The Right Way to Ventilate Your Greenhouse

China glass greenhouse manufacturer to share with you: Greenhouse is a collective term for plastic greenhouses, multi-story greenhouses, single greenhouses, vegetable greenhouses, suitable plastic greenhouses, solar panel greenhouses, smart greenhouses, etc. In places without contagious soil, well drained, sheltered from the sun, sunny and dry. The development of greenhouse ventilation has great significance for the production and operation of greenhouses. The space in the greenhouse is small, and the shelter is relatively sheltered from the wind. In addition to the use of pesticides and fertilizers, the carbon dioxide content in the small environment of the greenhouse is continuously reduced, and more and more harmful gases are accumulated, causing crop diseases in the greenhouse. The occurrence of adverse effects on the growth and development of crops in greenhouses. Therefore, when the content of air components in the greenhouses does not meet the growth needs of the crops in the greenhouses, ventilation must be performed to eliminate the foul air in the greenhouses. At the same time, replace the fresh air outside the shed. However, how to grasp the ventilation time and the ventilation volume has become a major problem that plagues greenhouse greenhouse workers. The development trend of large-scale greenhouse ventilation is basically from manual control to automated control, and from traditional methods to modernization and standardization. In particular, the large-scale application of new technologies and materials in greenhouse ventilation rack put forward more standardized and high requirements, and the traditional ggreenhouse ventilation control alone cannot regulate the production and operation of greenhouse greenhouses. Based on such a development, we must fully study the development of greenhouse ventilation, correctly face the different requirements of different greenhouses for gout, realize automatic management and control of greenhouse ventilation, and promote the healthy and sustainable development of modern agriculture.

Pinion for Shading System

First of all, fully understanding the development of greenhouse ventilation is an objective requirement for the development of greenhouse ventilation in modern agricultural development. The development of modern agriculture requires that the wind direction of the greenhouse be developed under the direction of automatic control, standardization and scientificization. It can automatically measure the carbon dioxide required for crop growth in the greenhouse, and harmful gases that endanger crop growth. Air; To grasp the development of greenhouse ventilation, we must break the traditional concept, reform the management model, and open up new ways of greenhouse ventilation. Secondly, fully understand the development of greenhouse ventilation is an important symbol of the modernization of greenhouse ventilation. Whether the modernization of greenhouse peach ventilation can be realized is the key to the development of greenhouse ventilation, which determines the future development of greenhouse peach ventilation and its contribution to modern agriculture. Third, fully understand the development of greenhouse ventilation is the needs of greenhouse ventilation itself. Fully understanding the development of greenhouse ventilation will help employees in greenhouses have a clear and clear understanding of greenhouse ventilation, accurately grasp the pulse of greenhouse ventilation development, increase investment in science and technology, and use a large number of new technologies and materials to ventilate greenhouses The scientific, standardized and automated development has laid a solid foundation.

Importance of Nutrient Solution Formulation in Hydroponic Systems

The key to the indoor hydroponic system is undoubtedly the formula of the nutrient solution, which mineral elements the plants need, and the concentration at which the plants can absorb it are all questions that need to be answered when preparing the nutrient solution. From the famous willow experiment in the 16th century, plant physiology has undergone development for centuries. Plant physiologists have divided the nutrients necessary for growth and development absorbed by plant roots into a large number of elements and trace elements. A large number of elements are nitrogen, phosphorus, and sulfur. , Potassium, calcium, magnesium, silicon, these elements are elements required by plants, so common artificial fertilizers are mostly nitrogen, phosphorus and other fertilizers; trace elements include iron, manganese, zinc, copper, molybdenum, chlorine, sodium, Nickel, etc. These mineral elements exist in the form of mineral ions and are absorbed by plant roots.

With the exception of carbon, hydrogen, and oxygen, all nutrients necessary for plant growth are absorbed into the plant by the roots. Although plants differ in the amount of macroelements and microelements required, they are all essential nutrients, each of which plays a unique role in plant growth. The lack of any element will affect the normal development of plants. Different plants have different manifestations of lack of mineral elements. The side dish of basil in three cups of chicken is a common hydroponic cultivation crop in a plant factory. Dr. Neil Mattson and Tanya Merrill of Cornell University in the United States have relatively complete the deficiency The comparative experiments show that the lack of each mineral element will cause diseases to plants:

The lack of nitrogen fertilizer will lead to yellowing of old leaves and smaller plants;

