Fertilizing tomatoes with superphosphate

Solanaceous crops, which include tomatoes, require balanced nutrition with mineral fertilizers for full growth. Among effective complex fertilizers, superphosphate is isolated. It is used for seedlings and for adult plants. Topping tomatoes with superphosphate will improve their overall growth and fruiting.

Fertilizing tomatoes with superphosphate

Properties and Views

Universal complex fertilizer is widely used in gardening. The main components:

  • phosphorus;
  • nitrogen;
  • sulfur;
  • calcium;
  • trace elements.

The percentage of substances in it ranges from 25-55% phosphorus, 8-17% nitrogen, 5-10% sulfur. These indicators depend on its variety.

These types are distinguished:

  • plain;
  • granulated;
  • double.


Simple is produced in the form of a gray powder. The amount of phosphorus is 25-30%. Universal application, suitable for autumn application for garden crops. Slowly soluble in water.


Granular differs in the form of fractions. Produced in the form of granules by rolling from a moistened powder. By the quantitative composition of the active substances does not differ from simple. It is convenient to use such superphosphate for tomatoes, for which top dressing is applied directly to the hole or planting row.


Double more concentrated, freed from the ballast content of CaSO4. Contains 40-55% phosphorus. Used in different phases of plant growth. It is soluble. Most often, tomato seedlings are fed with double-acting superphosphate.

Benefits for Tomatoes

Relate to long-acting drugs. Phosphorus and nitrogen are essential elements for the nutrition of tomatoes. It is acquired by plants slowly and only in that quantity which is necessary. When using such a substance, it is observed:

  • germination improvement;
  • development of a healthy root system;
  • intensive growth and green mass gain;
  • increase in the number of fruits;
  • improving the color, size and shape of the fruit.

The use of mixtures allows the root system to become more powerful.

Application is made at different stages of soil preparation for planting tomatoes. As well as in different periods of growth.

Fertilizers are applied to improve the quality of depleted soil, in cases of low-mineralized soil with phosphorus deficiency. In plants grown on this soil, growth retardation is observed. Such top dressing is carried out in the fall or in the spring before planting seedlings on the bed.

Fertilizer can be added to the wells before planting

During the period of active growth, fertilizing superphosphates of growing tomatoes is carried out three times:

  1. 14 days after transplanting seedlings into the ground.
  2. At the beginning of flowering.
  3. When the fruits begin to be massively tied.

And also in cases of detecting symptoms, which indicate a lack of trace elements, additional nutrition is necessary. In tomatoes with a deficiency of phosphates observed:

  • change in pigmentation of the leaves, painted in dark green with a blue tint;
  • the appearance of yellowish-rust spots on the stems;
  • the inside of the leaf changes color, and is close to purple.

Such signs can also appear at the time of a sharp cooling, or during the process of hardening seedlings, but with a sufficient amount of phosphorus, the color will restore with an increase in temperature. If, after stabilization of weather conditions, changes in the color of the leaves did not occur, this is a clear symptom of a lack of trace elements. Once the lack of phosphorus is confirmed, you need to feed the tomatoes with superphosphate to avoid stunting and development.

Dosage and administration

Depending on the time at which they are spent, there are different ways of feeding tomatoes with superphosphate. Technology and dosing also differ. For top dressing of tomatoes, the drug is applied in a dry form, sealed in the ground during autumn or spring digging, added to the ground for sowing seeds for seedlings. Sprouted seedlings and adult bushes are poured in dissolved form, and also used for spraying plants.

Dry application to the soil

Autumn fertilizer beds for tomatoes are produced for general enrichment of the soil with macro- and microelements, which will ensure the normal development of the crop in the new season. Fertilize during digging the beds. Superphosphate is used as follows: per 1 sq. Km. m. use 50 g of fertilizer, in the case of depleted soil, the dose is doubled. It is buried in the soil no deeper than the location of the roots of tomatoes in the future, and this is approximately 30-40 cm. In this way, it is enough to fertilize the plants every 5-6 years.

Phosphate fertilizers are used during seedling cultivation. Add in the preparation of the substrate. 180 g of superphosphate and 80 g of potassium are added to 25 kg of vegetable land. Such an enriched mixture will be the basis for the growth of strong and healthy plants.

Often, gardeners begin to fertilize the garden in the spring, before planting grown seedlings. Use the method of continuous dispersion along the beds and incorporation into the soil, as in autumn. The norm for continuous application of 30-40 g per 1 sq. M. And also contribute directly to the hole for planting a bush. For one bush, 5 g will be enough. In the spring, they mainly use granular or double, it dissolves better and the bush can get the necessary substances faster. The use of phosphate fertilizer mixed with ash in a ratio of 2: 1 has proven itself well.

Watering and spraying

Phosphates have poor water solubility. To feed tomatoes with superphosphate for the main feeding of seedlings and growing plants or when a deficiency of trace elements is detected, an extract is used.

Feeding of young tomato seedlings is carried out two weeks after the dive and use the solution. 15 g of fertilizer and 30 g of Foskamide are dissolved in 10 l of hot water, stirred well and allowed to cool. The resulting solution is watered or sprayed with seedlings. This amount is enough to feed 50 plants.

To prepare the hood, the granular preparation (400 g) is poured with hot water (3 l) and left for 24 hours. Sometimes mixed. The finished solution is diluted with pure water in a ratio of 150 ml of extract to one bucket of water. You can enrich the phosphate solution with nitrogen by adding 20 g of ash to it. Pour the tomatoes under the root.

They also fertilize tomatoes by spraying them with superphosphate in dissolved form. For such purposes, the hood is prepared at a lower concentration. Dissolve 1 tbsp. l superphosphate in 1 liter of hot water. The concentrate is mixed with 10 l of water.


Tomatoes, like all vegetables, for a full growth and development require a balanced complex of nutrients. The proper use of chemical mixtures provides trace elements that tomatoes need. Applied in sufficient amounts of fertilizer on time will ensure a quality crop of delicious tomatoes.


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