Public domain preparation

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About the Preparation -

Preparation name
Biodynamic 'field' preparation 500 - horn manure
Preparation category
Public domain formulation
General description
The manure inside the horn becomes pervaded with forces which gather and attract from the surroundings all that is ethereal and life-giving [and so] becomes inwardly alive. Thus in the content of the horn we get a highly concentrated, life-giving manuring force. It brings ego potentiality to the soil.

Effect on Plants -

Effect on Soil -

Soil characterisation

Organic matter faction (197)

Soil structure (197)

Increased humus (302)

Radioactivity (953)

Drought (1039)

Compensation for lack of lime (1041)

Soil surface

It is sprayed out in large droplets over soil .. being cultivated (35)

Under drought conditions, application of a fine mist of horn manure to the crops in the late evening or early morning will reduce or prevent damage. (34)

Preparation 500 will accelerate the breakdown of DDT (44)

It should also go on with stubble or green manures, and its use then enables many of the detrimental effects of green manure to be avoided. (197)

spraying 501 along with 500 on the soil of a winter afternoon in big droplets is an absolutely wonderful thing to do as it really builds up the silica forces for a great spring start (3/3/2010) (58)

My soil has improved tremendously; generally all over the garden the soil is taking on a better structural quality whereas before it was like the soil had no structure at all. (429)

... but the ground I've really noticed improvements in, is the new ground; it has changed dramatically. It has a new colour to it. Everyone notices it and they comment on how good it looks and what good soil I've got. I can really see the difference. (429)

After the reactor accident in Chernobyl in 1986 .... we immediately treated the arable land with horn manure (BD 500) and horn silica (BD 501) ...... Three weeks later two scientists came with various instruments to measure the radioactivity. All fields and pastures were tested, all animals and all our products (including the milk) were tested. The results showed no real increase of radioactivity over natural radiation which is always present. Measurement of our neighbour's farm showed a radiation in crease of 13%. The result on our farm was unbelievable for the scientists. One of them kept returning to find out how this could be explained. He observed the extraordinary effect of our spray preparations, and started to experiment with them himself, confirming their efficacy. (953)

Also for an example of how well it works. A farmer prepared a large piece of land on a friend's farm to grow vegetables. But then he moved to a new farm and left. I then spread one biodynamic preparation 500 on the land. Then he came back about 5 or 6 months later to visit and he checked the soil and nearly fell over he said in his whole 20 years of working in conventional farming he'd never seen such a change in soil quality like this. (1869)

The stable organic matter content of the soil increases. Soil structure rapidly improves and the roots penetrate more deeply. Within six months of a vineyard being treated (18th April – 11th December) with preparation 500P (horn manure to which the six compost preparations have been added), the soil became darker, more crumbly, was less sticky and held water better. Our results have been steady and reliable. (1870)

Top soil

It is designed to work only underground on three factors ... microbial activitty, humus formation and root growth. (21)

[Primary use is ...] during soil cultivation, on grassland, pastures, winter cereals ie before any new crop; before sowing or planting out; on freshly grazed or cut grassland. (35)

Its purpose is to promote root activity, to stimulate the soil micro-life, to regulate the lime and nitrogen content of the soil, and to help in the provision of trace elements (36)

.. an immensely concentrated fertilising power for the soil; root growth and primary shoot development are specifically enhanced. (34)

There is an increase in structure, water holding capacity, humus formation, and generally in all micro-organisms such as rhizobium ... mycorrhizal fungi, algae, actinomycetes and protozoa .. and macro-organisms such as nematodes, springtails, mites, ants, millepedes and earthworms. Soil pH rises to the range of 5.8 to 6.5 then stays at that level. This improvement takes place whether it is clay, peat, sand, colcanic or silty loam. (44)

Controlled tests show that 500 brings an increase of organic matter in the soil, and a decrease of acidity. On Dr Pfeiffer's farm in Chester NY there was in 1944 an acid soil everywhere, with organic matter less than 3% in 23% of the area, and between 3% and 4% on 47% of it. Now (after 4 years) where 500 has been applied, there are no fields with less than 2% organic matter and more than half of those that formerly ranked as poor have increased to good; there is an increase in the area showing 4-5 %, over tow thirds of the farm now being better than 4% of organic matter. But this happens only where 500 is applied properly. One would be a fool not to use it[!] It use amounts to doubling the effect of the manure ... two thirds of this is produced by life in the soil. (197)

Preparation 500 is sprayed in high dilution upon the soil with the object of enlivening it, of stimulating the life processes in the soil and thereby increasing its humus content. (302)

We have had severe drought this last year. We have sandy ground yet we had no need to water this last year. We gave 500 on Monday, Tuesday and Wednesday, then rolled the ground. After 5 days it had become hard below, but not on the surface. With our preparations we can bring about a proper regulation of the moisture required by the plants. (1039)

The effect of treatment 500 shows statistical results for humus percentage. In the 6 years interesting was the level of humus that was decrease by 500 on 3 sites; only 1 showed an increase. What can tell us? Is against the Bd theory literature! In fact only one site apported green manure, manure or Bd compost and this let us conclude that 500 need an organic substrate to grow and increase soil respiration. So we had an effect, and in the others 3 sites the 500 mineralized the humus-organic composition of the soil! To confirm this hypothesis the results on soil aggregate and microbial activity follow this "red line" in sites analyses showing results just for one site. (1502)

