Rules for feeding tomatoes in a greenhouse

Rules for feeding tomatoes in a greenhouse

Even if you plant tomato seedlings in a fairly fertile soil, located in a polycarbonate greenhouse, it’s unlikely to grow a good and rich crop without additional baits will succeed. Consider when and how to feed tomatoes in a greenhouse so that they fully develop and bear fruit on time.

  1. Preparing for landing
  2. Soil <
  3. Tomato seedlings
  4. Seed
  5. Nutrition after planting
  6. Nitrofoska
  7. Manganese <
  8. Bait during flowering
  9. Sudarushka <
  10. Self-preparation of fertilizers
  11. Foliar nutrition
  12. Nutrition during fruiting
  13. Superphosphate <
  14. Boron and iodine
  15. Some recommendations
  16. Frequency of baits
  17. For strong seedlings
  18. For intensive growth

Правила подкормки помидоров в теплице

Rules for feeding tomatoes in the greenhouse

Preparing for planting

Recommended for planting the grown seedlings in the open ground in greenhouses digging time to prepare the soil and process the seedlings themselves. The seed material for growing tomatoes in a greenhouse is fed.


Land in a greenhouse for subsequent planting of tomatoes is prepared in the fall or spring. To fertilize the land and get a rich harvest, turf and peat are introduced into the soil in equal proportions (usually 1 bucket per 1 sq. M of sown area).Organics are added to them: 0.5 l of ash fertilizer, a 10-liter bucket of compost or humus, as well as 1 tsp each. urea per 1 square. m beds.

Immediately before planting tomato seedlings or seeds, the soil is fertilized with potassium permanganate in a proportion of 1 g per 10-liter volume of water heated to a temperature of 60-80 ° C.

Tomato seedlings

Before planting tomato seedlings in a greenhouse, it is fed with yeast. For feeding the sprouts, 1 sachet of dry yeast diluted in a glass of warm water with the addition of 2 tsp is enough. granulated sugar. Infused for 2 hours, a 1.5-liter mixture with yeast increases with water to a 10-liter volume. Tomato seedlings are watered with such yeast fertilizer before planting in the greenhouse.


Dense seeds show better germination, therefore they are sorted based on this characteristic. To do this, the seeds are immersed in an aqueous solution with sodium chloride concentration of 3-5% or potassium nitrate with a concentration of 50 g per 1 liter. For planting in the greenhouse, only seeds sank to the bottom of the container are used.

A seed treatment preparation is selected, depending on the purpose:

  • to create resistance of the vegetable crop to various diseases and infections, seed material fed with potassium permanganate at the rate of 1 g per glass of water,
  • to accelerate the germination of the seed material is soaked in wood ash (1 tbsp.per liter) or in a self-prepared solution with boric acid (0.02%), ammonium (0.01%), manganese sulfate (0.05%), copper (0.05%), potassium (0.025%). In both cases, to activate the process of seed germination, they are placed in the bait for 0.5 days at a temperature of at least 20 ° C.

After bait, the tomato seeds are hardened, leaving for 12-24 hours in the refrigerator a chamber with a temperature of 1-2 ° C. Hardening the seed material will allow the vegetable crop to adapt faster after planting and survive in cold climates, especially in the northern regions.

Food after planting

Fertilizing tomatoes in the greenhouse after planting seedlings or seed material is carried out several days after planting. When growing tomatoes from seeds, the initial feeding of tomatoes in the greenhouse is made 2 weeks after the appearance of sprouts. This usually happens in late May or early June.

Planted in a greenhouse vegetable crop primarily requires nitrogen, phosphorus and potassium fertilizers.

Another answer the question of what to feed tomatoes in the greenhouse after planting is nitrophoska and manganese.

In greenhouse conditions, the humidity indicators are much higher than in the open air, because the absorption of nutrient fertilizers by the plant is more active and in full.That’s why you need to feed tomatoes in the greenhouse for the first time by lowering the liquid concentration compared to that used for vegetables grown in the open.


Для первоначальной подкормки подойдет раствор нитрофоски с коровяком

For the initial feeding, a solution of nitrophoska with mullein

Fertilizing tomatoes in a greenhouse nitrophosic produced as follows: 1 tbsp. l mixed with 0.5 liters of mullein per 10 liter volume of water. The consumption rate for root feeding of tomatoes in the greenhouse is 1 liter for each tomato bush.


