Topdressing of crop roots, quick fertilizer efficiency, high utilization rate, saving fertilizer, remarkable effect, and simple and easy. But to make a scientific and reasonable, to avoid waste and cause fertilizer damage, you need to have the following 10:00:
　　 1. To "prescribe the right medicine": According to crop and soil deficiency, spray on the principle of what is missing. If the seedlings are thin and yellow, indicating that nitrogen deficiency should be based on nitrogen spray; if the seedlings are weak, they should be mainly nitrogen and phosphorus mixed; if the seedlings are in general, they should be sprayed with phosphorus and potassium. .
　　 2. Scientific selection of fertilizer varieties: select varieties suitable for foliar spray fertilizer, such as urea, potassium dihydrogen phosphate, borax, zinc sulfate and so on. And some volatile, insoluble, chlorine ions are not suitable for fertilizer spraying, such as ammonium chloride, ammonium bicarbonate, calcium magnesium phosphate and the like.
　　 3. The spraying concentration should be appropriate: the external top dressing should be determined according to the type of fertilizer, such as urea 1% - 3% , potassium dihydrogen phosphate 0.3% - 0.5% , borax 0.1% - 0.2% , sulfuric acid Zinc 0.2% - 0.3% , ammonium molybdate 0.03% - 0.05% , superphosphate lime leachate 2% - 3% , ammonium sulfate 0.2% - 0.3% .
　　 4. The amount of spray liquid should be sufficient: the specific dosage should be determined according to the type of crop and its different growth period. The general requirement is that the fertilizer should flow down from the foliage, but it is not shed. Usually the liquid amount of fertilizer per 15 ha 50 --70 kg while the whole growth period ejection 3--5 times, separated by time 7--10 days.
　　 5. The spraying site should be proper: the absorption capacity of the leaves, the new leaves are stronger than the old leaves. Monocotyledonous plants such as rice, wheat and other foliar and leaf stomata are similar, and the leaf surface is easy to stick to the fertilizer. It should be the front of the sprayed leaf; the dicotyledonous plants such as melon, soybean, cotton and other leaves have more stomata. the leaf surface, and the spongy tissue of the dorsal fat absorption ability, the leaves should be sprayed into the front and back.
　　 6. It is necessary to spray in the critical period when the crop needs fertilizer: different crops have different fertilizer requirements for various fertilizers, so they should be flexible. For example, rice and wheat should be sprayed after the heading; soybeans, peanuts and rapeseed should be sprayed separately at the initial flowering and full flowering stages; corn and sorghum should be sprayed during the filling stage; sweet potato and potato should be sprayed during the fruit expansion period.
　　 7. It is necessary to choose the time of spraying: it is better to carry out the top dressing in the damp weather. Sunny days should be sprayed before 10 am or after 4 pm, and cloudy weather can be sprayed all day.
　　 8. Spray a multi-effect: the two or more pesticides and fertilizers can be mixed with spraying effect of improving fat-saving medicine, it should be noted that mixing, and not the acidic and basic fertilizer prone antagonism Mixed with pesticides.
　　 9. Fertilizer spraying should be even and thoughtful: most of the fertilizers exist in solid form, and should be fully stirred during application to completely dissolve them. Spray should be even and thoughtful, do not leak, and can not be repeated, so as not to cause fat damage. If the macula and the focal point appear on the leaf surface, it will affect the normal growth of the crop.
　　 10. Adding active agent: Adding neutral active agent (such as neutral soap and washing powder) to the fertilizer can reduce the surface tension of the fertilizer liquid, which is beneficial to the spreading and deepening of the fertilizer liquid and improve the spraying effect.
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A typical version of an overhead garage door used in the past would have been built as a one-piece panel.The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism. Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers. The door is balanced by either a torsion spring system or a pair of extension springs.A remote controlled motorized mechanism for opening garage doors adds convenience, safety, and security
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