In recent years, water-soluble fertilizers have quickly occupied the market with the advantages of quick dissolution, easy absorption, and convenient use. With the increasing use of farmers, the identification of true and false water-soluble fertilizers has been put on the agenda. In order to pick out quality products from the many water-soluble fertilizer products on the market, you must also make a fuss from the following aspects. Identify the quality of fully water-soluble fertilizers. First, the packaging must be carefully watched. Many products, without opening the package, can be seen from the package to see if it is a regular product. Especially for a large number of elemental water-soluble fertilizers, there are many ways on the light packaging, reminding farmers that friends must look carefully.
1. Look at the specific nutrient content of a large number of elements, medium-quantity elements and trace elements on the packaging bag.
According to the standard of large-scale water-soluble fertilizers, the single nutrient content of nitrogen, phosphorus and potassium should not be lower than 4%, and the sum of the three should not be less than 50%. If a large amount of elements are seen on the package, the label is less than 4%. , or the sum of the three elements of NPK is less than 50%, indicating that such products are unqualified.
A large number of elements + trace elements:
The trace element content refers to the sum of the contents of copper, iron, manganese, zinc, boron and molybdenum, and the product should contain at least one trace element. The total content of trace elements should not be less than 0.2%, and the single trace elements with a content of not less than 0.05% should be included in the trace element content, and the content of molybdenum should not be higher than 0.5%.
A large number of elements + medium element type:
The content of the medium amount refers to the sum of the content of calcium and magnesium. The product should contain at least one medium element. The total content of the medium element should not be less than 1.0%, and the single medium element with the content not less than 0.1% should be included in the calculation. In the amount of elemental content.
2, look at the labeling of various specific nutrients on the bag
The high-quality large-scale water-soluble fertilizer is very clear on the identification of the ingredients (including a large number of elements, medium-quantity elements, trace elements), and they are all single-labeled, so that the nutrient content is clear, and the people can use it with confidence. The nutrient content of informal manufacturers generally appears with the words ≥ 5% of total NPK content. If so marked, the product is not regular.
3, see product formula and registered crops
A large amount of water-soluble fertilizer is a formula fertilizer. High-quality water-soluble fertilizer generally has several formulas. From the seedling stage to the harvesting period, a suitable formula can be found. If the package clearly states that it is a special fertilizer for a certain crop, 1-2 recipes hit the world, this kind of practice is not very reliable. A formal fertilizer registration crop is one or several crops, and for unregistered crops, there is a need for local experience.
4, see if there are product implementation standards, product generic name and fertilizer registration certificate number
What needs to be explained here is that we usually say that the water-soluble flushing and drip irrigation fertilizers are actually the common name of the product is a large amount of water-soluble fertilizer. The general implementation standard is NY1107-2010. If the standard does not appear on the packaging, , indicating that it is not a large amount of water-soluble fertilizer.
The reporter found that many of the elements marked on the water-soluble fertilizer packaging standards are based on GB, indicating that such products are unqualified. In addition, it depends on whether there is a fertilizer registration certificate number. If the vegetable grower has doubts about the product, you can check the fertilizer registration number on the Internet, the qualified large amount of water-soluble fertilizer, the fertilizer registration certificate number and the manufacturer can find it. Can not find, indicating that the product is unqualified.
5, look at the inspection report or certificate
Generally, the fully water-soluble fertilizer produced by regular manufacturers should have an inspection report or certificate in the package, and clearly inform the consumers of the product quality test results of the batch of fertilizer.
6, see if the packaging bag is marked with heavy metal content and water insoluble matter, etc.
The heavy metal content and water insoluble matter of a large number of elemental water-soluble fertilizers produced by regular manufacturers are lower than the national standards and are clearly marked. If the fertilizer packaging bag is not marked with heavy metal content and water is not contained, it should be used with caution.
7. Dissolve a small amount of fertilizer with a proper amount of water.
High-quality macro-element water-soluble fertilizer can dissolve quickly in water, the solution is clear and there is no residue and sediment. If the fertilizer is not completely dissolved in water, there is residue, indicating that the fertilizer quality is not very good.
