Ball lenses Spherical ball lenses are commonly used for laser collimating and focusing, laser-to-fiber coupling, fiber-to-fiber coupling, and fiber-to-detector coupling. Larger spheres are easier to handle and ease the sensitivity of translational alignment. However, smaller spheres fit into smaller packages.
Sapphire and Ruby ball lenses are both made from Al203. Ruby or Ruby-Doped sapphire owes its red color to traces of chromium oxide (chromium content for ruby balls is typically >0.5%). While their physical and chemical properties are basically the same, their optical properties are somewhat different. Sapphire has superior optical transmission qualities. Ruby Balls are easier to see and therefore easier to handle for physical applications.
Ball Lens Half-Ball Lens
Specification of our ball lens: Sapphire Ball Lens,2 Mm Sapphire Ball Lens,Sapphire Half-Ball Lens,Sapphire Glass Ball Lens China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com
Early Shidu Shiji Fertilizer Du Zhihui, a professor at Northwest A&F University, believes that most of the orchards currently have less than 1% organic matter, and some orchards are even below 0.5%, which is far from the requirements of abundance gardens. Therefore, it is necessary to increase the amount of base fertilizer.
Du Zhihui suggested that under the condition of insufficient organic matter, the appropriate pursuit of the available nitrogen fertilizer can significantly improve the photosynthetic performance of the leaves, thereby increasing the accumulation level of photosynthetic products in the tree and playing the role of “nitrogen-increasing carbonâ€. The accumulation of photosynthetic products in turn promotes the growth of roots and improves the absorption capacity of roots. The thin tree is thin and the flower buds are difficult to form, which are related to the carbon and nitrogen metabolism levels of the plants. Therefore, an appropriate increase in the amount of nitrogen fertilizer, nitrogen to increase carbon, nitrogen fertilizer open circuit is an effective measure to form a yield of thin orchard and strong trees.
Nitrogen should be adapted to local conditions. Generally, fertilizers begin to take effect in 10-15 days after spring nitrogen dressing. Generally, summer is 5-7 days, and autumn is between the two. This is mainly due to soil organic matter level and adsorption capacity. After 20 days of general topdressing (high temperature season), the fertilizer effect is not very significant. The organic matter content is low, the soil with poor fertility is poor, the nutrients are dripping with water, the effective period of fertilizer is shorter, and the soil is often denitrified in the rainy season from July to August. Therefore, the topdressing of the mountain sand should be applied in a small amount, so that the nutrient in the water can penetrate into the concentrated distribution layer of the root system. After the rainy season, a small amount of nitrogen fertilizer can be applied to compensate for the leaching loss.
Du Zhihui said that when the pH value is above 7.5, the effective phosphorus content in the soil is generally low, and the fruit trees are often difficult to form flowers due to the lack of phosphorus. (earth application or top dressing) is indispensable for early fruit yield, and the application of phosphate fertilizer in soil is easy to fix. Therefore, it is best to mix it with high-quality organic fertilizer rich in nutrients. It is best to apply the top dressing to the tree tray, immediately slash it gently, mix the fertilizer, and then water it. When the tree is covered with grass, it can be applied directly to the grass and then washed down with water; or the corner of the grass can be sprinkled on the soil surface, then watered and washed, and then the grass can be covered.
Emphasis on the application of medium and trace element fertilizers. Micro-fertilizer refers to fertilizers containing medium and trace elements that affect the growth and development of fruit trees. Although fruit trees require less of these medium and trace elements, these trace elements contribute to the growth and development of fruit trees. The quality of the product has an important impact, therefore, the production of high-quality high-grade fruit is inseparable from the application of these micro-fertilizers. Focus on the application of boron fertilizer, zinc fertilizer, calcium fertilizer and silicon fertilizer. The main role of boron fertilizer and zinc fertilizer is to increase fruit coloration and improve fruit quality. In specific application: First, pay attention to the application of boron fertilizer and zinc fertilizer (into 5-10 cm soil layer) to facilitate root absorption; Second, when the temperature is high, it is beneficial to the absorption of boron fertilizer and zinc fertilizer by the root system, so the application time is preferably from June to August.
The main role of calcium fertilizer is to increase fruit firmness. Application time: First, 2-3 weeks after flowering, spray 0.5%-1% calcium chloride every 5 days for a total of 2-3 times; second, after fruit harvest, use concentration 3% The calcium chloride is soaked for 20 minutes, which can increase the fruit firmness and improve the storability of the fruit. The main function of silicon fertilizer is to enhance the resistance of fruit trees to pests and diseases, improve stress resistance, reduce the fixation of phosphorus in soil, and improve the quality of fruit. Silicon fertilizer can be combined with the application of organic fertilizer.
In addition, according to the growth and development of the tree, timely application of trace element fertilizers such as iron, magnesium and manganese fertilizers to meet the demand for these trace elements. 
*Material:BK7 or other optical glasses,optical crystal materials
*Diameter:1mm - 40mm
*Dimension Tolerance:+/-0.005mm
*Surface Quality:40-20
*Sphericity:0.005mm
*Coating:optional
Fruit tree formula fertilization considerations
Under drought conditions, formula fertilization can make the fertilizers mix properly and, under adverse conditions, play the best fertilization effect.
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