　　 1. Fertilization of solanaceous vegetables, nitrogen, phosphorus and potassium, mainly based on nitrogen fertilizer, should be applied several times;
　　 2 , melon fertilization, nitrogen, phosphorus, potassium and heavy, emphasis on the application of decomposed ring manure, cake fertilizer and other organic fertilizer;
　　 3 , fertilization of bean vegetables, nitrogen, phosphorus, potassium, less nitrogen fertilizer;
　　 4 , leafy fertilization is mainly nitrogen fertilizer, phosphorus and potassium;
　　 5 , root vegetables fertilization, nitrogen, phosphorus, potassium, pay attention to the application of potassium fertilizer;
　　 6 〠Onion and garlic fertilization is mainly based on nitrogen fertilizer, phosphorus and potassium are combined, and special attention is paid to applying organic fertilizer such as decomposed ring manure;
　　 7. Fertilization of yam should be applied in large quantities to decomposed ring manure and potash fertilizer, together with nitrogen and phosphate fertilizers;
　　 8. Fertilization of perennial vegetables should pay attention to the application of organic fertilizers such as fermented round fertilizer and soil fertilizer, and the application of nitrogen, phosphorus and potassium in topdressing.
Zinc Selenide Bi-concave Lenses
Zinc Selenide Bi-concave Lenses,biconcave lenses,bi concave lens,bi-concave lenses
Our company can produce many kinds of flat convex Spherical Mirrors with different sizes, radii and base materials, flat convex spherical Mirrors, flat concave spherical mirrors, double convex spherical mirrors, double concave spherical mirrors, meniscus spherical mirrors and other ordinary spherical mirrors. Special spherical mirror can also be processed, such as: achromatic spherical mirror, aspheric surface and spherical mirror group.
Materials: optical glasses such as flint glass, ultraviolet fused quartz and infrared fused quartz, as well as optical crystal materials such as calcium fluoride (CaF2), germanium (Ge), Zinc selenide (ZnSe) and silicon (Si)
Focal length: ±5mm -- ±1000mm±1%
(Germany TIROPTICS OPTOMATIC2000 test)
Outer circle: 4mm -- 200mm±0.1mm
Center thickness tolerance: ±0.1mm
Center deviation: 3-5 points
Surface accuracy: /2@
Surface quality: 40/20
Effective diameter: 90%
Plating film: according to customer requirements can be coated
In addition, we have more than a thousand kinds of standard products, and some of the standard products in stock to meet your needs
Zinc Selenide Bi-Concave Lenses,Bright Field Microscope,Breadboard Optical,Zinc Selenide Lens
Gold Dragon Optics Electronic Technology CO.,Ltd , https://www.golddragon-optics.com