1. Greenhouse location

It is very important to select the location of greenhouse. When selecting the location, we should try to choose the flat plot. The groundwater level should not be too high. We should avoid the mountains and buildings that block the light. For the users of planting and breeding, we can not build the greenhouse in the polluted places. In addition, the wind resistance of the selected greenhouse should be considered in areas with strong monsoon. In general, the wind resistance of greenhouse should be above grade 8.

2. Orientation of greenhouse

It is suggested to choose the north-south direction of the greenhouse, that is, the mountain wall of the greenhouse is on the north and south sides, which can make the crops in the greenhouse distribute uniform light. The light transmittance in the north-south direction was 5% - 7% more than that in the east-west direction, the light distribution was uniform, and the temperature change in the greenhouse during the day was gentle. Therefore, greenhouses tend to be north-south

3. Greenhouse steel

Hot dip galvanized steel pipe is commonly used in greenhouse steel. Hot dip galvanized steel pipe is firstly pickled. In order to remove iron oxide on the surface of steel pipe, after pickling, it is cleaned in the tank with ammonium chloride or zinc chloride solution or mixed solution of ammonium chloride and zinc chloride, and then sent into the hot dip tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion, long service life and strong corrosion resistance.

4. Greenhouse covering film

PE film and Po film are commonly used. The owner who has higher requirements for drip can choose Po film. The anti drip function of Po film is consistent with the life of the film. The anti dripping function of PE film is chemical additive, which will gradually weaken after one year. The owner can also choose the film with scattering or high transmittance according to the needs.

Ebb and flow system is a kind of bottom irrigation method designed for containers or matrix blocks such as flowerpots and trays, which is suitable for fruit and vegetable seedling and cultivation.

It is mainly composed of cultivation bed, nutrient solution circulation part (supply and return pipeline, nutrient solution storage pool, circulating water pump, disinfection equipment, etc.), control part and plant cultivation carrier (substrate block or cultivation container).

When the tidal irrigation system is running, the nutrient solution overflows from the water inlet of the cultivation bed (called “rising tide”). When the liquid level reaches a certain height, the nutrient solution infiltrates the substrate from the bottom of the container and is absorbed by the capillary action of the substrate for the cultivation crops to absorb and use. When the irrigation is completed, the nutrient solution is discharged from the backwater outlet of the cultivation bed (called “ebb tide”)

We recommend to use flat cultivation rather than A frame for NFT lettuce hydroponic in greenhouse. There are several reasons why more people choose flat cultivation:
1. The number (yield) of planting slots is actually similar. For example, for one span, you can put 48 cultivation pipes with A frame, 45 cultivation pipes with flat cultivation. Not much difference in quantity. But the price for A frame is much more expensive than flat cultivation.
2. The yield of flat cultivation is relatively stable, and the influence of light is relatively small. But for the A frame, If there is not enough light in the area, the lettuce on the lower level will not get enough light and will not grow well.
3. More convenient installation and lower transportation cost for NFT lettuce flat cultivation.

4. It is more convenient for growing and harvest with flat cultivation in the greenhouse.

1. Control and regulation of temperature in greenhouse

The control of temperature in greenhouse should follow the principle of "high in early stage, low in late stage". In the early stage, the temperature was controlled at about 30 ℃ in the daytime and about 15C at night; During budding stage and flowering stage, the temperature was controlled at 25C in daytime and 10 ℃ at night; During the fruiting period and harvest period, the temperature was controlled at about 23C in the daytime and 7C at night. If there is continuous haze in the middle, we should pay attention to the measures of artificial heating.

2. Humidity control in greenhouse

At noon, the greenhouse needs ventilation; In case of snowy weather, greenhouse ventilation can be adopted at noon to remove moisture, and the depth of shed should be kept below 80%.

3. Treatment of mulching film and gibberellin

The black film is suitable for covering, which can increase temperature and decrease humidity. A small amount of gibberellin can be applied when strawberry plants produce two new leaves and budding stage to prevent the plants from entering dormancy. Usage and dosage of gibberellin:

The concentration was 5 ~ 10mg / L, 5ml / plant.

4. Water and fertilizer management during plant growth

After the plant growth is stable, pay attention to keep the soil matrix moist, pay attention not to water. The plants in fruiting and flowering stages need more nutrients, so topdressing can be applied properly. The usage and dosage of topdressing: n, P, K compound fertilizer 10kg / hm2, 0.4kg/plant; The fertilizer can be dissolved in water for irrigation.