The bacterial diversity was significantly higher in biodynamic manures compared to compost without discernible differences in abundance. Fungal diversity was not significantly different while abundance was increased in biodynamic manures. The microbial communities of biodynamic manures and plant preparations were specific for each production site, but all contain potentially plant-beneficial bacterial genera..... When applied in apple orchards, biodynamic preparations (extracts) had the non-significant effect of reducing bacterial and fungal abundance in apple rhizosphere (4 months post-application), while increasing fungal and lowering bacterial Shannon diversity. One to four months after inoculation, individual taxa indicated differential abundance. We observed the reduction of the pathogenic fungus Alternaria, and the enrichment of potentially beneficial bacterial genera such as Pseudomonas. (1574)

The research revealed that significantly the highest concentrations of available phosphorus, available potassium, nitrogen and mineral nitrogen in the soil throughout the growing season were identified on the 14th day after soil application of BD preparation 500 (before potato planting). As well as, soil spray application of BD preparation 500 resulted in higher enzyme activity (urease and saccharase). (1610)


The water penetrability and moisture holding capacity of the soil will be increased over the years, to a point where some farmers claim at least 25% less irrigation requirement. Tests for water infiltration (Livick 1991) were carried out in comparison between biodynamically and conventionally managed orchards in New Zealand... In the biodynamic orchards water soaked away between 2 and 4 times as fast. (44)

A further effect of 500 is a change in structure of the soil, with an increase of porosity. This effect of 500 has been shown by laboratory tests, It is produced by compost too, and also by the preparations 502-507 if diluted and used as sprays. This was discovered in the laboratory incidentally. It is a remarkable discovery. (197)

Notes and Academic Papers

The effect of 500 last longer than 501 (21)

Afternoon and evening are .. the right time for spraying horn manure. Applying the horn manure preparation at this time [November and Decemeber], weather permitting, has proved particulalry effective. The soil should not be frozen or covered with snow. (34)

Apply the 500 in the afternoon .. in a descending period of the Moon rhythm .. 25g of the preparation in 13 litres of water per acre within an hour of stirring. This can be reduced proportionately for larger acreages. The practice in Europe is to apply 500 only on bare land. However, New Zealand and Australian farmers have found that it is also effective when sprayed on grass - even on long grass. Sometimes bloating stops as soon as you start to use 500 on the pastures. (44)

This stirring Rudolf Steiner said must be done first one way round then the other, holding the stirring stick in the right hand when stirring clockwise and in the left hand when stirring anti-clockwise so that one always stirs from the heart outwards. The stirring must be vigourous enough to form a funnel or vortex almost to the bottom of the bucket, you then change hands quickly and stir the other way around. The changeover is important as it brings a moment of chaos into the substance which allows the entry of cosmic forces. [Karl Lang - "The Early Days"] (195)

To begin with 500 should be applied twice yearly, in spring and autumn. Later, once a year. It should not be applied on dry soil, tfor then there is no active soil life. The life in the soil shows a maximum about April-May, and another on October-November. The best time to apply 500 then is about `March when the frost is out of the soil and again in the Autumn before the temperature is low enough to inhibit soil life. (197)

BD 500: Basic lime polarity-calcium, nitrogen fixation, digestion, nutrient elaboration and transformation. Builds a healthy soil foodweb and maximizes soil organization. (7)

Lily Kolisko's research on which potency yields the best results suggested the 6th or 29th potencies might be best. (294)

A compensation for calcium has been sought through the application of bio-dynamic preparations 500, 503 and 505. These preparations strengthen the resistance of a plant against calcium deficiency. (1041)

Effects on Compost and Manure -

Notes and Academic Papers

The cow horn manure contained highest amount of nitrogen (2.08, 2.12 and 2.17%), recorded on 90th 105th and 120th day, whereas the phosphorus (0.64 %) and potassium (0.47%) contents were high on 90th day. (1567)

The fermented manure derivative known as Preparation 500 ....was found to harbor a bacterial community of 2.38 × 108 CFU/g dw dominated by Grampositives with minor instances of Actinobacteria and Gammaproteobacteria. ARISA showed a coherence of bacterial assemblages in different preparation lots of the same year in spite of geographic origin. Enzymatic activities showed elevated values of β-glucosidase, alkaline phosphatase, chitinase, and esterase. The preparation had no quorum sensing-detectable signal, and no rhizobial nod gene-inducing properties, but displayed a strong auxin-like effect on plants. Enzymatic analyses indicated a bioactive potential in the fertility and nutrient cycling contexts. The IAA activity and microbial degradation products qualify for a possible activity as soil biostimulants. Quantitative details and possible modes of action are discussed. (1589)

* Horn quality, as evidenced in the weight/ volume aspect, appears to be very determinative of final quality. Poor horns give results nearly identical to artificial (non-horn) controls. * Initial manure characteristics do not appear to exert a major influence on the apparent quality. There are large decreases in odor, anaerobic conditions and ammonia during the prep 500 process. * Favorable preparation results are associated with lowered CO2-activity and a higher nitrogen retention in the prepared manure. (1646)

Across multiple experiments we observed significantly higher total nitrogen, higher nitrate, lower pH, and lower respiration in manure buried in horns compared to jars. Furthermore, there was an inverse relationship between nitrate and pH, possibly due to the stoichiometry of nitrification. In one experiment, a mass balance calculation indicated no significant loss of nitrogen in the horns compared with 37% loss in the jars. (1696)

Effects on Climate -

Notes and Academic Papers

As far as the preparations can do anything in relation to the ozone hole use the BD preprations, especially 500 .... (48)

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