1. Fertility requirements: Chinese cabbage has a long growth period, high yield, and a great demand for nutrients. The absorption of potassium is the highest, followed by nitrogen, calcium, phosphorus and magnesium. The total demand for fertilizer is characterized by less nutrient absorption during the seedling stage, a significant increase in the rosette period, and absorption of nutrients at the heart-packing stage. Adequate nitrogen nutrition is particularly important to promote the formation of hypertrophic green leaves and increase photosynthetic efficiency. If the supply of phosphorus and potassium is insufficient in the later period, it is often difficult to make the ball. 2. Fertilization technology: The fertilization amount per mu for the whole growing period under medium fertility level is 2000-2500 kg (or 300-350 kg for commercial organic fertilizer) for the whole growing period, 13-16 kg for nitrogen fertilizer, 5-8 kg for phosphate fertilizer, and 10-12 for potash fertilizer. Kilograms, nitrogen and potassium fertilizers are used as base fertilizers and secondary fertilizers. Phosphate fertilizers are all used as base fertilizers, fertilizers and farmyard fertilizers (or commercial organic fertilizers). Basal fertilizer: 2000 to 2500 kg of farmyard fertilizer or 300 to 350 kg of commodity organic fertilizer, 4 to 5 kg of urea, 11 to 17 kg of diammonium phosphate, 6 to 7 kg of potassium sulfate, and 20 kg of calcium nitrate. Dressing: Mushi urea 10 to 12 kg in the lotus stage, 7 to 9 kg of potassium sulfate; Mushi urea 10 to 12 kg in the early stage of the core, potassium sulfate 7 to 9 kg. Fertilizers outside the root: spraying 0.3% calcium chloride solution or 0.25% to 0.50% calcium nitrate solution during the growth period can reduce the incidence of dry heartburn. Spraying 0.5% to 1.0% urea or 0.2% potassium dihydrogen phosphate solution at the beginning of the ball can improve the commercial value of Chinese cabbage. Titanium Dioxide(TIO2)
Titanium dioxide is an important inorganic chemical pigment, the main component is titanium dioxide. The production process of titanium dioxide has two process routes: sulfuric acid method and chloride method. It has important applications in coatings, inks, papermaking, plastics and rubber, chemical fiber, ceramics and other industries.
It has two types: rutile type (Rutile R type) and anatase type (Anatase A type). The rutile crystal structure is compact, relatively stable, and has low optical activity, so it has good weather resistance, and has high hiding power and decolorizing power.
Titanium dioxide is widely used in coatings, plastics, rubber, ink, paper, chemical fiber, ceramics, daily chemicals, medicine, food and other industries. Titanium Dioxide,Tio2 Titanium Dioxide,Titanium Dioxide Tio2,Titanium Dioxide Rutile Tio2 Henan Shunbang Chemical Industry CO.,Ltd , https://www.pvcresinchem.com
The coating industry is the largest user of titanium dioxide, especially Rutile Titanium Dioxide, most of which is consumed by the coating industry. The paint made of titanium dioxide has bright colors, high hiding power, strong tinting power, low dosage, and many varieties. It can protect the stability of the medium, and can enhance the mechanical strength and adhesion of the paint film to prevent cracks. Prevent the penetration of ultraviolet rays and moisture, and extend the life of the paint film.
The plastics industry is the second largest user. Adding titanium dioxide to plastics can improve the heat resistance, light resistance, and weather resistance of plastic products, improve the physical and chemical properties of plastic products, enhance the mechanical strength of the products, and extend the service life.
The paper industry is the third largest user of titanium dioxide. As a paper filler, it is mainly used in high-grade paper and thin paper. Adding titanium dioxide to the paper can make the paper have better whiteness, good gloss, high strength, thin and smooth, no penetration during printing, and light weight. Titanium dioxide for papermaking generally uses Anatase Titanium Dioxide without surface treatment, which can act as a fluorescent whitening agent and increase the whiteness of paper. However, laminated paper requires the use of surface-treated rutile titanium dioxide to meet the requirements of light resistance and heat resistance.
Titanium dioxide is also an indispensable white pigment in advanced inks. The ink containing titanium dioxide is durable and does not change color, has good surface wettability and is easy to disperse. The titanium dioxide used in the ink industry has rutile type and anatase type.
The textile and chemical fiber industry is another important application field of titanium dioxide. Titanium dioxide for chemical fiber is mainly used as a matting agent. Since the anatase type is softer than the gold red type, the anatase type is generally used. Titanium dioxide for chemical fiber generally does not require surface treatment, but in order to reduce the photochemical effect of titanium dioxide and prevent the fiber from degrading under the action of titanium dioxide photocatalysis, surface treatment is required for some special varieties.
The enamel industry is an important application field of titanium dioxide. The enamel grade titanium dioxide has high purity, good whiteness, fresh color, uniform particle size, strong refractive index and high color reducing power, and has strong turbidity and Opacity, make the coating thin, smooth and strong acid resistance after enamelling. It can be evenly mixed with other materials in the enamel manufacturing process, does not agglomerate, and is easy to melt.
The ceramic industry is also an important application field of titanium dioxide. Ceramic grade titanium dioxide has high purity, uniform particle size, high refractive index, excellent high temperature resistance, and does not change ash at 1200°C for 1 hour. High opacity, thin coating, light weight, widely used in ceramics, construction, decoration and other materials.