Agricultural and commercial literature.


Here at Davley Organics we strive to make the scientific data, reports and articles as digestible as possible.

We know our farmers and commercial users are busy and always on the move, so if you don’t have the time to peruse our site, please find below links to all the most pertinent documentation to download and read when you have the time.

We start with the basics, going through to the longer and more comprehensive scientific data.

PDF_Logo - icon Benefits of Vermicast in point form


American-Eurasian Journal of Agricultural & Environmental Sciences

Special Issue on


List of Contents

1). The Concept of Sustainable Agriculture: An Issue of Food Safety & Security for People, Economic Prosperity for the Farmers & Ecological Security for the Nations

2). Earthworms : The ‘Unheralded Soldiers of Mankind’ & ‘Farmer’s Friend’ Working Day & Night Under the Soil: Reviving the Dreams of Sir Charles Darwin for Promoting Sustainable Agriculture

3). Earthworms Vermicompost : A Powerful Crop Nutrient Over the Conventional Compost & Protective Soil Conditioner Against the Destructive Chemical Fertilizers for Food Safety & Security

4). Vermiculture Can Promote Sustainable Agriculture and Completely Replace Chemical Agriculture : Some Experimental Evidences by Studies on Potted & Farmed Cereal & Vegetable Crops.

5). Environmental – Economics of Crop Production by Vermiculture: Economically Viable & Environmentally Sustainable Over Chemical Agriculture

6). References & Further Readings

American-Eurasian J. Agric. & Environ. Sci., 5 (S): 01-55, 2009
ISSN 1818-6769
© IDOSI Publications, 2009

How Sustainable Soil Science Can Help Rescue Our Environment and Food Supply.


an excerpt from:

How Organic Farming Could Release Us From the Curse of Fertilizer. July 02, 2013 By Dr. Mercola

Read the full article here.

logo-mercolaAll credit to the author By Dr. Mercola and the excerpt is re posted in its original state.


I recently interviewed Dr. Elaine Ingham,8 an internationally recognized expert on the benefits of sustainable soil science. I also recently visited her at her new position at the Rodale Institute in Pennsylvania. According to Dr. Ingham, a key component of successful agriculture lies in having the right helper organisms in the soil; beneficial species of bacteria, fungi, protozoa, beneficial nematodes (not the weedfeeders), microarthropods, and earthworms—all of which contribute to plant growth in a number of different ways.

Nutrient cycling is another major issue. According to Dr. Ingham, there’s no soil on Earth that lacks the nutrients to grow a plant. She believes the concept that your soil is deficient and needs added phosphorus or nitrogen etc in order to grow plants is seriously flawed, and largely orchestrated by the chemical companies, because it’s based on looking at the soluble, inorganic nutrients that are partly present in your soil.

The real nutrition your plants require is actually derived from microorganisms in the soil. These organisms take the mineral material that’s in your soil and convert it into a plant-available form. Without these bioorganisms, your plants cannot get the nutrients they need. So what you need is not more chemical soil additives, what you need is the proper balance of beneficial soil organisms. According to Dr. Ingham:

“It’s very necessary to have these organisms. They will supply your plant with precisely the right balances of all the nutrients the plant requires. When you start to realize that one of the major roles and functions of life in the soil is to provide nutrients to the plants in the proper forms, then we don’t need inorganic fertilizers. We certainly don’t have to have genetically engineered plants or to utilize inorganic fertilizers if we get this proper biology back in the soil.

If we balance the proper biology, we select against the growth of weeds, so the whole issue with herbicides is done away with. We don’t need the herbicides if we can get the proper life back into the soil and select for the growth of the plants that we want to grow and against the growth of the weedy species.”

Interestingly enough, you can use a starter culture to boost the fermentation and generation of beneficial bacteria much in the same way you can boost the probiotics in your fermented vegetables. For compost, this strategy is used if you want to compost very rapidly. In that case, you can use a starter to inoculate the specific sets of organisms that you need to encourage in that compost.

For optimal physical health, you need plant foods to contain the full set of nutrients that will allow the plant to grow in a healthy fashion, because that’s the proper balance of nutrients for us human beings as well. Dr. Ingham has written several books on this topic, including The Field Guide for Actively Aerated Compost Tea, and The Compost Tea Brewing Manual.

[-] Sources and References

Q&A – Your questions answered by David of Davley Organics.

So, what is vermicast?

