Dolomite flour composition and method of its use

Nowadays there are many different fertilizers of natural origin. When used on a personal plot or a summer cottage, the harvest will always be wonderful and environmentally friendly.

Dolomite flour is one such fertilizer. But not many people know how to use dolomite flour.

What is dolomite flour, methods for determining the acidity of the soil, which you can use to find out its degree in your area, how to feed your beds with lime or stone flour, how to use limestone flour, how to properly fertilize the soil.


  1. Dolomite flour - what is it?
  2. How to determine the acidity of the soil
  3. Which is better - dolomite or lime?
  4. Dolomite flour application
  5. Methods of application to the soil

Dolomite flour - what is it?

Many novice gardeners are interested in: what is dolomite flour, how to use it? This fertilizer has been used as a top dressing for horticultural crops for a long time.

It is a powdery substance that is obtained by crushing and grinding dolomite. The formula for this substance looks like this: CaMg (CO2) 2. Calcium is the main active ingredient.

The main reason for soil acidification is the combination of calcium atoms with hydrogen. To improve the quality indicators and stabilize the acid indicator, it is necessary to artificially saturate the soil with hydrogen and minerals. The use of stone flour helps in this.

In addition, the fertilizer can be used in the fight against pests with a chitinous cover and in reducing the acidity of soils in garden plots. The fertilizer contains a lot of fine particles, therefore, work on its introduction into the soil should be carried out in calm weather, protecting yourself with a respirator and goggles.

How to determine the acidity of the soil

The acidity of the soil is determined by pH - the strength of the potential of hydrogen - this is how this designation is literally translated from Latin. Its indicator is in the range between 0 and 14th. The original concept of acidity was introduced to science in the first half of the twentieth century. Acidity indicators were used to determine the acidity of alcoholic beverages. Over time, these parameters have been successfully applied in agronomy.

With normal acidity, the pH will be 7. The pH of a very acidic soil will be 4, strongly acidic from 4 to 4.5, moderately acidic 4.5-5, and slightly acidic 5-5.5. If the acidity of the soil exceeds the value of 7, it will cause an alkaline reaction.

What effect does soil acidity have on plants? Any plants absorb nutrients found in the ground. Their content in the ground is completely dependent on the pH. Most cultivated plants prefer to grow on soils that have an acidity index of 5 to 8.

In addition, the fruits that have grown in acidified soil taste sour. There are several simple methods that can be used to determine the degree of acidity of the land in your backyard area.

In appearance: it is necessary to carefully consider the land on the site. When acidified, it will have a rusty or reddish tint. The puddles formed in the area where the soil is highly acidified will have a thin iridescent film on their surface.

In addition, it is possible to determine that the soil on the site is acidic by the weeds growing on the territory of your site, because each of them will grow only in the place where the soil has the necessary acidity indicator for this.

In the beds where the soil has a high pH, ​​the following will grow: horse sorrel, cornflower, tricolor violet, highlander, pikulnik, Ivan da Marya, plantain, field horsetail, Veronica oakgrass, cinquefoil, heather, creeping buttercup, mint, daisy. Almost always, soils with a high degree of acidity are highly moist.

Soils with low acidity are suitable for the growth of completely different plants: wheatgrass, bird knotweed, chamomile, alfalfa, burdock, coltsfoot, wild rose, woodlice, willow, sow thistle.

When the acid index of the soil has a neutral pH value, you will be told about it: red clover, quinoa, nettle. When nettle grows in large quantities in the garden, it is an indicator that the soil contains a large amount of acids of organic origin. They can be of great benefit for the development of horticultural crops.

In the garden, where the soil is poor in minerals and has a high degree of density, there will often be found: resin, thistle, sweet clover, mustard, euphorbia.

The alkalized areas are usually inhabited by field bindweed and poppy.

A similar method will help establish the acid level of the weeds that prevail in the garden.

The Klychnikov method is a simple method with which you can establish the acidity of the soil yourself:

  • You need to take a couple of handfuls of earth from your site.
  • Dry and pour into the bottle, halfway.
  • Then wrap a small amount of chalk loosely in paper and lower it on the ground that is in the bottle.
  • You need to put a fingertip on the neck of the bottle. It should be flat with no air. If not, then you can take a finger cut off from a medical glove. The main thing is to fix it tightly on the bottle.
  • After all, you need to shake the bottle so that the chalk can get enough sleep from the piece of paper and mix with the ground.
  • With a high acidic value of the earth, carbon dioxide will begin to be released from interaction with chalk, pressure will begin to rise inside the bottle and the empty fingertip will be filled with the released gas.
  • The acidity level is determined by the degree of swelling of the fingertip. If it is swollen well enough and some resistance is felt when pressed, then the earth is highly acidic. At medium pressure, it is slightly acidic.

