How to design an intelligent control system for temperature and humidity in vegetable greenhouses

Guangzhou Zhaoyun Technology.

Introduction to the agricultural automation industry.

Guangzhou Zhaoyun Technology is committed to applying the experience accumulated in industrial measurement and control and industrial automation to the agricultural automation industry to promote the further development of agriculture from mechanization to automation and informatization.

Although the state has been vigorously supporting the development of agriculture in recent years, due to the poor agricultural foundation, many places in China's agriculture are not even mechanized development, not to mention automation and informatization. The main reason for this phenomenon is that farmers have insufficient understanding of modern science and technology, so Guangzhou Zhaoyun Technology is not only committed to the research and development and production of agricultural automation, but also the promotion of modern science and technology to farmers at this stage is still a very important work.

Guangzhou Zhaoyun Technology hopes to respond to the first document of 2012: "Several Opinions on Accelerating Agricultural Science and Technology Innovation and Continuously Enhancing the Supply and Security Ability of Agricultural Products", and contribute to the realization of agricultural automation!

Our understanding of mechanization, automation and informatization.

Mechanization: Although machinery replaces some people's heavy physical work, it still needs to be controlled by people and cannot fully liberate the labor force.

Automation: To a large extent, the labor force is liberated, the personnel do not have to be on duty, and the automatic control system is completely handed over to the detection and control, and only the alarm can not be handled by the human intervention.

Informatization: In the advanced stage of automation, by collecting and sorting out various information on crops and livestock in the process of planting and breeding, such as temperature and humidity, illumination, air quality, water quality, feed, environment, etc., the impact on the growth of crops and livestock is the most valuable, and this information can be promoted and copied to all farmers. It can be said that whoever has this information has the success and wealth in his hands.

Our Goals:

Promote agricultural automation and strive for agricultural informatization!

We may collect the information displayed:

Air, soil, water, temperature, humidity, carbon dioxide concentration, oxygen concentration, E. coli number, ......

Sound decibels, bio-infrared detection, illuminance ......

Devices that we can control:

Ventilation equipment such as pumps, fans, air conditioners, electric heating and other cooling and heating equipment, motors, spray solenoid valves and other action equipment ......

Agricultural Automation Case:

1. The application of automatic collection, display and control of temperature and humidity in agriculture Automated greenhouses.

2. Application of water quality monitoring in fish farming.

Information on agricultural automation.

1. Introduction to agricultural automation.

2. The development trend and market prospect of agricultural automation.

..Dr. Zhang from Ningxia University recently demonstrated a system at an exhibition. Relatively perfect.

You can talk to Mr. Zhang, or find their subordinate service company, find Mr. Zhang Guangdi, and you can also talk to Mr. Zhang.

The next method please... Ha ha.

The first problem: compound humidity on planting.

The effect of the preparation of the matter is not too great, the humidity is too low, it will accelerate the transpiration of plants, increase the consumption of water, the humidity is too high, it is easy to breed pathogens.

The second problem: the effect of temperature on the growth of plants varies according to different varieties, and some plants are not too sensitive to temperature requirements, as long as it is the survival temperature of ordinary organisms, such as deciduous trees. Some plants like heat, such as many tropical plants, and some plants like cold, such as snow lotus in the sky; Some plants will enter reproductive growth (flowering, fruiting) at higher temperatures, such as spinach, and some must go through the low-temperature vernalization stage to differentiate flower buds, such as wheat, so the relationship between temperature and plant growth should be determined according to the variety.

3. The temperature control of the greenhouse can be shaded and ventilated (wet curtain cooling), and the humidity is generally adjusted by spray.

Fourth, in the process of temperature and humidity, temperature and humidity are given priority, and then humidity is considered, so there is naturally no contradiction.

1. Too high or too low temperature can inhibit plant growth.

2. Humidity regulates plant physiology, too high and too low will cause disease.

3. The greenhouse is regulated by a special control system.

4. All of them are automatic adjustment, and there are two kinds of digital control or analog control.

1. Any organism has a suitable temperature for growth, and it grows at a suitable temperature, with fast speed and large biomass. If the temperature is too high or too low, it will hinder the positive of the vegetables.

A: It grows often, and even causes burns and frost damage, resulting in the death of vegetables.

2. If the humidity is too high, the transpiration of vegetables (the process of absorbing water from the soil and expelling it from the stomata) will be weakened, the vitality will decrease, and the germs will easily breed. If the humidity is too low, it is easy to cause water loss in vegetable crops.

3. Vegetable experts are generally bullshit. Vegetable farmers generally use ventilation to regulate temperature and humidity. High temperature or high humidity, ventilation, conversely, no ventilation.

4. Of course, there will be contradictions. In the event of a contradiction, the temperature takes precedence, and the humidity is adjusted under the condition of ensuring the temperature requirements.

One is to ventilate, which is the most basic but also the most effective way to reduce humidity in greenhouses and other facilities. Ventilation should be done as much as possible in the vegetable greenhouse, especially at noon, even if the weather is low, the film should be properly removed for ventilation.

Another method is to cover with plastic film, vegetable greenhouse crops with plastic film covering, which can effectively improve ground temperature, promote crop growth, and reduce the number of ground water evaporation and irrigation, so as to achieve the purpose of thermal insulation and humidity reduction in vegetable greenhouses, is a good way to kill multiple birds with one stone.

Then you can also choose non-drip film, and the ridge vegetable greenhouse can be covered with non-drip film, which can greatly reduce the amount of water accumulation on the surface of the film, and is conducive to light transmission and increase the temperature in the shed.

The humidity in the vegetable greenhouse facilities is large, and the soil and air humidity will be increased more if the method of watering and fertilizing the soil surface is taken, therefore, the greenhouse crops must be applied with foot fertilizer before sowing, and the growth period should be watered and topdressed as little as possible. If crops lack fertilizer and water, new methods such as drip irrigation and micro-irrigation can be used if conditions permit.

If the humidity in the greenhouse is too large, you can sprinkle some grass ash or dry fine soil on the ground, and you can also put a few piles of quicklime in the shed to facilitate moisture absorption and reduce the humidity in the shed.

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Isn't there an air vent? Ventilation is fine.