5. Summary

Based on the growth habits of strawberry, it is very suitable for overwintering cultivation in greenhouse, effectively avoid the phenomenon of low temperature dormancy, improve the production efficiency of strawberry in greenhouse, so as to meet the market demand.

Vegetables grown in thin-film greenhouses

are often misdiagnosed as diseases due to improper fertilization methods and neglect of ventilation, which causes excessive greenhouse toxic gases and harms vegetables, and they are often misdiagnosed as diseases, leading to insufficient or even no harvest.

1. Harm:
   
2. Nitrogen
   
   Due to excessive application of quick-acting chemical fertilizers such as urea and ermium sulfate, or improper fertilization methods, such as the application of unripe organic fertilizers, the decomposition of ammonia under high temperature conditions in the shed will damage the vegetables and cause the leaf edge tissue to appear watery. Spots, when severe, the whole leaves wilt and die. It is often misdiagnosed as frost-old disease or other diseases. Vegetables that are sensitive to ammonia include cucumber, tomato, and zucchini.
   
   
   

3. Nitrous acid gas
   

   Applying too much ammonium nitrogen fertilizer at one time will reduce the effect of certain bacteria and cause local acidity in the soil. When the PH value is less than 5, nitrous acid gas is produced, which can cause white spots on the vegetable leaves, and serious whole leaves become white and dead. It is often misdiagnosed as powdery mildew. Vegetables that are sensitive to nitrous gas include eggplant, cucumber, zucchini, and celery. , Pepper, etc.

   
   

4. Ethylene and chlorine
   
   If the quality of the agricultural film or mulch film is poor, or there is mulch film residue in the ground, it is exposed to the sun, and under the high temperature conditions inside the greenhouse, it is easy to volatilize and produce harmful gases such as ethylene and chlorine. When the concentration reaches a certain level, the vegetable leaf margins or veins will turn yellow, and then turn white. In severe cases, the whole plant will die. It is often misdiagnosed as bacterial keratoderma, which is particularly harmful to cucumbers. In addition, heating in winter is heating up, and if the fuel is not burned sufficiently, toxic gases will be generated, and if the ventilation is not timely, too much carbon dioxide will accumulate. Affect vegetable production.
   
   Two, prevention:
   
5. Fertilize reasonably.
   
   The organic fertilizer used in the greenhouse must be fermented and decomposed, the chemical fertilizer must be high-quality, and urea should be mixed with calcium superphosphate. The base fertilizer should be applied 20 cm deep, and the topdressing chemical fertilizer should be about 12 cm deep, and water in time after application.
   
6. Ventilation.
   
   In sunny and warm weather, ventilation and ventilation should be combined with temperature adjustment, and ventilation and ventilation should be properly conducted in rainy and snowy weather.
   
7. Use safe and non-toxic agricultural film and mulch to remove waste plastics and their residues in the greenhouse in time.
   
   
   

As an important element of crop growth, light has always been the focus of attention of growers when considering key elements such as yield and quality. Many discussions in the industry include how to maximize the use of natural light, how to work hard from the top of the greenhouse glass to make crops more efficient in light use, and whether there are better use and combination of curtains, etc., are all around this topic, all for the sake of Provide the best growing conditions for crops.

This article will explain from which angles in the greenhouse can be considered to optimize the lighting conditions to maximize the light received by the crops.

In order to achieve the best and most favorable light conditions, you first need to focus on the development of your own greenhouse, analyze what kind of investment is the most ideal, and also need to consider the greenhouse itself and those that can be optimized and improved.
The first point that needs to be considered is how to maximize the use of the basic natural conditions in the greenhouse, that is, natural light. Optimum use of the gifts from nature is the first step of development in accordance with local conditions, so as to achieve more energy into the greenhouse under the most self-contained situation.

In addition to a good understanding of the local basic climate conditions, for the construction conditions of the greenhouse itself, if you want to increase the degree of light entering the greenhouse, you can think from the following aspects:

Different covering materials and coatings:

The use of this kind of covering products on the top of the greenhouse can effectively help the sunlight to be more evenly distributed in the greenhouse, not only on the horizontal surface, but also on the vertical surface, that is, reducing the light density on the top of the plant, so that the plant The light exposure at the bottom can also be increased, allowing crops to absorb energy in a more balanced manner for photosynthesis. Of course, in view of the different local climate and the relevant characteristics of the crops, there are coatings that can help isolate more excess heat inside the greenhouse in summer and prevent crops from high temperature or burns.

