Everyone's favorite vegetable culture - cucumbers - is thermophilic. Perhaps maintaining the correct temperature regime is the first of the conditions necessary to obtain a generous harvest.

It would seem that it is warm in summer, and cucumbers should grow by themselves, but not everything is so simple! A lot of nuances affect the germination of seeds, how they will sprout, the formation of seedlings, flowering and fruiting. Much depends on the illumination of the plants. Growing in a greenhouse, open field or at home (windowsill, balcony, loggia) - three different ways to get a crop in completely different conditions.

At what temperature do cucumbers grow

In summer, the optimal temperature regime in the greenhouse in the daytime is from 23 to 30 degrees. In the absence of the sun, the temperature can drop to plus 21-22 degrees. At night it is lower, approximately plus 18-20 degrees.

Cucumbers growing in a greenhouse

The night temperature for cucumbers is also very important, since at this time the leaves are transferred to the fruits of substances synthesized in the light.

Fact! The higher the night temperature, the more actively the cucumbers ripen.

However, a moderate temperature is also necessary for the plant, because it promotes the growth of roots and the creation of new shoots. The branched root system is the key to the fertility of the bush, and the formation of shoots is the extension of the period of its fruiting. On too hot nights, the cucumbers will fill up quickly, but the harvest will only be plentiful for a short period.

In the event that a low temperature level remains for a long time at night, this will lead to a growth retardation and a decrease in the number of fruits. Especially in early summer, the weather is surprising. The difference between day and night temperatures is great. What temperature can the cucumber seedlings withstand:

  • +5 degrees - death to the plant, such a low rate it will not withstand even one day. In the morning, the leaves will wither and irreversible wilting will begin;
  • when the temperature drops to +8 degrees, the cucumber will withstand two days;
  • the normal indicator for growth is +15 degrees.

What to do to save the future harvest

Doors and vents can be used to adjust the climate in the greenhouse.

The gardener has some ways to regulate the climate in the greenhouse. First of all, these are doors and vents.

Tomato greenhouse temperature

In the heat, cucumbers require ventilation. This condition is necessary for healthy growth, prevention of fungal diseases. Opening the doors quickly lowers the temperature, but we must not forget that the draft will have a bad effect on the seedlings. This means that it is impractical to open doors on both sides of the greenhouse at the same time.

An open window, although it gives access to a small amount of air, is able to maintain a constant temperature, as well as reduce humidity.

Advice! On moderately warm nights, the vents are left open.

It is possible to save the future harvest during a period of sudden cold snap by covering the seedlings with foil. The method is effective, convenient at the beginning of growth, when the bushes have not yet been tied.

A fan can make it easier for seedlings to survive at very high temperatures.

Conditions in the tomato greenhouse

Forming cucumbers in the greenhouse

The temperature in the greenhouse for cucumbers and tomatoes is very similar. Like cucumbers, tomatoes are a thermophilic culture, requiring the creation of a mild climate close to the Mediterranean.

The first condition is warmed up soil before planting seedlings in the greenhouse. Not lower than +15! Moreover, you should ask about the weather forecast in advance. It is better to keep the tomatoes in the room for a couple of days than doom them to extinction in cold conditions.

It is important that the soil is warmed up

After 8-10 days the tomatoes will be much better if the temperature rises to 20-25 degrees. The greens will get stronger and look healthy. But there is also danger in the rise in temperature. At this initial stage, it must be lowered again in order to prevent a strong pulling of the bush, since all the strength will go to the leaves, and it is important to strengthen and develop the roots.

Like cucumbers, tomatoes will not withstand a cold snap up to +5 degrees, a mark near zero will cause the death of the plant immediately.

Important! The night temperature for tomatoes is about 18 degrees, the daytime is more than 20.

Experienced gardeners know that a lot depends on the selected tomato variety. There are hybrids that are not going to die in a short-term cold snap, even down to -3 degrees!

Daytime and nighttime temperature regulation in a tomato greenhouse is no different from caring for cucumbers in a greenhouse. But these two cultures should not live in one place.

Conditions in a polycarbonate greenhouse for cucumbers

Diseases of cucumbers in the greenhouse

Almost everywhere, in order to get a consistently high yield of this crop, it has to be planted in protected ground, and polycarbonate is a reliable refuge for thermophilic cucumbers.

