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Why the leaves of tomato seedlings turn yellow and what to do


Yellowed leaves are the first signs that plants are not comfortable. Yellow leaves of seedlings may indicate the appearance of the disease. The reasons why tomato seedlings begin to turn yellow may be several.

Yellowing of tomato seedlings is quite common. Strong seedlings suddenly begin to turn yellow, wither, spots appear on the leaves, the upper tips begin to curl. To get rid of these problems and help the plant to recover, you should understand the cause of the appearance of a bad disease and take all necessary measures to prevent it.

Causes of yellowing and why tomato seedlings grow poorly

The causes of yellowing are many. In order to take action, you first need to figure out why the leaves began to turn yellow.

The most common mistakes in the care and landing

Yellowed leaves signal the occurrence of problems related with the wrong care.

The main reasons are:

  • Lack of sunlight and excess moisture
  • Often seeded seedlings
  • Lack of trace elements
  • High soil acidity
  • Shortage after landing
Too tight fit may cause a lack of light.
Often the seedlings in the northern and middle regions suffer from a lack of light. Abundant watering exacerbates the situation, and the leaves begin to turn yellow.

Often seeded seedlings also cause a lack of light. It grows, grows stronger, begins to close the sunlight foliage.

Micronutrient deficiencies leads to yellowing. Trace elements resulting in yellowing:

  • Nitrogen
  • Potassium
  • Magnesium
  • Zinc
  • Iron
  • Manganese

If land too salty, the leaves will also begin to turn yellow. Salted soil can be identified by white or yellowish spots on the surface of the ground - on the fly.

Incorrect packaging - the cause of yellowing. If the container is too small, the growing roots become cramped, the seedlings begin to ache, the leaves turn yellow.

If the roots of the seedlings closely - tomato can get sick

What to do if the leaves of tomato seedlings turn yellow

Having dealt with the causes of yellowing, consider ways to prevent them.

With a lack of sunlight seedlings put on the sunny side windows on the window sills. For additional lighting use lamps that extend the daylight hours at home for 5 hours.

Seedlings need to be watered properly.

Irregular watering also leads to yellowing. With a lack or excess of moisture, the seedling material turns yellow. It is necessary to water rarely, but plentifully.

If planting is too frequent, shading occurs, transplanting in separate pots will help fix it.

    • If there is not enough nitrogen, the leaves turn pale, fall off, the new ones grow smaller. Fertilizing with nitrogen will eliminate nitrogen deficiency.
    • If new leaves become curly, and those that are older, turn yellow and fall off, it is necessary to water or feed potassium nitrate.
    • The leaves turn yellow between the veins - a lack of magnesium. Spraying with magnesium nitrate will correct the problem.

The appearance of brown spots indicates a shortage of zinc. New are stained, dry, fall off. A solution of zinc sulfate will correct the situation.

  • If they acquire a light green or even white color, the seedlings do not have enough iron. Requires foliar dressing.
    The leaflet lacks manganese, it begins to turn yellow at the base, stained staggered. In this case, you can fertilize and spray the plant with a solution of potassium permanganate.
If the leaves turn yellow between the veins - not enough magnesium

The ground can be salted when irrigated with hard water or an excess of fertilizer. In this case, remove the earth from the surface of 3 cm and watered with soft or rain water. You can feed only in a few weeks.

The seedlings which have become yellow due to the lack of space for the roots can be saved by spreading it into deeper and more spacious containers.


The cause of the yellow leaves of tomatoes can be the occurrence of diseases.

The appearance of yellow spots provokes a fungal disease called fusarium. The leaves in this disease not only turn yellow, but also wither. Saplings are sprayed with Fitosporin 2-3 times, after 1-2 weeks, the procedure is repeated.

Often tomato seedlings are affected. blackleg. It occurs when excessive watering. Roots become thin and black. To prevent the appearance of black legs should observe the temperature and proper watering.

A common tomato disease that also affects eggplants, potatoes, and peppers is called Phytophthora. Phytophthora occurs when excessive moisture and low temperatures. Brown spots are formed. Late blight develops very quickly, it is necessary to take urgent measures.

To combat the blight will help the salt solution. To do this, dissolve 0.5 tablespoons of salt in 5 liters of water and spray the seedlings.

Tomato seedling struck black leg

Why leaves turn yellow

Understanding the reasons is not so difficult if you pay attention exactly which leaves of the seedlings turned yellow. There are several reasons for the yellowness of the lower leaves:

  • Over-watering
  • Lack of light
  • Excess fertilizer

Cotyledon leaves may turn yellow due to abundant watering. The roots of the plant begin to choke in the water, and they begin to turn yellow.

Tops tomato turns yellow with a lack of phosphorus.

There are other factors that can lead to yellowing of the leaves.

After transplant

Seedlings may turn yellow after transplantation. The fact is that the plant needs time to acclimatize to a new place.

In this case, pritenite it for a couple of days from the sun.

On the windowsill

Sunburn seedling tomato

If the seedlings are on the windowsill the reason may be sunburn. In this case, it is necessary to protect it from direct sunlight.

After picking

Leaves may turn yellow after picking. Some gardeners when picking too much damage to the roots seedlings, which leads to stress.

After landing in the ground

Planting tomato seedlings is necessary in the soil containing a sufficient amount of copper necessary for the normal growth of tomatoes. With a lack of copper, it begins to turn yellow.

With copper deficiencies in the soil, seedlings can also turn yellow.

In the open ground

In open ground, seedlings may begin to turn yellow due to the lack of trace elements in the soil.

Yellowing may provoke weather. Too cold weather disrupts plant metabolism. In hot weather and sparse watering, tomatoes can get burned.

What is missing tomato seedlings

For seedling material you need to constantly monitor, even a slight change in the color of the plant signals a change or even the beginning of the disease.

Important to feed properly and in time. The first time it feeds when the first true leaf appears. The second time is 7-10 days after the picks.

How to feed

In time spent feeding seedlings is very important

The first feeding is done from copper solution. Top dressing is carried out after one true leaf appears. To do this, prepare a solution of copper at the rate of 1 tsp. copper on 1 l. water. Seedlings are poured over the prepared solution. Thus, the seedlings will be processed from the phytophthora.

For good growth, seedlings are needed nitrogen. The second dressing is done 7-10 days after the pick. Urea is used for feeding. 1 tbsp. l urea to 10 liters. water. Liberally water the seedlings with a solution.

Ignore even the slightest change is not worth it, because it says the wrong care, and can also cause diseases. With proper identification of the cause of yellowing, it is possible to prevent problems and grow strong, healthy seedlings.