Lack of phosphate fertilizer causes purple spots to appear on old leaves, long-term phosphorus deficiency causes purple spots to expand, leaves lack green, and plants flower early;

Potassium deficiency will cause necrosis of the basil leaves, and the leaves turn yellow;

Calcium deficiency leads to necrosis of the young leaves and yellowing of the roots;

Lack of magnesium will cause leaf lack of green, and further deterioration will cause leaf necrosis;

Sulfur deficiency will cause the whole leaf to turn yellow, and the growth of the plant will be significantly reduced;

Long-term iron deficiency will cause green deficiency symptoms in the young leaves first;

Boron deficiency can lead to a lack of green leaves and inhibited root growth.

Obviously, the preparation of nutrient solutions requires repeated experiments to adjust the concentration of various mineral elements. For different types of crops, or different varieties of the same crop, special nutrient solutions are prepared, and even the same variety of crops have different mineral levels during different growth periods There will be differences in nutritional needs. In addition, all kinds of mineral ions are dissolved in the nutrient solution, and the total ion concentration and pH of the nutrient solution must be controlled within the range suitable for plant growth. This must take into account the chemical reaction and solubility between the various ions.

If it is said that advanced technical equipment provides a solid hardware foundation for the operation of plant factories, then the nutrient solution formula and light formula are the most important technical backing for plant factories to achieve efficient and high-quality production. The plant factory of Zhonghuan Yida has customized nutrition formulas for plants when cultivating different varieties of fruit vegetables and leafy vegetables, ensuring that the different needs of different crops for mineral nutrition are met one by one, thereby achieving efficient production.

The Central Yida plant has nutrient solutions for different crops.

Nutrient solution circulation and control system in plant factory:

Hydroponic cultivation of a plant is simple, but it is different for hundreds or thousands of plants: during the industrial production of hydroponic crops, it is not practical to change water regularly, and during the cultivation process, it may be in the nutrient solution. The algae produced and the toxic substances metabolized by the plant itself will inhibit the growth of the plant, and the properties such as the concentration and pH of the culture medium will also change as the plant absorbs water and nutrients. These factors bring challenges to hydroponic cultivation in plant factories.

At present, the nutrient solution circulation and control system is a very important water and fertilizer control system in a plant factory. It is a technology that recycles the remaining nutrient solution after the plant is used. Automated control.

Intelligent plant nutrient solution circulation control equipment is used in the plant factory of the Central High-Tech Yellow River Delta Agricultural High-tech Industrial Demonstration Zone Project.

The nutrient solution circulation control system mainly includes cultivation beds, nutrient solution tanks, detection sensors, circulating water pumps, filtration and disinfection devices, and automatic control devices.

The nutrient solution in the nutrient solution pool is monitored by a detection sensor to ensure that its ion concentration, pH, oxygen content and temperature are in a range suitable for plant growth. The ion concentration and pH are adjusted by adding a prepared nutrient solution mother or acid-base solution. The increase of the oxygen content is through the circulation of the stirring device or the culture liquid, and the liquid temperature is performed through the heating or cooling device.

The nutrient solution is pumped into the cultivation bed by a pump, and the excess nutrient solution is filtered and sterilized and reflowed into the nutrient solution pool. This is the nutrient solution circulation process.

Indoor Hydroponic System

Optimization of hydroponic system:

The nutrient solution circulation control system realizes the full use of water and nutrients, and avoids environmental pollution caused by the discharge of nutrient solution waste liquid to the outside world. It not only saves resources, but also has the characteristics of environmental friendliness. However, the current nutrient solution circulation control system still has room for optimization.

Although the recycling of nutrient solution saves resources and protects the environment, the organic acids and other substances secreted during plant growth and metabolism are not good for plant growth. This makes the accumulation of harmful substances in the nutrient solution circulating fluid. Removing these harmful substances is extremely beneficial to the realization of nutrient solutions Recycling.

At present, the most suitable method is the photocatalytic method, which uses the strong oxidizing effect of special materials nano-titanium dioxide to absorb ultraviolet light, and decomposes organic acids in nutrient solutions into carbon dioxide, water and other small molecules. The photocatalytic method has been widely used in the purification of environmental pollution, and the application in the purification of nutrient solutions is still in the research stage. This method is not only efficient and non-toxic, but also has no effect on the quality of vegetables. Method of nutrient solution purification.

