Many people involved in the fertilizer industry must remember the United States' diammonium in the 1980s and 1990s. This was once considered by farmers as a “magic pill†for high grain yield. Domestic fertilizer manufacturers have not been able to produce diammonium of the same quality as foreign brands, and many diammonium manufacturers have begun to use brown dyes. The rise of fertilizer dyes in China stems from this brown “magicâ€. Later, China's fertilizer production began to use dyeing, compound fertilizer, urea can not escape the temptation, water-soluble fertilizers, controlled-release fertilizers, coated fertilizers and other new fertilizers are also covered with a layer of colored coat.
A, what kind of coloring agent
In general, fertilizer dyes have the following types: 1. Water-soluble dyes, pigments, or oil-soluble colorants. 2. Naturally colored substances such as humic acids, certain polysaccharides. 3. Inorganic pigments, such as iron oxide series pigments.
Taking sunset yellow, a food additive approved for use in China, as an example, according to the “Hygienic Standards for the Use of Food Additives†(GB2760), it is applicable to color drinks for fruit drinks, carbonated drinks, sweets, and cakes. The maximum allowable dosage is 0.1 g/kg. , which is the amount of 0.1 ‰ added. Syrup is used for jams, fruit sauces, and mayonnaise and salad dressings. The maximum allowable amount is 0.5 g/kg, which is 0.5 ‰.
According to a senior person in the fertilizer industry, the amount of pigment added to water-soluble fertilizers is generally around 0.4‰, which is less than the allowable amount of salad dressings directly consumed by humans.
B. Does chemical fertilizer stain soil?
It is true that chemical fertilizer companies have used fertilizers such as pyridine, quinone, and disazo, to dye fertilizers, but this happened 10 years ago. Now companies are rarely used because of various factors such as cost.
So, is the iron oxide pigment, one of the chemical products, polluting the soil? First of all, as a dyeing agent, the amount of iron oxide is very small; secondly, iron oxide is not a heavy metal, non-toxic, it can supplement the iron elements that are lost in the soil. Therefore, iron oxide-based dyes do not pollute the soil.
The state encourages the development of water-soluble fertilizers. Most companies add water-soluble pigments, and some companies use food-grade pigments such as lemon yellow, indigo, apple green, and carmine.
C. Why do we add dye to chemical fertilizers?
Taking water-soluble fertilizers as an example: First, many manufacturing companies design different formulations into different colors, allowing farmers to identify fertilizers quickly through color, and reasonably correspond to fertilizer formulations that each crop should use at different growth stages. Second, the concentration of fertilizer can't be seen directly after diluting the fertilizer without dyeing. This often misleads the farmers. With the dyed fertilizer, farmers can easily judge the concentration of fertilizer by the depth of color after dilution. Third, many fertilizer manufacturers add very few trace elements or additives to fertilizers. They need to determine the appearance of the fertilizer to determine whether the mixing effect of the fertilizer has reached an ideal state.
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