Vinegar can also help in determining the acidity of the soil. It is necessary to pour a small amount of earth on the glass and pour it with vinegar, the concentration of which is 9%. When foam appears, the earth can be considered alkaline. When a small amount of foam appears, the earth is slightly acidic, and if there is no foam at all, it is acidic.

Which is better - dolomite or lime?

Dolomite is a mineral that has a crystalline structure. It is variously colored and shimmers in the sun. It can be painted gray, reddish, brown, white. When grinding this mineral, dolomite flour is obtained for fertilizing in the garden, which contains a large amount of magnesium and calcium oxide.


  • horticultural crops are provided with food;
  • get the opportunity to develop better;
  • destroys some harmful insects;
  • the yield and quality of the grown crop increases;
  • the shelf life of the resulting crop increases;
  • neutralization of radioactive compounds occurs;
  • promotes photosynthesis;
  • helps with the formation of a powerful root system;
  • has an affordable price.


  • Not suitable for all plants;
  • there is a danger of overdose.

Lime is obtained by processing chalk and limestone. It, like dolomite, contains calcium and magnesium. Thanks to these components, it is often used for soil deoxidation, pest control and feeding of cultivated plants.

Lime is soda, magnesian and dolomite, slaked or quicklime. Slaked lime is very popular, because in this form it is not so dangerous for plants.

To slake lime, it is necessary to fill it with cold water, but the container must be closed, because this process proceeds with the release of heat and lime boiling. At the same time, it can splash out on the sides.


  • lime helps plants to resist disease, thanks to the calcium content, which increases their resistance;
  • the presence of lime in the soil contributes to the development of nodule bacteria, and this retains nitrogen in the soil, which gets into it during weeding along with the air;
  • when creating compost pits, the work of beneficial microorganisms is activated. This occurs when exposed to the calcium contained in the lime. Bacteria help to release nitrogen, which is then mineralized;
  • humus is formed due to the same calcium, it is a catalyst that accelerates the decomposition of substances of organic origin;
  • helps to maintain the neutral acidity of the soil.


  • the biggest disadvantage is the use of quicklime. It harms microorganisms. When introduced into wet soil, the process of its extinguishing is started

If you choose between dolomite flour and lime, no one can give an unequivocal answer, and if you compare the amount of calcium contained in their composition, then lime contains 8% less than limestone fertilizer.

After all, calcium helps to improve the structure of the earth and the formation of strong roots in plants. Lime in its composition contains significantly less magnesium than crushed rock, namely, it promotes photosynthesis in plant leaves.

Dolomite flour application

The use of dolomite flour in the garden not only normalizes the acidity of the soil, but also helps gardeners get a lot of advantages:

  • improve the quality of the soil structure;
  • saturate the upper layers with nitrogen, phosphorus and potassium;
  • helps to develop beneficial microorganisms;
  • increases the level of calcium and magnesium contained in the earth;
  • accelerates the removal of radioactive substances from plants;
  • helps plants assimilate nutrients;
  • activates photosynthesis.

To use dolomite flour in order to deoxidize the soil, it is necessary to strictly observe the application rates, because an overdose will significantly change the acid-base characteristics of the soil, which can adversely affect the cultivation of plants.

Limestone flour is practically safe, but in order to achieve the best results from its use, you must carefully study the instructions for use.

Methods of application to the soil

It is best to use dolomite flour in the fall, but if absolutely necessary, it can also be used in the spring and summer.

This finely ground fertilizer is often used as a spray solution for plants. It effectively helps fight pests because it destroys the chitin that makes up their shells.

To apply fertilizer per 1 m2 of highly acidified soil, 600 grams of fertilizer will be required, for moderately acidified - 500 grams, and for slightly acidified - 350 grams. In case of loose soil, it is necessary to reduce the amount of applied fertilizer by half, and in case of heavy clay or muddy soil, increase it to 20%.

For greater efficiency, limestone flour must be distributed evenly over the entire area of ​​the site, and then dug or plowed to a depth of 15 centimeters. If it is not possible to dig up or plow, the fertilizer can be scattered over the site, but with this application option, the effect of it can be seen only after a year.

With the correct application rates, it will last up to eight years.

When using crushed limestone in greenhouses, it must be evenly distributed over the surface of the ridges. You need to bring in at the rate of 200 grams per square meter. But in this case, the soil does not need to be dug up, because dolomite in this case is necessary to create a film that will retain moisture.

We are watching an interesting video about the use of dolomite flour:

Watch the video: ANDRITZ thickening and clarifications systems (January 2022).