Optimization of the use of the curtain to maximize the entry of light:

As an indispensable part of greenhouse construction, screens can be installed, selected and used in combination, and growers can also work hard to achieve the optimal plan design for crop growth in the greenhouse, especially in the face of the changing seasons of the greenhouse. Challenges of different temperatures, humidity and radiation levels inside and outside. In recent years, various screen manufacturers have also invested a lot of energy in the research and development of the material of the screen, and strive to bring more convenience and combination advantages to the growers in the realization of the material and structure of the screen.

Clean up floating dust and green algae on the roof. In addition, in winter, the importance of light for crops in the greenhouse will be more prominent. Because the total amount of natural light is already very limited, it will become more difficult to collect enough light for crops from nature. At this time, the use of fill light is a natural choice.

In order to allow the growth and development of crops in the greenhouse, it is necessary to strictly control the environmental humidity in the greenhouse, mainly adjusting the air humidity and soil humidity. Next, we will introduce how to adjust the humidity of the greenhouse.
1. Air humidity
  The purpose of air humidity regulation is to reduce the relative humidity of indoor air and reduce condensation on crop leaves. There are four ways to reduce air humidity in modern greenhouse production:
  (1) Ventilation
  Ventilation is a simple and effective way to adjust the humidity environment of a greenhouse. The humidity in the greenhouse is generally higher than that of the outdoors. The air with relatively low humidity is introduced through ventilation, which can dilute the indoor air.
  (2) heating
   Under certain indoor air humidity conditions, increasing the temperature of the greenhouse through heating can naturally reduce the relative humidity of the indoor air. If ventilation and heating can be combined, the relative humidity of indoor air can be effectively reduced.
  (3) Improve irrigation methods
   In the greenhouse, water-saving irrigation measures such as drip irrigation and micro-sprinkler irrigation can reduce ground water collection and significantly reduce ground evaporation, thereby reducing the relative humidity of the air. Similarly, the use of plastic film covering can also evaporate the ground water vapor.
   (4) moisture absorption
  The use of moisture-absorbing materials such as lithium oxide to absorb moisture in the air can reduce the moisture content in the air, thereby reducing the relative humidity of the air. In some cases, the greenhouse needs to be humidified to meet the needs of crop growth.
   2. Soil moisture adjustment
   For greenhouses, the purpose of soil moisture regulation is to meet the water demand of crops, so the amount of irrigation should be determined according to the water demand of different crops in different growth periods.
  Through the above introduction to the humidity adjustment of the greenhouse, we know that the humidity can be adjusted from the two aspects of air and soil, but you also need to pay attention to the above mentioned content during operation.

While the threat of coronavirus (COVID-19) continues to impact activity around the world, people all over the world are trying their best of promoting production and protecting people’s livelihood on the basis of strict prevention and control of the COVID-19.
First of all, allow me congratulations to one of our customer in Africa is nearly finished the installation of the Muti-span film greenhouses by himself, a video from the customer as following:

Secondly, those greenhouses are designed, fabricated and sold by us, how he set up the greenhouse without we dispatch a technician for guiding at site?
1, We supply the detailed installation instruction manual.
2, We answered the questions in time during the set up, we have our team to working on the after-service issues on China time 8am to 11pm.
3, We check the details from the photos which customer sent us, and ask customer to correct it if there is any not correct.
4, The customer can read the drawing.
5, The customer read carefully of the installation manual before the each step of the installation, and prepare all the materials one day or two days before the installation according our material list.
6, The customer can get the team for civil engineering installation, greenhouse structure installation and hydroponic growing system.

7, The customer shares the progress of installation to the supplier, the supplier response in time.

 1.Selection of strawberry varieties in greenhouses

After years of development in our country’s strawberry market, our chief has to choose popular varieties, because popular varieties are some varieties that have been tested in the market for many years. They are good regardless of their yield and taste, such as cream strawberry, red face, sweet Charlie , Nvfeng, etc. At the same time, virus-free seedlings are currently popular in strawberry seedlings. We need to order strawberry seedlings from the seedling farm. We can listen to the opinions of the seedling farm. Professional virus-free strawberry seedlings have high yield, good appearance, and strong disease resistance. At the same time, buying seedlings directly can save yourself the time for seedlings. In addition, strawberry seedlings are generally used once a year, and degradation will occur if they are continuously cultivated.