The growth process of plants cannot be fully quantified. Just as "there are no two identical leaves in the world", each round of crop growth will cause different changes in the composition of the nutrient solution, although the concentration and pH of the nutrient solution can be real-time Monitor and make regulatory decisions accordingly, however, the detection of a single nutrient element still cannot be monitored in real time.

With the continuous development of sensing technology in the agricultural field, the detection technology of single nutrient elements is also in the stage of rapid development. Maybe in the near future, the single-nutrient element real-time detection technology can be applied to the nutrient solution circulation control system. When a crop grown in a plant absorbs more of an element, it can detect the rapid decrease in the concentration of the element in time, and then increase the dose of this element in the nutrient solution.

Hydroponics System in Plant Factory (Part 1)

The biggest advantage of a plant factory is that the environment is controllable, which enables agriculture to get rid of the restrictions of the region and the natural environment, and achieve high yield and high quality of agricultural production. The controllable environment includes environmental factors such as light, temperature, and gas, as well as moisture and temperature. nutrition. Today we will discuss the regulation of water and nutrition in plant factories.

Origin of the hydroponic system:

Hydroponics technology is mostly used in plant factories, which is one of the core technologies of plant factories. Hydroponic cultivation, also known as nutrient solution cultivation, is a cultivation technique that makes nutrients needed for plant growth into nutrient solutions for plant absorption. No soil is needed, and the root system of plants grows in nutrient solutions.

The earliest recorded in the history of proposing hydroponics without planting plants in soil was the English Renaissance essayist and philosopher, Francis Bacon. He not only made significant contributions in the history of philosophical development. Engels was called "the first founder of British materialism". Bacon was also a pioneer of experimental science. Until his death, he was still experimenting with the effect of freezing on the preservation of meat. One year after Bacon's death, in 1627, his theory of hydroponic plants was published, and people began to pay attention to hydroponic technology.Since then, after experimental research by scientists, it has been found that distilled pure water cannot meet the needs of plant growth, and the solution containing specific nutrient elements is the key. Therefore, people call the technology of plant growth with a solution containing mineral nutrients called "solution "Cultivation" (solutionculture), this technology quickly became a research hotspot; today, we call this solution cultivation hydroponic cultivation. Hydroponics are derived from Greek, which means that the soil is replaced by water during agricultural cultivation.

Hydroponic System

Why is the indoor hydroponic system so popular?

Since the hydroponic cultivation technology was proposed, relevant academic research and technological innovation have continued, so far it has received widespread attention, because hydroponic cultivation has obvious advantages.

First let's see how the nutrient solution is used by plants. Water is absorbed by the roots and transported to various parts of the plant through the xylem of the rhizome. Part of the water is used for plant growth, and most of it is evacuated through the leaf stomata. Water absorption and transpiration form the water cycle of the plant body; the transport of mineral nutrients depends on the transport of water and flows into all parts of the plant. Therefore, the root system is the most important source of water and nutrients for the plant. Therefore, the external environment of the root system is close Affects the plant's absorption of water and nutrients.

The main source of water and nutrients, therefore, the external environment of the root system closely affects the absorption of water and nutrients by plants.

Water is absorbed by the plant roots, transported to the leaves through the xylem duct, and transpiration from the stomata on the surface of the leaves into the atmosphere. The nutrient solution can provide plants with a steady stream of water and nutrients. This is the difference from crude tea to rice and buffet meals for plants that originally depended on soil moisture and mineral nutrients for survival. Therefore, the growth rate of plants growing in the nutrient solution is much higher than that of the plants growing in the soil, and the artificially controllable nutrition supply improves the product quality.

Without the soil containing various harmful bacteria, hydroponic cultivation avoids a large part of plant diseases and greatly reduces the need for spraying pesticides. Vegetables in plant factories are safe and pollution-free high-quality products.

At the same time, hydroponic cultivation is convenient for automatic operation, saves manpower, and can even achieve the effect of saving water and fertilizer. Taking the Yida Fruit and Vegetable Factory in Central as an example, the hydroponic cultivation technology was adopted to integrate irrigation and fertilization. With the help of pressure system and EC / pH sensor, the liquid fertilizer mother liquor was mixed with water and fertilizer according to the type of crops and fertilizer characteristics. According to the conditions such as temperature, humidity, and light intensity provided by the intelligent greenhouse, automatic intelligent adjustment is performed to realize the quantitative, regular, and proportional supply of water and nutrients during the full growth period, effectively control the amount of irrigation water and fertilization, and achieve scientific planting and increase water and fertilizer The effect of utilization. At the same time, by recycling, sterilizing and reusing the surplus water for irrigation, it can achieve a 50% fertilizer saving rate and a water saving rate of up to 90%.

