1. Compound fertilizer should not be used for seedling fertilizer and middle and late fertilizer.
The compound fertilizer has a long effect and should be used as a base fertilizer. The compound fertilizer processed and granulated is slower than the powdered fertilizer, is not easy to be lost and volatilized, and has a long duration of fertilizer effect. It is easy to use as a base fertilizer, and the general dosage is 30-40 kg. Compound fertilizer should not be used for seedling fertilizer and mid-late fertilizer, so as to avoid crop steepness and steepness.
2, pay attention to the use of nutrients.
Different brands and different concentrations of compound fertilizers use different raw materials, and the production should be selected according to soil type and crop type. Nitrate-containing compound fertilizer should not be used in leafy vegetables and paddy fields; compound fertilizer containing ammonium ions should not be applied on saline-alkali soil; compound fertilizer containing potassium chloride or chloride ion should not be used on chlorine-free crops or saline-alkali soil; Compound fertilizer containing potassium sulfate should not be used in paddy fields and acidic soils. Otherwise, it will reduce fertilizer efficiency and even poison crops.
3. Pay attention to the use with elemental nitrogen fertilizer.
Crops require less nitrogen fertilizer during seedling stage. Therefore, crops with compound fertilizer as base fertilizer should be supplemented with quick-acting nitrogen fertilizer in time for topdressing according to the fertilizer requirements of different crops to meet crop nutrient requirements.
4, pay attention to avoid direct contact with seeds or fertilizers.
The compound fertilizer has a high nutrient content. If it is in direct contact with the seed or seedling roots, it will affect the emergence of seedlings and even the burning of seedlings and rotten roots. When planting, the seeds should be separated from the point application and the compound fertilizer by 5-10 cm. It should not be directly applied to the same point with the seeds, causing fat damage.
5. Pay attention to choosing the right concentration.
Most compound fertilizers are formulated according to the average nutrient status of soil types in a certain area and the ratio of fertilizer required for large crops. There are high, medium and low concentration series of compound fertilizers on the market. Generally, the total concentration of total nutrients is between 25% and 30%, the medium concentration is between 30% and 40%, and the high concentration is above 40%. It is necessary to use economical and efficient compound fertilizers depending on the region, soil and crops. Generally, high-concentration compound fertilizer is used in economic crops, which can make crops excellent in quality, less fertilizer residues, and high utilization rate.
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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.hfautodoors.com