In the winter and spring season, vegetables grown in plastic greenhouses often suffer from weak light due to lack of light, referred to as “low light diseaseâ€. The general symptoms are: poor plant growth, thin stalks; thin leaves, light color, easy to yellow; poor flower bud differentiation, abnormal flower shape, serious drop and fruit drop. Low light barriers have a certain impact on the yield of vegetables.
Prevention measures are mainly to improve lighting conditions in the shed as much as possible. When planting, increase the row spacing and reduce shading between the plants; keep the shed membrane clean and prevent the membrane surface from adhering to water droplets and dust; when the external temperature reaches 15°C in the middle and late stages of vegetable growth and before and after noon, properly expose some of the shed film. The sun shines directly into the shed. According to another test, the use of polyester aluminum film spliced ​​into 2 meters wide, 3 meters long reflective screen, hanging in the plastic greenhouse (or greenhouse) after the upper end of the column, hanging down to the ground, can increase the ground by 40% -43%, The greenhouse temperature increased by 3°C-4°C, the ground temperature increased by 1.8°C-2.9°C, the yield of tomato increased by 41.8%-58.1%, and the quality of the fruit was improved; the silver gray film or aluminum foil was laid on the ground, which also increased the light intensity among the plants, resulting in fruit It is well colored and prevents premature aging of the lower leaves.
What is Mini Camera
Micro mini camera is a product of modern high-tech, also known as micro monitor. It has the characteristics of small size, powerful function and good concealment.
Micro cameras are widely used in aviation, commerce, media, enterprises, institutions, families and other industries. The appearance of micro cameras has brought convenience to people's lives. At the same time, some phenomena related to corporate secrets and personal privacy have also emerged.
In 1991, the world's first camera (called CoffeeCam) first appeared in the Trojan room coffee pot at the University of Cambridge, UK.
The oldest camera, FogCam of San Francisco State University, has been used since 1994
In 1996, AXIS Communications published the first IP Camera using Internet architecture as the basis for signal transmission.
In 1999, AXIS Communications published IP Camera based on Linux system.
Wireless camera
Wireless equipment is used stably in domestic wireless environment. The micro wireless surveillance camera has the characteristics of high stability, high speed, long distance and multi-point testing. It can play a huge role in the fields of environment, energy, construction, transportation, medical treatment, industrial machine condition monitoring, etc., especially when the cabling is complex, the cabling cost is high, the long-distance and large-scale transmission of data and the mobility demand is high.
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