Fertilizer for dyeing

Presumably, many people in the fertilizer industry remember the American diammonium in the 1980s and 1990s, which was once regarded by farmers as a "magic pill" for high-yield food. Domestic fertilizer practitioners are unable to produce diammonium of the same quality as foreign brands, and many diammonium manufacturers have begun to use brown dyes. The rise of fertilizer stains in China stems from this brown "magic power."

Later, China's fertilizer production began to use dyeing agents, compound fertilizers, urea can not escape the temptation, water-soluble fertilizer, controlled release fertilizer, coated fertilizer and other new fertilizers have also been put on a layer of colored outerwear.

1 Type of dye

In general, fertilizer dyes have the following products: 1. water-soluble dyes, pigments or oil-soluble color enamel; 2. natural colored substances, such as humic acid, certain polysaccharides; 3. inorganic pigments Such as iron oxide series pigments.

Is it a poison that is added with dyes or pigments?

Dyes have a variety of uses in industrial, food and agricultural production, such as dyeing cloth, inks, paints, and the like. In addition, food grade lemon yellow is often used to blend orange juice, and carmine is also used to dye wine. According to relevant laws and regulations, industry standards, whether it is dye or pigment, as long as it is added within the allowable range, it is possible. If the dye-added fertilizer is toxic, it is almost equivalent to characterizing that the kitchen knife is a weapon.

2 What is the amount of dye added to the fertilizer?

Is the dye added to the fertilizer more or less than the dose in the food? Taking the food additive sunset yellow approved by China as an example, according to the "Sanitary Standards for the Use of Food Additives" (GB2760), it is used for coloring beverages, carbonated drinks, confectionery and cakes. The maximum allowable usage is 0.1 g/kg. , that is, the amount of 0.1 添加 added. The syrup is used for jam, fruit seasoning and mayonnaise, salad dressing, and the maximum allowable amount is 0.5 g/kg, that is, the addition amount of 0.5 。.

According to senior producers in the fertilizer industry, the amount of pigment added to water-soluble fertilizers is generally around 0.4‰, which is less than the amount of salad dressing that people can directly consume.

3 Does the fertilizer stain the contaminated soil?

It is true that fertilizer companies have used dyes such as pyridine, enema, and disazo to dye fertilizers, but this happened 10 years ago. Now, because of various factors such as cost, companies have rarely used them.

So, is there any pollution of the soil by iron oxide pigments, one of the chemical products? First, as a coloring agent, the amount of iron oxide is very small; secondly, iron oxide is not a heavy metal, non-toxic, and can replenish iron lost in the soil. Therefore, the iron oxide dye is not polluted to the soil.

The state strongly encourages the development of water-soluble fertilizers. Most enterprises add water-soluble pigments. Some enterprises use food-grade pigments such as lemon yellow, indigo, apple green, and carmine.

4 Why do you need to add a stain in the fertilizer?

Take water-soluble fertilizer as an example: First, many manufacturers design different formulas into different colors, so that farmers can quickly identify the fertilizer through color, and also reasonably correspond to the fertilizer formula that should be used in each crop at different growth stages. Second, the dilution of the undyed fertilizer can not visually see the concentration of the fertilizer, which often misleads the farmers, and the dyed fertilizer, the farmers can easily judge the concentration of the fertilizer through the color depth after dilution. Third, many fertilizer manufacturers add very few trace elements or additives to the fertilizer. They need to determine whether the fertilizer mixture is in an ideal state by the appearance of the fertilizer. In this sense, the addition of pigments is an indicative means of producing high quality fertilizers.

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