It is recommended to feed tomato seedlings in the greenhouse with potassium permanganate no more than once every 7 days. For this procedure, a slightly concentrated solution is made.

Bait during flowering

Be sure to feed the tomatoes in the greenhouse at the flowering stage. At the same time, gardeners use both ready-made nutrient complexes, micronutrient fertilizers and plant food for their plant care.


The universal fertilizer complex Sudarushka has established itself as a good tool for basal bait during the appearance of the first flowers.The composition of the finished fertilizer without chlorine contains all the main components that ensure the full development of the culture:

  • 13% nitrogen,
  • 8% phosphorus and potassium,
  • 0.15% zinc,
  • 2% manganese,
  • 0.1% copper,
  • 1.5% boron,
  • 0.04% cobalt,
  • 0.04% molybdenum.

For a working solution, 1 teaspoon is enough. finished fertilizer per 10 liter volume of water. The consumption rate of the finished composition is 0.5 l for each tomato bush.

Self-preparation of fertilizers

You can prepare fertilizer compositions for root bait of tomatoes at the flowering stage yourself. To do this, just mix the source components of the nutrients necessary for tomatoes:

  • 1 liter of potassium sulfate,
  • 0.5 liter of mullein,
  • 10 liter of liquid .

The fertilizer consumption rate is one liter per bush.

Foliar nutrition

Foliar feeding of tomatoes in the greenhouse includes and fertilizers with wood ash or magnesium.

Ash fertilizers

During flowering and the formation of ovaries, ash spray is a source of nutrients obtained through foliage. Tomato leaves are sprayed in the evening. The working solution for foliar bait is made of 2 glasses of ash, filled with the same amount of heated water.The resulting mixture was incubated for 2 days, then filtered, the volume was adjusted with water to 10 l, and then tomato tops were sprayed.

Magnesium sulfate

Foliar feeding of tomatoes with magnesium sulfate affects the quality and active formation of ovaries. 15 g of fertilizer with magnesium are diluted in a 10-liter volume of water. Each bush should have 1.5 liters of solution.

Nutrition during fruiting

Во время плодоношения используют только прикорневую подкормку

During fruiting, only basal top dressing

is used for fruiting at the fruiting stage for the last time. At this time, the plant needs iodine, potassium, boron, manganese. During the appearance of fruits on tomato bushes, only root bait is used, foliar nutrition is not used so that the fruits do not crack. . 2 tbsp. l superphosphate is mixed with 1 tbsp. l potassium humate and diluted with 10 l of water. The feeding rate is per liter of ready-made fertilizer for each tomato bush.

Boron and iodine

Boric acid (10 g) mixed allows to fill the deficiency of the mineral elements required at the fruiting stage with iodine (10 ml) and ash (1.5 l). An aqueous solution is made with these components, diluting them in a 10-liter volume of liquid.The rate of consumption of the finished fertilizer is 1 liter per tomato bush.

Some recommendations

Bait frequency

Not a single summer resident will tell you how to feed tomatoes in the greenhouse and when to do it right. The timing is influenced by the tomato variety, climate and health status of the crop.

Typically, the frequency of bait is 3-4 times for the entire gardening period, but can be increased if, with proper care, the appearance of the plants indicates a disadvantage mineral nutrition. In these cases, they start feeding the problematic vegetable crop by fertilizing at intervals of 1.5-2 weeks, alternating root and foliar bait.

For strong seedlings

Often tomato seedlings try to stretch in height, as a result of which the stem becomes thinner. Make the seedlings stronger helps bait tomatoes in the greenhouse, held after a dive. To feed the tomatoes, superphosphate (20 g), ammonium nitrate (30 g), potassium sulfate (15 g), an ash extract (100 g) and 10 l of water are mixed. Tomatoes are recommended to be fed with this compound 2 weeks after diving and repeated at the same interval.

For intensive growth

If tomatoes grow poorly and slowly in the greenhouse, they are fed with humate sodium. Root bait allows you to introduce a lack of sodium, as well as get in return the activation of growth of tomato bushes.

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Anna Evans

Author ✓ Farmer

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