What is the best humidity for vegetables in a greenhouse? What is the humidity of the general greenh

For different crops, the humidity required for the same crop in different growth periods will be different, and control measures should be mastered. Humidity is one of the cultivation conditions required to ensure the growth of greenhouse crops in winter, and the following describes several ways to adjust the humidity of greenhouses:

1. Change the temperature: according to the characteristics of the humidity change in the greenhouse, if you need to increase or decrease the relative humidity.

, the temperature in the shed can be appropriately changed without affecting the humidity requirements. The method is: the humidity in the shed is 100%, the temperature of the shed is 5, and the humidity drops by about 5% for every 1 increase in air temperature; At 5 10, for every 1 increase, the humidity will drop by 3%-4%; When the greenhouse temperature is increased to 20, the humidity is 70%; When the greenhouse temperature is 30, the humidity is 40%.

Conversely, the relative humidity can rise to 85% when the temperature drops to 18 and almost 100% when the temperature drops to 16. Therefore, the method of heating and cooling can be used to control the humidity in the shed.

2. Ventilation: ventilation is the simplest method of reducing humidity in greenhouses, generally after each irrigation, without affecting the temperature, the ventilation should be increased, and the dry air from the outside world should be replaced to reduce the relative humidity of the air in the shed. Ventilation cannot be done blindly, and the amount of air exchange must be determined according to the need.

Crops require air humidity.

It is lower, and the soil moisture should be appropriately high, so it is necessary to open the skylight.

It is necessary to analyze and grasp the length of time to open the ground window, open the big or small, and open the time.

3. Field management: before sowing or after planting, it is necessary to fully water, and after the water seeps down, you can use the method of cultivating and covering the soil to maintain a suitable soil temperature and reduce the relative humidity of the air. If you want the humidity of the air to change less, and to meet the needs of vegetables for soil moisture, you can take ditching, hole watering or drip irrigation to avoid flood irrigation.

Methods such as covering soil after irrigation or laying grass on the ground, and covering with plastic film can also reduce water evaporation and maintain a certain humidity of the soil. When the air temperature is low and the humidity needs to be increased as soon as possible, water or spray can be sprayed directly on the ground.

The humidity of greenhouse vegetables is generally between 60 and 90%, and the degree of humidity requirements for different types of vegetables is also different, so humidity management should be carried out according to the types of vegetables.

The higher the temperature, the better, at least 15 degrees: the lower the humidity, the better, and it is best to control it at around 75%.

The requirements of temperature and humidity in greenhouses vary according to different varieties.

All kinds of vegetables are different, but they all have to prevent high humidity from inducing a variety of fungal rot diseases.

What is the best humidity for the vegetables in your greenhouse? I think the vegetables in the greenhouse are in the 10s, so it's easy not to be too tall and too high. It's not good if the vegetables are too hot, so I think 10 degrees or more 20 degrees is just right.

Generally 25-35 during the day and 7-15 at nightHumidity can reach 100% at night and 70-90% during the dayHumidity requirements also vary depending on the vegetables grown.

No matter what is planted in the greenhouse, the temperature should not exceed about 30 degrees, and the humidity should not exceed about 70%.

The humidity of vegetables in the greenhouse is 50-605, and the temperature is 20-24Such an environment is optimal.

Generally, the humidity of the greenhouse is 50%-90%, but if there is fogging, it is necessary to ventilate or heat to change the humidity.

In order to prevent the humidity in the greenhouse from being too high, the following eight methods can be used:

Cover with non-drip film: The non-drip film can overcome the disadvantages of a large number of water droplets attached to the inside of the film, and improve the light transmittance of the agricultural film, which is 10% 15% higher than that of the general agricultural film, which is conducive to temperature and humidity reduction.

Mulching: The use of mulching can greatly reduce the evaporation of soil moisture, especially the whole shed mulching, which is an important measure to reduce the humidity in the shed.

Drip irrigation: Drip irrigation combines the common advantages of mulch mulching and drip irrigation, and is the most effective measure to reduce humidity in the shed. The method is to put a plastic drip irrigation pipe on the furrow ** and then cover it with mulch.

