a custom quote form. You might want to use this option to try several different products before buying larger quantities.

    Email your preference here. If for any reason you fell the postage to your area is excessive and sometimes to remote areas it is please email us or go to this link at Australia post — and see if the postage is better using the box dimensions and weight listed above, plus your area code and suburb and our area code and suburb New Farm. Back to product page. All care is taken to produce a quality product that will nourish and replenish your garden giving you years of healthy crop production and increase the yield of your crop especially if you are a farmer.

    Article on Mineral Rock Dust.