According to the second national soil survey and related standards, the soil nutrient content is divided into the following levels (see the following table). Table 1 Soil nutrient grading standards project Organic matter % Total nitrogen % Fast-acting nitrogen PPM Fast-acting phosphorus PPM (P2O5) Available potassium K2O level content 1 >4 >0.2 >150 >40 >200 2 3~4 0.15~0.2 120~150 20~40 150~200 3 2~3 0.1~0.15 90~120 10~20 100~150 4 1~2 0.07~0.1 60~90 5~10 50~100 5 0.6~1 0.05~.075 30~60 3~5 30~50 6 <0.6 <0.05 <30 <3 <30 The soil nutrient grading standards are mainly used to classify the contents of organic matter, total nitrogen, available nitrogen, available phosphorus, and available potassium, and the content of different components is different for each grade. In actual work, we can compare or reference this standard and test and analyze the land to be fertilized to understand the real fertility of the soil. Soil nutrients refer to the essential nutrients that are present in the soil. Including carbon (C), nitrogen (N), oxygen (O), hydrogen (H), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulfur (S), iron (Fe) Mn, Mo, Zn, Cu, B, and Cl are 16 types. In the natural soil, in addition to the first three, the soil nutrients mainly come from the soil minerals and soil organic matter, followed by atmospheric precipitation, slope seepage and groundwater. Organic matter is a symbolic substance of soil fertility. It is rich in nutrients needed by plants and regulates soil physical and chemical properties. It is an important indicator of soil nutrients. It is mainly derived from organic fertilizers and plant roots, stems, branches, leaves of corruption and various microorganisms, etc. The basic components are mainly cellulose, lignin, starch, sugars, oils and proteins, etc., providing a wealth of plants C, H, O, S, and trace elements can be directly absorbed and utilized by plants. The classification of organic matter can be used as soil nutrient grading. The soil nutrient grading standard is a total of six grades, and the sixth grade is the lowest, and the first grade is the highest. Precipitated Calcium Carbonate
Uses: Can be used as filler in rubber, plastics, paper, paint and ink industries. Widely used in organic synthesis, metallurgy, glass and asbestos production. It can also be used as a medium seeding agent for industrial waste water, a antacid for stomach and duodenal ulcers, a detoxifying agent for acidosis, a SOâ‚‚ eliminating agent in SOâ‚‚-containing exhaust gas, a dairy cattle feed additive and an anti-sticking agent for oil felt . It can also be used as a raw material for tooth powder, toothpaste and other cosmetics.
Usually used as a filler, widely used in daily chemical industries such as artificial floor tiles, rubber, plastics, papermaking, coatings, paints, inks, cables, construction supplies, food, medicine, textiles, feed, toothpaste, etc., as a filler to increase products The volume is reduced, and the production cost is reduced. Precipitated Calcium Carbonate,Precipitate Calcium Carbonated Powder,Precipitated Calcium Carbonate Manufacturers,Activated Precipitated Calcium Carbonate Henan Shunbang Chemical Industry CO.,Ltd , https://www.sblubricant.com
Light Calcium Carbonate is made of limestone, and can be used in daily chemical products such as tooth powder, toothpaste, cosmetics, etc. It can also be used in organic synthesis, metallurgy, glass and asbestos production.
The particle size of light calcium is smaller than that of Heavy Calcium Carbonate, the oil absorption is larger than that of heavy calcium carbonate, and the price is higher than that of heavy calcium carbonate. They are all commonly used fillers in latex paint, and they are best used together. Light calcium is better in terms of sedimentation, but its oil absorption is greater than that of heavy calcium, and the price is generally more expensive than heavy calcium. Although it is not as stable as heavy calcium, it is stable. Even for exterior wall paint, its application amount is also very large. of.
Soil nutrient classification standard