Hole-eye topdressing method Use a raft, 20 to 30 cm away from the main root of sweet potato, hit a hole about 30 cm deep, apply the appropriate amount of ternary compound fertilizer, and seal it with wet soil. If you use a hole on each side of the ridge to topdress, the effect is better. This method can increase production by about 20% per mu.
When the sweet potato is inflated and cracks appear on the ground, use 500 kg of potassium dihydrogen phosphate per acre to add 400 kg of water, or use 2.5 kg of urea and 10 kg of superphosphate, add 500 kg of water, and mix with fertilizer to grout, each strain Irrigation is 0.7 to 1 kg. After 15 days, the supernatant of 100 kg of ash and 500 kg of water (soaked for 4 hours) was used to grout the cracks. After the irrigation, the cracks were sealed with soil. This method can increase the yield per mu by more than 300 kg.
Foliar topdressing method Foliar spray 0.3% potassium dihydrogen phosphate solution, spray once every 7 days. This method can increase production by 18% to 20% per mu.
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.selfrepairinghighspeeddoor.com