Since the introduction of LED display screens, with the development of China's urban construction and the world's vigorous promotion of energy conservation and emission reduction, as a new generation of environmentally friendly energy-saving products - as a new advertising medium has also been sought after by everyone. Indeed, the LED display has brought a certain improvement to the city with its unique image, but at the same time, we should also see the inadequacy of LED display as an emerging media.
1: structural design
Due to its own cabinet structure, the outdoor LED display is very heavy when installed outdoors in large areas. The display that should be considered for the outdoor display should be the corresponding structural design. The structural design should take into account the effects of wind, vibration, load and other factors on the display; secondly, the shape and structure of the display itself and the coordination of the building and environment to which it is attached. Finally, it is necessary to consider the influence of the environmental factors on the display screen, such as the humidity in the air, the salt and alkali content.
2: Light pollution
In recent years, with the development of science and technology, people's requirements for environmental protection are getting higher and higher. The light pollution brought by urban lighting has also become the focus of people's attention. So is the LED display screen considered to be light pollution? According to the current international definition of light pollution, it is usually divided into three categories: white bright pollution, artificial chalk and color light pollution. At present, China only has regulations on the glass curtain wall in Bailiang pollution, and there is no relevant regulation on artificial chalk and color light pollution. However, considering that color light pollution does cause people to feel uncomfortable, it should belong to "light pollution." Therefore, when designing and installing the display screen, the protection and management of light pollution caused by the display should be considered.
3: LED maintenance
As an emerging advertising media, the corresponding failures will definitely occur during the use of the display screen. Therefore, when installing the display screen, it is necessary to consider the maintenance of the display screen in the future.

NPK Organic fertilizer

Organic Fertilizer is mainly derived from plants and animals, it is a carbon containing material which is applied to the soil to provide plant nutrition as its main function. Through the processing of biological substances, animal and plant wastes and plant residues, the toxic and harmful substances are eliminated and beneficial substances are increased, including a variety of organic acids, peptides, and rich nutrient elements nitrogen, phosphorus and potassium. It can not only provide comprehensive nutrition for crops, but also can increase and update soil organic matter, promote microbial reproduction, improve the physical and chemical properties and biological activity of soil, which is the main nutrient of green food production.

Organic fertilizer 1

Organic fertilizer 2

N+P2O5+K2O

8%min

10%min

Nitrogen content

10%min

16%min

K2O contect

2min.

As

15mg/kg max

15mg/kg max

Hg

2mg/kg max

2mg/kg max

Pb

50mg/kg max

50mg/kg max

Cr

150mg/kg max

150mg/kg max

Cd

3mg/kg max

3mg/kg max

PH Value

5.5-8.0

5.5-4.0

Moisture

6% max

6% max

Humic acid

10% min

10% min


Application Range

It is suitable for all crops and plants.

Application Method and Amount

As base fertilizer, the amount is no more than 1 ton per acre; for greenhouse, no more than 500 kg per acre.

As additional fertilizer: broadcast in rows, holes, and circles (for fruit trees).

The amount should be adjusted in accordance with different crops, soils, types, and outputs.




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