Cultivating strong seedlings is the basis for high yield and quality. "The strong seedlings are half-received", only the strong seedlings can achieve the purpose of early maturity, high quality and high yield. However, because the seedlings are sensitive to external conditions and the weather is erratic, seedling abnormalities often occur, which affects normal growth.
Coping strategies for abnormal seedlings:
Unsuccessful emergence
The geothermal line or the fire channel is used to warm the seedlings. When laying the geothermal line, the spacing of the front of the greenhouse is 5cm-6cm, and the spacing of the rear of the greenhouse is 8cm-10cm, so that the bed temperature is uniform.
After sowing, the thickness of the covering soil should be uniform, and cover the mulch on the seedbed to keep the seedbed humidity uniform.
When the seedlings are not clear or there are no signs of emergence, the seeds in the seedbed should be inspected. If the radicle is yellow and rotten at the tip of the radicle, the seed can not germinate properly. Look for the cause, improve the environmental conditions of the seedbed, and immediately replant; if the radicle tip Still white, indicating that it can germinate normally, temperature and humidity management should be strengthened to promote seed germination.
When large and small seedlings appear, the seedlings can be moved to the lower temperature of the front of the greenhouse, and the seedlings are placed near the back wall of the greenhouse to make the seedlings uniform and uniform.
Unearthed "wearing a hat"
The thickness of the covering soil should be suitable, generally 1cm-1.5cm. After sowing, the seedling bed is covered with a layer of mulch, which can heat up and keep the soil moist, making the seed coat soft and easy to fall off.
When the soil is thin or there is crack on the bed surface, it is necessary to spray water properly and cover a layer of moister fine soil to increase the wetness of the soil surface and the friction of the soil on the seeds to help the cotyledons unshell.
For a small number of "caps" seedlings, artificial shelling can be carried out in the morning when the shell is moist and soft.
Root
Improve seedling conditions, maintain proper temperature, strengthen ventilation and dehumidification, dilute soil in a diligent manner, increase permeability; control watering, especially if it is not watered on cloudy days.
If the soil is too wet, it can be sprinkled with some fine dry soil or coal ash to make the bed soil temperature rise as soon as possible.
Multi-layer cover is used to facilitate the heat preservation and the rise of the ground temperature, and temporary warming is carried out in the low temperature continuous rain, rain and snow days.
Burning root
The organic fertilizer used in the production of nutrient soil must be decomposed, and the nutrient soil should be used as little as possible or without fertilizer.
If rooting occurs, the amount of watering and the number of watering should be appropriately increased to reduce the concentration of the soil solution, depending on the condition of the seedling, the sensation and the weather.
Chang Miao
Even in the yin, rain and snow, the opaque cover should be removed to make the seedlings see light.
After the emergence of the seedlings, the night temperature was maintained at about 15 °C. As the seedlings grew, the temperature difference between day and night was gradually increased, and the amount of watering and nitrogen fertilizer application was appropriately controlled, and the 0.3% potassium dihydrogen phosphate solution was sprayed on the foliage.
The seedlings are seeded in time, and the seedling density of the seedlings is generally required to be 10 cm square. If the seedlings are used for nutrition, the seedlings can be thinned.
Stiffened seedling
Strengthen the temperature increase and heat preservation measures, reduce the ventilation volume, and make the seedbed receive more light and increase the bed temperature as much as possible. In areas where low temperature weather often occurs during the nursery season, warm seedbed seedlings should be used.
In the strong seedling stage, the management of fertilizer and water should be watered at the right time.
Pay attention to the proportion of fertilizer in the nutrient soil. The dead seedlings caused by lack of fertilizer can be sprayed with potassium dihydrogen phosphate.
Tripping seedling
The plots with high topography and good drainage are selected as seedbeds, and 200 g of Bacillus cereus is added to each nutrient soil for disinfection.
Strengthen the management of the seedbed, do a good job of heat preservation and ventilation, do not water the rainy days, keep the seedbeds dry and not wet.
Chemical control: The diseased seedlings were found to be sprayed with 20% carbendazim and 72.2% of chlorpyrifos 1500 times in time; and the germination of the soil to the seedbed was carried out in the morning when there was no dew on the sunny day. The effect was good.
Sectional Door Accessories: motor 220V-380V, control box, spring break device, cable break device , aluminum alloy rope pulley, enhanced shaft bracket, air bag system, duplex enhanced guide wheel bracket.
Detail introduction for above main accessories
1.Motor and controller:
The garage door operator is designed for residential overhead sectional and tilt doors.
The operator memorizes the limit positions and unique braking system that slows the unit down at the end of its travel.
Rolling code remote control with max. 20 pcs hand transmitters.
The operator is equipped with a manual release lever which allows manual operation of the door in case of power failure.
The controller has a security LOCK function which prevents operation of the door from transmitter.
2.spring break device:
Sectional doors are hinged and they bend in the tracks as the door opens and closes. Many of these doors are counterbalanced with extension springs, also designated "stretch springs," and they have seven characteristics. The length is the measurement of all the coils pressed together. This, along with the inside diameter of the coils and wire size - the thickness of the wire from which the springs are made - determine the stretch, the distance the spring is extended - normally half the door height, and pull, the force the spring pulls when stretched its normal length. The type of ends determine how the ends of the spring are mounted. The initial tension is the percentage of pull needed to separate the coils. This is determined by the pitch with which the springs are wound. On sectional garage door springs this is normally 15 percent. For example a 100 pound pull spring requires 15 pounds of weight to separate the coils; when a door is open the two springs will support 15 pounds of door weight without any stretch.
Most extension springs are made of oil tempered wire. These are normally coated or painted. Some springs are made of galvanized wire.
3.able break device:
cable break device ,door hardware
adjustable bottom bracket .
the raw material hot plate
zinc plated
safety device
adjustable bottom bracket
the raw material hot plate
zinc plating
spring safety device ,2" and 3" safety device
once the cable is broken ,this devoice can keep the hurt away from the door falling
4.aluminum alloy rope pulley
Equipment: CNC stamping/punching machine, CNC bending machine, CNC cutting
machine, 5~250 tons punching machines, welding machine, polish machines...
Processed material: stainless steel: copper, carbon steel
Surface treatment: Hot galvanized, polishing
Making process:Stamping, deep drawing,bending, punching, laser cutting,threading,
welding, tapping, riveting, grinding
5.air bag system
It is a safety device. When the door is down to hit something, it will up automatically.
Operation pressure:<3mbar
Battery:CR2032*2
Battery lifetime>1 year
Emission frequency: 315MHZ
Emission power:<10mW
Receiver power source:12V
6.duplex enhanced guide wheel bracket
Determining the right type of sectional door roller for your garage door tracks can be a little confusing, especially when you do not know what you need to look for in a garage door roller. To simplify things, there are two primary things you need to be aware of. First are the actual dimensions of the roller, and second is purpose that you will be using the door for. You can read below about measuring your roller and choosing the right quality of material for your door.
Other Door Accessories,Electronic Door Accessories,Automatic Door Accessories,High Speed Door Radar Detector
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfgaragedoor.com