How to choose soil conditioners?

How to choose soil conditioners? What kind of soil conditioner is good? Netizens with knowledge are also asked to help introduce the frequent cultivation of agricultural land for many years, resulting in a variety of soil problems, such as acid-base imbalance, soil consolidation, reduction of organic matter, and so on, resulting in frequent occurrence of crop diseases and insect pests and reduced yield. as a result, the demand for soil conditioners is increasing day by day. Therefore, the farming network has sorted out the four key points for the selection and purchase of soil conditioning agents, which are listed in detail below for netizens' reference. First, look at the product certificate: because the agricultural material market is full of soil conditioning agents that have not been registered by the Ministry of Agriculture, but most of them apply the registration certificate numbers of microbial fertilizer, organic fertilizer, water-soluble fertilizer and so on. It can not meet the national standards of soil conditioning. The use of this kind of inferior soil conditioner will pollute the soil, aggravate the soil consolidation, and is not conducive to the growth of crops. A truly qualified soil conditioner must have a registration certificate number issued by the State Ministry of Agriculture. Second, look at the appearance of the products: good quality soil conditioners are generally yellow and gray; medium quality soil conditioners are generally white; inferior soil conditioners are brown; red soil conditioners are generally fake. Third, look at the raw materials: there are many kinds of raw materials used in the production of soil conditioning agents, such as potassium feldspar, limestone, gypsum, iron slag, phosphorus slag, fly ash and so on. Among them, potash feldspar is the best raw material for processing soil conditioning agent, and the heavy metal content of black and gray soil conditioning agent made from coal cinder and slag seriously exceeds the standard, which is easy to cause soil poisoning; while the white soil conditioner made of limestone and gypsum has little effect on soil acidity and is easy to cause soil consolidation. Point 4, look at the product technology: at present, the production technology of soil conditioner in China is divided into three kinds: high temperature calcination method, chemical reaction method and mechanical crushing method. At present, high temperature calcination is the most advanced production process in the world. High temperature calcination method-using high quality potash feldspar as raw material, the grinding block is calcined at 1300 ℃, and the primary colors such as silicon, calcium, potassium and magnesium in the ore are released from the crystal lattice structure of the ore and become highly active soil conditioners that can be directly absorbed by crops. Chemical reaction method-using potash feldspar as raw material, through chemical reaction to activate elements such as silicon, calcium and potassium in the ore into soil conditioners that can be absorbed and utilized by plants. Mechanical crushing method-some inferior ores and cinders are directly ground and processed by the grinder. Trace elements such as silicon and calcium still exist in the form of lattice and can not be absorbed and utilized by crops. Method for determination of soil acidity and alkalinity soil improvement scheme