Reasonable watering: watering is the main factor leading to the increase of humidity in the shed, winter and spring production can choose sunny watering, watering to strictly control the amount of watering, to prevent the humidity in the shed from being too high. Proper ventilation after each watering and timely loosening of the soil can reduce soil moisture and air humidity.

Ventilation and dehumidification: Ventilation is the easiest way to reduce the humidity of the air in the greenhouse. Ventilation must be carried out at high temperatures, otherwise it will cause the shed temperature to drop. If the humidity drops too quickly during ventilation, the vent should be closed in time to prevent the sudden drop in temperature from causing harm to the crops.

Increase the light transmittance: Increasing the light transmittance can improve the humidity of the shed, and the air humidity will decrease after the humidity of the shed increases. In general, air humidity decreases as the temperature increases.

Hanging reflective curtains: Holding reflective curtains in the shed can not only increase the light intensity, but also increase the ground temperature and temperature. Because the relative humidity of the air decreases with the rise of temperature, the hanging reflective curtain in the shed also has the effect of reducing the air humidity to a certain extent.

Use dust method or smoke method to use drugs: the air humidity in the shed is inherently large, and the use of conventional spray method will increase the humidity in the greenhouse, which is not conducive to the prevention and control of diseases. The use of dust method or smoke method can avoid increasing air humidity due to spray and improve the prevention and control effect.

Different types of vegetables require different humidity. For example, cucumbers and loofahs need high temperature and high humidity, and the humidity can reach 90%. Low-humidity crops such as tomatoes may have a humidity of up to 80% and frequent diseases.

For details, you can consult the Shouguang Agronomic Technician Association or log on to the China Agricultural Technician Information Network.

Generally, the relative humidity of the air in the shed can reach at least 50% or 60% during the day. Or even more than 70%. It can reach 90% at night or on rainy days.

Greenhouse crops grow under relatively closed conditions, and most of the water produced by ground evaporation and crop transpiration stays in the shed, resulting in higher air humidity in the shed than in the open field. Excessive humidity in the shed can easily cause bacterial horn spot, cotton blight, downy mildew and other diseases. Therefore, scientific control of humidity in the shed is particularly important for the healthy growth of crops.

Generally 25-35 during the day and 7-15 at nightHumidity can reach 100% at night and 70-90% during the dayThe temperature and humidity requirements are also different depending on the vegetables grown.

When the melon vine grows to 2 meters, remove the main vine growth point to grow 3-4 branches. In order to create a good light transmission and ventilation conditions for the pumpkin, it is necessary to build a scaffolding, and the specific method is: when the branch vine grows to 2 meters, the vine is led to the scaffolding, and the vine is not broken.

The pumpkin after the scaffolding will reduce pests and diseases, so that the melon sitting rate will be greatly improved.

When growing vegetables in this greenhouse, the temperature is controlled at about 25 and the humidity is 50%, which is the most suitable environment.

The suitable temperature should be between 50 and 55. Humidity can be determined based on the acidity and alkalinity of the soil.

The greenhouse is a high humidity environment. The relative humidity of the air in the shed can generally reach 50% to 60% during the day, and it is often around 90% or even 100% at night.

The horizontal distribution of relative humidity in the shed is 10% higher in the periphery than in the ** area.

Ventilation and irrigation have a great influence on the relative humidity of the air in the shed, with the former reducing humidity and the latter increasing humidity.

The following measures can be taken to reduce the humidity in the greenhouse:

1. Ventilation excludes moisture and replaces it with dry air outside, which is the easiest way to reduce humidity. However, it is necessary to prevent the temperature in the greenhouse from dropping too low due to ventilation.

2. Cover with non-drip film The non-drip film can overcome the disadvantages of a large number of water droplets attached to the membrane, significantly reduce the humidity, and have good light transmittance, which is conducive to the heating and humidity reduction in the greenhouse.

3. Mulch film mulching can greatly reduce the evaporation of ground moisture, and can reduce the number of irrigation, thereby reducing the air humidity in the greenhouse.

Fourth, the use of drip irrigation or infiltration irrigation drip irrigation, infiltration irrigation coated with water-saving, labor-saving, fertilizer-saving, drug-saving, to prevent soil compaction, more importantly, can effectively reduce the impact of humidity caused by watering.