Material pluses:

  • transparency (up to 85%), enough light penetrates inside for growth;
  • strength and durability of the material (neither a layer of snow nor hail is terrible);
  • the ability to keep warm inside for a long time.

How to create a microclimate in a greenhouse

A comfortable climate for cucumber is one of the fundamental conditions for successful cultivation. Temperature regime, humidity of air and soil - these are its components. The microclimate should not be constant, it should undergo changes depending on the growth phase. In addition, it changes during the day (morning - day - night).

How to create the right microclimate with your own hands:

  • bioheating is a reliable temperature regulator in the greenhouse, you don't have to worry about the temperature state of the soil. Biofuels will not let you drop to dangerous numbers;
  • air humidity is maintained by correct irrigation, spraying water, open containers filled with water;
  • ventilation (airing) - saves from many troubles (heat, development of diseases, excessive humidity, attracting insects for pollination. However, you should not overdo it with ventilation either, since all plants need carbon dioxide for development, so keeping the door constantly open is also harmful.

Attention! Increased humidity in the greenhouse is a threat at night due to lower temperatures. At low thermometer readings, moisture will cause powdery mildew.

"Water treatments" such as spraying should be done when the night is sure to come.

Maintaining the climate in a greenhouse is a man-made process that requires constant attention.

Open field cucumbers

In the open air, in unprotected ground, delicious cucumbers grow! The best place in the garden is usually allocated precisely for the garden with them - sunny, protected from the winds, but the joy of collecting ripe fruits comes after considerable work in the struggle to preserve the life of each bush.

Open field cucumbers

In addition to arranging a bed with fertile soil, the choice of a variety for open ground and the climatic conditions of the region is also important.

It is necessary to plant cucumbers quite late, when frosts stop and the soil warms up to 13-14 degrees. However, covering material should always be at hand if the night turns out to be cold.

The minimum temperature for growing cucumbers is plus 15 degrees. The temperature at the border of 13-14 degrees stops the yield.

At what temperature do the seedlings of cucumbers and tomatoes die?

Cucumbers

Growth will stop when the temperature drops to +14 degrees, with an indicator of up to 10 degrees Celsius, the cucumber will get sick and subsequently die.

The temperature must not drop below +14

Tomatoes

They are able to withstand a decrease in the night temperature to +12 degrees. At 10 degrees Celsius, they will stop growing. At +5 degrees, the seedlings will die.

The optimum temperature for planting cucumbers in open ground

Most often, cucumbers are planted in open ground by seeds. Grown in natural conditions, they undergo hardening already at the initial stage, but this does not negate the need for the correct choice of the variety. The gardener must choose it taking into account the climatic conditions of the growing area.

Advice! It is best to sow seeds on a sunny day, when the ground in the garden is warmed up to +15 degrees.

The soil at the time of sowing is prepared - manured, dug up, has a low acidity. A large amount of organic matter generates a lot of heat, which prevents the seeds from freezing. But this is not enough to preserve crops, since cucumbers can withstand their temperature regime.

The night temperature for cucumbers in the open field should be at least +13 degrees, if it drops below, the cucumbers will not grow. To avoid trouble during the cold season, they arrange a greenhouse - they put low supports on which they stretch the film. This can only be stopped with the establishment of stable warm weather.

The critical temperature level for cucumbers is +10 degrees or less. The plant will simply freeze, it will no longer be saved.

Attention! With frequent frosts and sudden changes, it is not necessary to plant this crop in open ground! The same is true for tomatoes.

The ideal difference between night and day hours is 7-8 degrees. With a daytime 28 degrees of heat at night, the desired level will be 20-21 degrees. These values ​​are most conveniently maintained in a greenhouse.

Danger of high temperatures

On especially hot days, the sun heats up, the temperature rises sharply in the greenhouse. When the mercury column exceeds 40 degrees, this is no less evil than low rates. The plant is rapidly aging, the ovaries fall off. This situation will be corrected only by spraying water and containers with it in the aisles of the greenhouse. In the late afternoon, good ventilation is needed!

By following these rules, you can almost guaranteed to get a good harvest.