Rice stresses balanced fertilization
Calcium Fluoride Bi-concave Lenses
Calcium Fluoride 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.
Calcium Fluoride Bi-Concave Lenses,Spherical Aspheric Lens,Glass Slides For Microscope,Plano Concave Lenses Gold Dragon Optics Electronic Technology CO.,Ltd , https://www.golddragon-optics.com
1. The amount of organic fertilizer: The amount of organic fertilizer accounts for about 50% of the total fertilization amount, so it is necessary to re-apply organic fertilizer. The early rice is applied with 1500-2500 kilograms of fresh green manure or 1000-1500 kilograms of manure fertilizer or 60-80 kilograms of commercial organic fertilizer, 200-250 kilograms of dried straw per acre in the late rice, 1000-1500 kilograms of manure fertilizer or 80-100 kilograms of commercial organic fertilizer. .
2, NPK ratio: rice yield 400-500 kg per mu, a total of 10-12 kg of pure nitrogen, phosphorus pentoxide 4.5-5.5 kg, potassium oxide 13-16 kg, nitrogen, phosphorus, potassium ratio 1: 0.4: 1.3.
3, fertilizer variety selection: the selection of high-quality and efficient urea, ammonium bicarbonate, calcium magnesium phosphorus or superphosphate; potassium sulfate or potassium chloride and other single fertilizer or rice special fertilizer, compound fertilizer.
4. Application period:
1) Base fertilizer: Organic fertilizer and phosphate fertilizer are all applied as base fertilizer, and organic fertilizer is applied before tillage. At the time of Putian, 35-40 kg of calcium magnesium phosphate and 15-20 kg of ammonium bicarbonate, 8-10 kg of potassium sulfate or 6-8 kg of potassium chloride are applied per mu.
2) Topdressing: Topdressing should be divided into two applications. The first topdressing should be applied about 7 days after transplanting, 7.5-9 kg of urea per mu, 6-7.5 kg of potassium sulfate or 5-6 kg of potassium chloride; The second top dressing is applied about 15 days after transplanting, 8-10 kg of urea per mu, 10-12 kg of potassium sulfate or 8-10 kg of potassium chloride.
3) Spike fertilizer: the stage of young panicle differentiation (about 25 days after transplanting early rice and 50 days after transplanting late rice), if the color of the leaves turns yellow, it can apply urea 2.5-2.5 kg per acre and 3-4 kg of potassium chloride.
4) Spraying foliar fertilizer: spraying potassium dihydrogen phosphate or rice foliar fertilizer at the booting stage and maturity stage.
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