How to dissolve bluestone for processing tomato

Each gardener wants to grow on his site a rich harvest of environmentally friendly tomatoes. Unfortunately, it is not always possible to avoid the use of chemicals for fertilizing, treating plants from diseases and pests. The assortment of means of chemical protection of tomatoes is growing every year. Among them are many copper-containing drugs.

Many vegetable growers with extensive experience in growing tomatoes in open and protected ground prefer treatment of tomatoes with copper sulphate from late blight. These are necessary measures, especially if tomatoes are grown in the greenhouse. It is not a secret for anybody that the humidity of the air is difficult to settle, therefore phytophtora are here for reproduction.

What is bluestone

Copper sulfate is a substance of inorganic origin. In chemistry, it is called the salt of copper sulfate. If you open the package with the substance, you can see the blue crystals. Dissolving in water, paint it in a sky-blue color.

You can buy copper sulphate in specialized or hardware stores. Packaging may be plastic or in a bottle. Packing from 100 grams to 500. Store the substance in a dry dark room. Otherwise, it will lose its properties.

It is widely used in agricultural technology of growing vegetables and fruits in small homestead farms and large agricultural enterprises, as fertilizer, and a means of processing premises, soil and plants from various pests and diseases.

Dissolved crystals have fungicidal, insecticidal and antiseptic effects. In addition, copper is necessary for plant development as a fertilizer.

Important! Copper is actively involved in oxidative and metabolic processes. If this trace element is not enough, the plant feels depressed.

Infections, including late blight, most often affect plants with reduced immunity. Tomatoes will not give the desired yield, and the taste of the fruit will decrease.

In which cases resort to copper sulphate

In no case can not engage in the processing of tomatoes with copper sulfate, without assessing the condition of the soil and plants.

It often happens that the soil on the site contains a minimum amount of humus or there is too much sand in it. Plants do not receive the necessary nutrition, weaken, can not resist diseases and pests.

If the purpose of processing tomatoes is to increase the fertility of the soil, then the copper sulfate in dry form is mixed with the soil before digging. It is best to perform such work annually in the fall. For one square meter is enough one gram of crystalline substance.

Attention! If the soil is fertile, copper sulfate is used once every five years to destroy spores of the phytophthora.

Experienced vegetable growers do not so often resort to the use of copper sulphate for the treatment of tomatoes from late blight. After all, they correctly use the crop rotation, planted on the site siderats.

Blue copper solution is used for spraying with foliar feeding of tomatoes. Copper starvation can be identified by whitish spots on the leaves, weak growth of shoots or their dying off. Such processing of tomatoes with copper sulphate is carried out in early July. In a ten-liter bucket dissolve one gram of blue crystals.

A warning! When preparing the solution, it is necessary to observe the dosage.

If you ignore the instructions and add more copper sulfate, you can burn the plants. The leaves will turn black, and the tomatoes themselves will either die or their growth will slow down significantly. When processing tomatoes with a solution of copper sulphate of lower concentration do not get the expected result.

Breeding rules

Before you start processing tomatoes with copper sulfate, you need to carefully read the instructions. From this substance, it is possible to prepare formulations with different percentages of vitriol. To prepare the stock solution, take 100 grams of blue crystals and one liter of warm water. After the copper has dissolved, the volume of liquid is adjusted to 10 liters. This will be a 1% copper sulphate solution. To get 2% you need 200 grams per 10 liters of water, and so on.

Tip! The solution must be drained before pouring into the sprayer so that the grains do not clog the nozzle.

Most often for the treatment of tomatoes prepared Bordeaux liquid. And now about how to dissolve the bluestone for processing tomatoes.

Step-by-step recommendations:

  1. For breeding it is better to use dishes from plastic. First, the gram package of vitriol is dissolved in a small amount of warm water. When the blue crystals completely dissolve, the amount of water is adjusted to five liters.
  2. In another plastic bucket you need to put 150-200 grams of lime and add 5 liters of water. It turns white liquid, reminiscent of milk. The mixture must be thoroughly mixed.
  3. In a calcareous milk pour a blue solution of copper sulfate in a thin stream.
    Be careful: it is the bluestone in the lime, and not vice versa.
  4. The solution must be constantly stirred. The result is a cloudy suspension.

How to make Bordeaux liquid:

Attention! The effectiveness of copper sulfate is reduced if the air temperature is above +15 degrees.

How to treat the soil

No one will dispute the fact that it is in the ground that there are pests, nematodes and disease spores. Therefore tillage is necessary. She also performed in the fall. You can treat heavily contaminated soil with formalin solution (40%). You cannot enter the greenhouse for three days, then you need to air it for a day. For spraying greenhouses preparing a one-percent solution of Bordeaux mixture. If the treatment is carried out in the spring, then a month before the plants are placed in the greenhouse.

To destroy not only late blight, but also powdery mildew, bacteriosis, tomato spots, calcium hydroxide is added to the Bordeaux mixture.

For cultivation of land in the usual beds composition of the copper sulphate solution is prepared identically.

Safety regulations

Since copper sulphate is a chemical substance, it is important to follow safety rules when working with it.

Let's talk about this:

  1. Use at cultivation of copper sulphate for processing tomatoes any dishes other than metal.
  2. Ready solution is not subject to long storage. After nine hours, the ego's efficiency drops sharply, and after 24 hours it is zero.
  3. During the processing of tomatoes with a solution of copper sulfate from late blight, remove the animals.
  4. For spraying tomatoes, earth, the surface of the greenhouse is better to use special sprayers.
  5. When working with the drug, use at least rubber gloves. Do not interfere with glasses and respiratory protection.
  6. After doing the work, wash your hands, face, other exposed parts of the body with warm water and soap.
  7. Store bags of copper sulfate in a place out of reach of children and animals.


If you want healthy tomatoes to grow in your greenhouse or in the open field and give a big harvest of tasty healthy fruits, do not forget about the processing of plants, the surface of the greenhouse and the ground to destroy phytophthora.

As a rule, vegetable growers for this purpose use solutions containing copper sulphate. This is a great helper in feeding and processing of tomatoes from late blight and other fungal diseases. But since it is a chemical, care must be taken when using it.

Do not forget about the dosage. Preparation of a solution of copper sulfate, Bordeaux or Burgundy liquid is unacceptable by eye. Overdose will adversely affect the condition of tomatoes. A large amount of copper is unacceptable for soil.