5. Drip irrigation under filmDrip irrigation combines the common advantages of plastic film covering and drip irrigation, and is an effective measure to reduce the humidity in the greenhouse. The method is to raise high ridges on the ground, and then put drip irrigation pipes on the ridges**, and then cover them with plastic film.

Sixth, dust method and smoke method must be applied in the greenhouse, if the conventional spray method is used, it will increase the humidity in the greenhouse, which is not conducive to the prevention and control of diseases. The use of dust method and smoke method can overcome the above drawbacks.

Seventh, high temperature and humidity in the morning to the greenhouse after the unwrapping or quilt, generally do not let the wind, without harming the greenhouse crops on the premise, should try to increase the temperature (such as cucumbers, can let the temperature rise to 32). As the temperature rises, the humidity gradually decreases. When the temperature rises to the maximum value of the suitable temperature required for the cultivated crop, the air begins to be released.

8. When the temperature in the greenhouse is high on a sunny day, the surface of the shallow hoe is used to speed up the evaporation of topsoil moisture to reduce the humidity of the greenhouse.

In order to ensure the temperature of the shed, usually the shed film is closed, so that it cannot breathe, and it is easy to affect the normal water circulation of plants, which will increase pests and diseases, and easily cause flowers and fruits to fall off. So, how can you reduce the humidity in your shed?

1. Shed film. There are many varieties of shed film, and when buying, you should not only look at the cheapness, but also look at its function. For example, some canopy films are very good, water does not collect on them, and the light transmittance is particularly good, so it is actually very cost-effective to spend more money in this area. In addition, there is a special medicine that can be used to improve the accumulation of moisture in the greenhouse film, and the water sprayed on the greenhouse film will run away and will not accumulate on the film, which is really convenient.

2. Mulch. In winter, crops are usually covered with mulch, which protects the soil temperature and allows the crops to grow better. In fact, plastic films also have a water-retaining function, which can reduce water evaporation, which reduces humidity in the greenhouse.

3. Ridge formation. Generally, when we plant, we will ridge and plant, and if we make ridges, the benefits are really very many. First of all, it is easy to manage, and in addition, it can also allow water to drain away, so it is not easy to accumulate water. In addition, there will be more light after ridge formation, so that the temperature of the soil will be higher and the water will evaporate faster.

4. Watering. There is also a very important reason for excessive humidity in the greenhouse, that is, unreasonable watering, which is the main reason for the excessive humidity in the greenhouse. Therefore, we must pay attention to watering rationally so that the humidity can be better controlled, and when the weather is fine, it is possible to choose watering and not too much at a time.

If you water too much, the humidity will be high. It would be even better if it could be watered with drip irrigation. Water is not wasted, in other words, it does not cause excessive humidity. Of course, the most important thing is to always keep an eye on the wind.

What is the humidity of the vegetable greenhouse?

The use of greenhouses to grow vegetables, different varieties have different requirements for temperature, do a good job in variety matching and temperature regulation management is the key to planting greenhouses. x0d x0a I. Chili peppers. Like high temperature, the temperature of germination is 30-45, the suitable temperature for growth is 26-30 during the day, 18-22 at night, the temperature below 15, the seed can not germinate, and the flowering can not be fertilized.

In cultivation, the greenhouse temperature must be kept at 20-25, and if it is lower than 18, it will not grow normally. x0d x0a two, tomatoes. It likes high temperatures, and 25-30 is the ideal germination temperature.

The suitable temperature for growth is 27 during the day and 17 at night. The lower limit of the ground temperature during the cultivation period is 10, the minimum temperature according to the growth is 5, the most suitable temperature is 28, and the maximum shall not exceed 38. x0d x0a 3. Celery.

Celery likes to be cold, and the required growing temperature is 20-22 during the day, 15-18 at night, and the temperature difference between day and night is 4-5. The ground temperature is required to be 18-20, and the minimum should not be less than 3-6. The late stage is not less than 6-8, otherwise it will not be able to grow and develop normally.

x0d x0a Fourth, cucumbers. The requirements for temperature are stricter, the suitable temperature is 24-26 during the day, 14-15 at night, the lower limit of low temperature is 10-12, the temperature stops growing below 10, and the root activity above 30 is weak and the leaves are atrophied. The seedling growth period should not be lower than 18, and the minimum temperature is 20-23.