What are the Benefits of Modern Smart Greenhouses for Growers?

The highlight of the agricultural greenhouse is mainly "wisdom". As a concrete embodiment of modern agriculture, the greenhouse has a full sense of science and technology, and new technologies and new models have completely overturned the traditional agricultural farming methods. By making full use of the Internet of Things technology, the greenhouse is made like a sophisticated workshop.

Environmental temperature and humidity, soil moisture, carbon dioxide and other sensor nodes distributed in the greenhouse can collect environmental information in the greenhouse in real time. And transmitted to the computer terminal via the wireless communication network. After the background big data analysis, the IoT platform can automatically adjust and adjust the specified environmental control equipment according to the manually set parameters, and control water spray, window opening, curtain opening, etc. Precisely control watering, fertilizing, temperature, humidity, etc. Water, fertilizer, temperature, humidity, and carbon dioxide concentration create a high-quality growth environment for plants.

When a modern intelligent greenhouse is not conducive to environmental growth, it will automatically take measures:

1. Insufficient soil moisture, automatically control water valve to spray water

2. If the light is insufficient, automatically turn on the incandescent lamp to supplement the light;

3. If the temperature is too low, the air conditioner will automatically turn on;

4. When the greenhouse temperature is too high, automatically open the skylight, side window, etc .;

The construction of modern agricultural parks has always been a hot spot in the agricultural industry. Today, if agriculture is to develop well, it is necessary to continuously increase the scale of the industry. In traditional agriculture, it takes a lot of manpower and material resources. Robots equipped with artificial intelligence technology will help ease the burden on farmers and greatly reduce land demand for labor. For example, in the planting, management, picking, sorting and other links can be completed by intelligent robots to achieve the intelligentization and automation of agricultural planting.

The modern smart greenhouse greenhouse measurement and control system was born to improve the output and quality of agricultural products, and it was born to engage in agricultural production more efficiently, conveniently and quickly, and to release agricultural labor. The products of modern intelligent agricultural monitoring stations monitor the growing environment of agricultural products in real time, automatically maintain and improve the growing environment of agricultural products, so as to meet the needs of agricultural production.

Agricultural Blackout Light Deprivation Greenhouse

Greenhouse manufacturer believes that agriculture is the basic lifeblood of a country and future strategies: new thinking, new planting, and new future.

Talk about the small details of the use of greenhouse accessories:

The fresh vegetables that everyone eats all year round come from greenhouses. Only with the combination of various greenhouse accessories can a reasonable and comfortable vegetable growing environment. Therefore, any kind of greenhouse accessories in the greenhouse is very important. I will share with you some experiences of using small details of greenhouse accessories:

1. In order to facilitate management work such as ventilation, the roof film and skirt film of the greenhouse must be covered separately. Generally, a three-layer film is used, that is, one ceiling film and two skirt films on the left and right sides. The ceiling film is 7.5 to 8.0 meters wide and the skirt film is 1.2 meters wide. First install the skirt film on both sides, hold it with the card slot, then cover the top film, and use the spring card slot to lock at both ends. Press between the arches with a film line. The membrane junction should be overlapped by 20-30 cm. Press the top membrane on the outside of the skirt membrane. Both sides of the top membrane can be equipped with rocker rods to facilitate opening the top membrane for ventilation. The ground part of the skirt should be sealed with mud. When the greenhouse is covered, windless weather should be selected to prevent wind from unfavorable to cover the film or tear the film. Press the film tape after covering.

2. When the greenhouse is ventilated, first lift the edge of the top membrane upward, and then lower the skirt membrane when the temperature rises. When covering the film, first clamp or fasten the skirt film, and then lower the top film. Diaphragm cover film proceeds in reverse order.

3. After the greenhouse is built, excavate deep trenches around the greenhouse to lower the groundwater level to facilitate the growth of vegetables in the greenhouse.

4. During the use of the greenhouse, due to long sunny and no rain, the shed film is covered with dust, which directly affects the lighting. After 10 sunny days, the transmittance of the shed roof film is 25% different from the unwashed area. The shed film is clean.