8, look at the particles of fertilizer
Good quality water-soluble fertilizer products have uniform particles and are crystalline (the particle size is similar to that of salt particles). If the water-soluble fertilizer fertilizer particle size is different, the large particles are similar to the compound fertilizer or urea particle size, it is best not to buy.
9, look at the flame reaction
If the fertilizer burns with a blue, purple, green flame after burning, the fertilizer quality is good. Conversely, if the burning is intense and a red flame or golden yellow is used, the quality of the fertilizer is poor.
Flame reaction of each metal element: boron-cyan; calcium-brick red; copper-green; iron-colorless; potassium-purple; manganese-yellow-green; molybdenum-yellow-green; sodium-gold yellow; phosphorus-yellow; - blue green; magnesium - colorless.
The same is a large amount of water-soluble fertilizers, why is the price gap so large?
Nowadays, the price difference of a large number of elements of water-soluble fertilizers on the market is large. Some 6,000 yuan can buy 1 ton, while some tons reach 10,000 yuan or even more than 20,000. Why is the price difference so large? This is mainly related to the source of potassium and the level of raw materials used.
First look at the source of potassium:
At present, there are four main potassium sources of water-soluble fertilizers on the market: potassium chloride, potassium sulfate, potassium nitrate, and potassium dihydrogen phosphate. In general, the potassium chloride type fertilizer has the lowest price, followed by the potassium sulfate type, and the best is potassium nitrate and potassium dihydrogen phosphate.
Because potassium sulfate and potassium chloride fertilizers contain a large amount of sulfate ions and chloride ions, long-term application can easily lead to crops lacking medium-level elemental calcium, so it is easy to cause fruit cracking, growth point dysplasia, yellow leaves, and even fruits. Diseases such as umbilical rot occur.
In addition, long-term use of fertilizers containing sulfate ions and chloride ions will greatly reduce the absorption efficiency of nitrate nitrogen, and the soil salt content in the greenhouse will be enriched and the soil will gradually acidify, resulting in soil compaction and not conducive to crop root growth. In the case of a water-soluble fertilizer compounded with potassium nitrate and potassium dihydrogen phosphate, any of these two types can be absorbed and utilized by the crop, and the above symptoms such as salt accumulation do not occur, and the corresponding price is also the highest.
The second is to use the level of raw materials:
High quality water soluble fertilizers are generally produced using food grade and industrial grade raw materials. Industrial grade raw materials are thousands or even thousands of yuan higher than agricultural grade raw materials, and are superior to agricultural grade raw materials in terms of fertilizer nutrient content, water solubility, absorption efficiency, heavy metal content, and product stability.
Many bad water-soluble fertilizers are produced using agricultural grade raw materials at low prices and quality is difficult to guarantee. More unscrupulous manufacturers use the whole water to make a fuss, using pure magnesium sulfate, ammonium chloride and other raw materials as water soluble fertilizer to extract huge profits.
In water-soluble fertilizers, the source of phosphorus is very important, and it is also related to the price of fertilizer, which is why the price of potassium nitrate is also much lower than that of a large amount of elemental water-soluble fertilizer.
Finally, from the recipe:
According to the technical advantages of each manufacturer, good water-soluble fertilizers will increase the combination of additives, such as anti-caking agents, dissolution promoters (to prevent drip irrigation facilities), surfactants, etc., to prepare water-soluble fertilizers, the purpose It is to further improve fertilizer utilization and increase crop yield and quality.
However, many unscrupulous merchants add hormones and other substances to water-soluble fertilizers, and pursue short-term effects. The ultimate victims are farmers. For this reason, high-quality water-soluble fertilizers generally do not have obvious ammonia smell and pungent hormone taste. A point is very important.
At present, a large number of elemental water-soluble fertilizers also have a production process in which all kinds of nutrients are dissolved in water and then crystallized, which can basically ensure that each fertilizer contains a variety of nutrients, uniform particles, uniform size, water-soluble Very good sex. (Article source: Hot Agricultural Investment Merchants Network)
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