Vermicast is the product of decomposed organic material going through the gut of an earthworm. Earthworms process compost and release the nutrient within it in a format that is more accessible to plants to be effectively absorbed.
The largest amount of Nitrogen in vermicast is available in plant available formats, Nitrate (NO3) and Nitrogen Dioxide (NO2), whereas the largest amount of Nitrogen in compost and manure is in its Ammonium (NH4) format.
NPK (Nitrogen,Phosphorus,Potassium) concentrations will depend on the concentrations of these elements in the worm feed. The important key here being that the worms process it into a format that plants can absorb quicker, more effectively and in greater volumes.


Why is Davley Organics Vermicast better than your standard garden store compost or fertiliser?

Compost is simply decomposed organic material, whereas, Vermicast is the excretion produced by earthworms, it is a compound that is a fertiliser rather than a compost.
In addition to this, Vermicast enhances and re-conditions soil structure, in other words it will improve the water retention properties of a sandy soil and improve the drainage properties of a clay soil.
Its third and most important feature, is that vermicast is not just a fertiliser, but a living fertiliser containing microbes, these organisms have multiple positive effects for the plant. One being to aid in the absorption of nutrients. Microbes attaching themselves to the root hairs of a plant, absorb water and nutrients, then pass it on to the plant. Secondly, these organisms provide the NPK nutrients that plants require, in a format that is easily absorbed.

Is vermicast more expensive or the same as chemical fertilisers?

When looking at cost it is always important to compare apples with apples so to speak. Gram for gram vermicast is not expensive when compared with chemical fertilisers, but the comparison in itself is not fair. The following must be understood when looking at vermicast as opposed to a chemical fertiliser.
1. Chemical fertilisers provide nutrients for the plants and the plants only, they do nothing for the soil in terms of improving the soils quality or improving its ability to retain or drain moisture. Even slow release chemicals will eventually leach away in the soil over time.

2.Vermicast acts as a soil conditioner and has rehabilitative properties as well as providing the plants with nutrients which aid and improve growth and health.

3.Chemical fertilisers work well to boost certain nutrient levels for a plant but cannot provide sustained nutrition and soil rehabilitation the way vermicast can. We are not opposed to combining certain chemical fertilisers in the feeding regime of certain crops with vermicast, but it must be understood that vermicast provides far more long term positive effects than being a mere fertiliser.

4.Our product specifically contains earthworm eggs and baby worms. This means that our vermicast is a living fertiliser that will replicate itself in the biome of its final destination if the correct conditions are put in place. i.e enough moisture and compost for the worms to process.
What this means on a cost level is that you will have fertiliser ongoingly being produced in the area that you apply it. Worms reproduce quickly, so given the right conditions they can quickly populate your flower bed or veggie garden, thereby radically improving its soil quality and nutrient base. (How can you compare a self replicating fertiliser system to a chemical alternative?)
Vermicast is a natural fertiliser, and because it is the way nature intended, it works 100% with the natural balance and functions of the ecosystem. We believe it to be the most efficient thing to use.

How about bugs, does vermicast reduce the instances of pests on the plants?

Vermicast acts as an immune system booster in plants, they are more resistant to attacks from bugs, fungi and other plant diseases. Even when they are attacked by bugs they recover a lot quicker and show less signs of long term distress.Bugs tend to attack plants that are in a weakened state as the cell walls are softer and more easily digested. Plants being fed vermicast are thus less appetising for bugs.

What is the benefit of  Worm Tea?

Worm tea has 2 specific benefits:
1. It works well as a foliar feed and is an excellent additive to boost the plants in Spring or to nurture them in Winter. The microbes that filter down to the roots will provide the same benefits as those in vermicast.

2. Worm tea works well in hydroponics as a liquid fertiliser and also in potted plants where you do not want worm colonies breeding out and causing the plant to become too root bound because of the restrictive growth area.

Can you use just one or the other?

My recommendation is the following: Vermicast is your primary option for planting in a flower bed or veggie garden etc. Worm tea can be added to these plants in these settings as a booster but will be less effective if applied on its own. Remember you want to create a fertiliser generating colony in your garden, orchard or plantation.

Tea is very effective in instances like hydroponics or potted plants where it is applied as a  liquid fertiliser instead of vermicast and as an added booster to plants already being fed vermicast.
Worm Tea is like rocket fuel for plants in a similar way that fertiliser is, the difference being that Worm Tea has the added benefit of the microbes that support the plants development.