2. Strawberry planting matters
2.1. Planting time

The planting time is from early September to early October. Ordinary ground planting needs to prepare the ground 25 days before planting, and apply 5,000 kg of high-quality decomposed organic fertilizer per acre, 100 kg to 150 kg of biological potash fertilizer, 30 cm deep, ridge height 10 cm to 15 cm, and ridge surface width 40 cm ~50 cm, ridge spacing 15 cm ~ 20 cm, north-south ridges, sunny, sterilization and insecticide for planting. If you use three-dimensional elevated planting, you only need to lay the organic matter in the cultivation tank. Generally, the organic matter can be used for several years with integrated water and fertilizer irrigation equipment.

2.2. The choice of greenhouse
Strawberry is a low-temperature planting crop, as long as the temperature inside the greenhouse is higher than four or five degrees above zero, it can be planted. At present, some agricultural parks like to use glass multi-span greenhouses for the cultivation of elevated strawberries, which has the effect of sightseeing and picking.
2.3. Temperature management during the bud to the first flowering period, the suitable temperature during the day is 20℃～30℃; during the harvest period, the temperature is above 8℃; the temperature in the shed during the day should be ventilated in time. Bottom wind.

2.4. Flowering period management The optimal temperature during the flowering period is 20℃～25℃ during the day, 5℃～6℃ at night, and the minimum temperature cannot be lower than 3℃; the optimum humidity in the shed during the flowering period is 50%～60%. If it is too large, timely ventilation should be required. Wet; no watering or spraying during the flowering period; no fertilization or spraying during the flowering period to prevent damage to the flowers; pollination by bees during the flowering period.

3. What is the yield of strawberries

The ripening period of strawberries is different, so one crop of strawberries should be picked in batches, usually every two or three days. The yield per mu of strawberries in one season depends on the variety, some are relatively high, up to 3 tons, and generally 1 ton. about. The above is the traditional planting mode. If the elevated strawberry planting method is used, the planting quantity will be about twice to three times that of the traditional planting, so the output will be correspondingly turned over.

Strawberry is a well-loved agricultural product. We growers need to regain confidence and actively resume production. At the same time, we also need to actively try online sales and surrounding group purchases to stop losses.
Pay attention to greenhouse engineering technology and serve modern agriculture

Strawberry likes warm and cool climate:

Strawberry root system growth temperature is 5-30℃, suitable temperature is 15-22℃, the suitable temperature for stem and leaf growth is 20-30℃, buds will be frozen at -15-10℃, the temperature of flower bud differentiation period must be kept at 5-15℃, and the flower will bear fruit 4-40 ℃. In summer, when the temperature is higher than 30℃ and the sunshine is strong, shading measures should be taken.

Strawberry is a light-loving plant, but it has strong shade tolerance:
When the light is strong, the plant is short and strong, the fruit is small, the color is dark, and the quality is good.
Medium light, big fruit, light color, low sugar content, longer harvest period.
Too weak light is not good for strawberry growth.
Strawberry's watering requirements:
Strawberry has a shallow root system, a large amount of transpiration, and at different growth periods the water requirements slightly different. Strawberries are not tolerant to waterlogging.
The correct watering time:
usually it is necessary to choose to do it in the afternoon on a sunny day. If it snows or rains, it is not necessary to water, otherwise the environmental humidity in the greenhouse is too high and it is easy to cause disease.
Water should not be watered at noon, especially when the flowering period is approaching, it will interfere with normal pollination, and the grown fruits are prone to deformities. After entering the blooming period, the daily watering amount should be controlled, and the strength of the wind should be converged, otherwise it is easy to cause poor pollination and fertilization.

In the greenhouse, the root system of strawberry is usually shallow, but the leaf area is larger, and it likes a humid climate. The amount of irrigation should not be too much, otherwise the roots will not be able to breathe freely, it will be easy to rot and blacken, and finally the whole plant will die.

can be used, and fertilizer can be added at the same time as watering. This irrigation method can effectively improve the humidity, reduce the occurrence of diseases, and at the same time increase the surface temperature, maintain the normal air permeability of the medium, and promote the development of the root system.
Management after irrigation is also very important. You can usually check the weather forecast before irrigation. If it rains continuously in the next few days, you can seal the greenhouse after watering and wait for the temperature to rise before ventilating.
Regarding watering the strawberries, there is one more thing to pay attention to. Control the temperature of the water, especially in winter. If the water temperature is too low, it will affect the development and quality of the fruit. It is best to keep it at about 25 degrees.