Most of the nutrients needed by crops come from the soil. Therefore, the content of soil nutrients is closely related to the growth of crops. This is an important reason why soil nutrients are measured using soil nutrient analyzers. With the increasing regulation of soil management in China, According to the second national soil survey and related standards, the soil nutrient content is divided into the following levels (see the following table). project Organic matter Total nitrogen Fast-acting nitrogen Fast-acting phosphorus Available potassium level content % % PPM PPM (P205) K20 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 0.05~0.75 30~60 3~5 30~50 6 < 0.6 < 0.05 < 30 < 3 < 30 Dichloromethane (DCM) is a multifunctional and powerful chloride solvent known for its high solubility. As a solvent, it is often used for coating removal, metal cleaning and polishing; It can also be used as a processing solvent in the production of drugs, polycarbonate, cellulose ester and photographic film, and as an extraction medium for aerosol propellant and food processing. Other uses include adhesives, cosmetics, plastic processing and foaming. Dichloromethane has many characteristics such as super solubility, low flammability, high cost efficiency, recyclability and rapid evaporation. Therefore, it has long been the preferred solvent for a variety of applications, mainly in polyurethane foam blowing, metal cleaner, adhesive, paint stripper and pharmaceuticals. Methylene Chloride, Dichloromethane,Methylene Chloride Dichloromethane DCM HENAN JINHE INDUSTRY CO.,LTD , https://www.hnchromiumoxidegreen.com
From the table, it can be seen that the soil nutrient grading standards mainly aim at grading organic matter, total nitrogen, available nitrogen, available phosphorus, and available potassium, and each grade requires different content of different ingredients. The soil nutrient analyzer can be used to quickly determine the available nitrogen, available phosphorus, available potassium, organic matter content in soil, plants, chemical fertilizers, biological fertilizers, etc., soil pH, soil salt content, total nitrogen in plants, and Phosphorus, total potassium. Among them, 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 for measuring soil nutrients. Therefore, the application of soil nutrient analyzer in soil nutrient grading can provide important data support for soil nutrient grading.
Therefore, in the actual work, through the soil nutrient determination results, according to the above soil nutrient grading standards, the land to be fertilized can be analyzed to understand the actual status of the current soil, and then to understand the real soil. Fertility, while guiding the scientific application of fertilizers, enhance soil nutrient status.
At present, due to the abuse of chemical fertilizers in China for a long time, serious soil pollution problems have been caused. The effective way to solve this problem is to use a soil nutrient analyzer to conduct analysis and study to understand the current status of the soil, so as to formulate effective improvement measures to effectively improve soil nutrient levels without destroying the soil environment. , For the agricultural yield, quality of agricultural products to provide basic cultivation conditions.
Dichloromethane is a widely used organic solvent, which is slightly soluble in water, easily soluble in ether and ethanol, and volatile at room temperature. It can cause poisoning if used carelessly. Many commonly used reagents contain dichloromethane, such as various paints, coatings, furniture polish and cleaner, hair styling agent, household air cleaner, deodorant, leather shoe polish and cleaner, etc.