Trace element fertilizers are mainly inorganic salts or oxides, and some mineral, metallurgical by-products or wastes can often be used as raw materials for trace element fertilizers, and their production methods are the same as those of inorganic chemical products. In addition, there are two forms of trace element fertilizers: one is a vitreous substance containing trace nutrients, which is made of the corresponding inorganic salts or oxides co-tectic with silica; The other is chelates of metallic elements, such as copper, iron, manganese, and zinc chelates made with ethylenediaminetetraacetic acid (EDTA). This kind of chelated trace element fertilizer has a good effect and quick effect, but the cost is very high and has not been widely adopted.
There are two types of micronutrient fertilizer application methods: soil application and foliar spray application. Because the application rate per unit area is very small, it must be diluted with a large amount of inert substance before application, and some crops will be poisoned when applied unevenly.
Trace element fertilizers often need to be mixed with constant fertilizers and applied together. The following is usually used
A few ways:
1. Mixed in the production of constant granular fertilizer. This method is more convenient and economical, and will not produce uneven nutrients, but the disadvantage is that the flexibility is poor, and it is difficult to meet the multiple requirements of the market.
2. Coat the trace element fertilizer powder on the surface of the macro-granular fertilizer. This operation can be carried out in the secondary processing plant and can be prepared to meet the needs of the market at any time. Macrogranular fertilizer and trace element fertilizer are mixed in a small mixer for about 1min, and then a small amount of oil, water or trace element salts are sprayed into the aqueous solution, and continue to mix, the product still maintains a dry appearance.
