During the storage and application of water-soluble fertilizer raw materials, the stability index is more important. For water-soluble fertilizers, the pH, nutrient concentration and nutrient presence of the solution have a great influence on the stability. Taking liquid water-soluble fertilizer as an example, from the selection of raw materials, it is necessary to pay attention to the chemical stability between the mixed materials. Metal elements are relatively stable under acidic conditions, such as trace elements in Ca, Mg, cu, Fe, Mn, etc., which tend to form hydroxide precipitates under alkaline conditions; non-metallic elements are generally stable under alkaline conditions. For example, boron forms boric acid which is not easily hydrolyzed under acidic conditions, resulting in stratification of liquid fertilizer. For some less soluble materials, the temperature has a greater impact on its stability. Although some water-soluble water-soluble fertilizers are in a dissolved state during production, when the external conditions such as temperature change, the nutrient elements are supersaturated and crystallizes; when the ambient temperature is lowered, the suspended liquid fertilizers may also have a viscosity increase. In the case of high and low fluidity, it is not easy to pour the fertilizer during the application. Therefore, when selecting a water-soluble fertilizer raw material, it is necessary to focus not only on the physical and chemical properties of the raw material itself, but also on the co-stability and solubility of various nutrient elements in the solution.
The raw materials for the production of water-soluble fertilizer raw materials usually use elemental fertilizers, compound fertilizers or some additives. The choice of raw materials for production has an important impact on the quality of the product, including the grade of the raw materials, the type of the elements and the content. The solubility of solid water-soluble fertilizers is important, and the same nutrient content does not imply the same product quality. Therefore, in the selection of raw materials, it is necessary to strictly control the selection of raw materials with good quality to produce water-soluble fertilizers, which have the advantages of stable physical and chemical properties and good solubility.
There are many kinds of water-soluble fertilizer raw materials that supply a large number of nutrients, mainly including raw materials for supplying different forms of nitrogen, phosphorus and potassium.
Nitrogen is a component of important organic compounds in plants, such as proteins, nucleic acids, chlorophyll, enzymes, vitamins, alkaloids and some hormones. These substances involve most biochemical reactions such as genetic information transmission, organelle synthesis, photosynthesis and respiration. It plays an important role in crop growth.
The main nitrogen fertilizer forms that can supply nitrogen to crops can be divided into ammonium nitrogen, nitrate nitrogen and amide nitrogen. All three are nutrients with faster absorption rate, and amide nitrogen can be converted into ammonium state through microbial process in soil. Nitrogen or nitrate nitrogen provides nitrogen for crop growth. Water soluble fertilizer raw materials mainly include liquid ammonia, ammonia water, urea, ammonium nitrate and its modified nitrogen source.
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