Roller shutter door , also known as "shutter door", lots of panel pieces connected together, fixed in the guide rail , take above reel as the center of rotation.
Roller shutter door is used for commercial facades, garages, shopping malls, hospitals, factories and mines and other public places or residential.Electric roller shutter door, especially for large openings, inconvenient to install the ground door , quick opening effect. Such as for the garage door, shopping mall fire shutter door.
Opening methods: Handing driving mode
Rope driving mode
Remote control driving mode
Electric switch driving mode
Roller Shutter Door,Galvanized Roller Shutter Door,Aluminum Roller Shutter Door,Transparent Roller Shutter Door Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.highspeedshutterdoor.com
The top dressing should be sprayed according to the different concentrations of fertilizers. The concentrations of different fertilizers are: urea 1%-3%, potassium dihydrogen phosphate 0.3%-0.5%, borax 0.1%-0.2%, zinc sulfate 0.2%-0.4%, and superphosphate lime leaching 2%-4%. Ammonium sulfate 0.2% - 0.3%.
Huaxian County Shang Hongyan
Crop topdressing has the advantages of quick fertilizer efficiency, high utilization rate, fertilizer saving, remarkable effect, simple and easy to use, etc. There are many kinds of fertilizers, but some are suitable for foliar spraying, and some are not suitable for foliar spraying. Such as urea, potassium dihydrogen phosphate, calcium perphosphate leaching solution, potassium sulfate, borax, zinc sulfate, etc. can be foliar spray, and some chlorine ions, volatile and poorly soluble fertilizers such as ammonium chloride, ammonium bicarbonate, calcium Magnesium phosphate fertilizer, etc., is not easy to be foliar spray.
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