How to distinguish between true and false water-soluble fertilizer?

Compared with traditional calcium superphosphate and granulation compound fertilizer, water-soluble fertilizer has obvious advantages. It is a kind of quick-acting fertilizer with good water solubility and no residue. It can be completely dissolved in water and can be directly absorbed and utilized by the roots and leaves of crops. However, there are all kinds of water-soluble fertilizer on the market, and it is impossible to distinguish between true and false, so how to distinguish between true and false water-soluble fertilizer?

Look at the nutrient content of each element on the bag.

According to the standard of water-soluble fertilizer for a large number of elements, the single nutrient content of nitrogen, phosphorus and potassium should not be less than 4%, and the sum of the three elements should not be less than 50%. If you see on the package that one of the elements is marked less than 4%, or the total of nitrogen, phosphorus and potassium is less than 50%, it means that this kind of product is unqualified.

Large amount of elements + trace elements

The content of trace elements refers to the sum 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 a single trace element with a content of not less than 0.05% shall be included in the content of trace elements, and the content of molybdenum element shall not be higher than 0.5%.

Large number of elements + medium element type

Medium element content refers to the sum of calcium and magnesium element content, the product should contain at least one medium element, the total content of medium element should not be less than 1.0%, and a single medium element with a content of not less than 0.1% shall be included in the content of medium element. Look at the label of all kinds of specific nutrients on the package.

High-quality water-soluble fertilizers with a large number of elements are very clear to ensure that the ingredients (including a large number of elements, medium elements, trace elements) are clearly marked, so that the nutrient content is clear, and people can rest assured when they use it. The nutrient content of informal manufacturers usually appears as the sum of nitrogen, phosphorus and potassium ≥ per cent. If it is marked in this way, the product is irregular.

Look at product formulations and registered crops

A large number of element water-soluble fertilizers are a kind of formula fertilizers, and high-quality water-soluble fertilizers generally have several formulations, and suitable formulations can be found from seedling stage to harvest period. if it is clearly written on the package that it is a special fertilizer for so-and-so crops, and 1-2 formulations dominate the world, this kind of practice is not very reliable. Formal fertilizer registered crops are one or more crops, and local experience is required for crops that are not registered.

See if there are any product implementation standards.

What needs to be explained here is that what we usually call fully water-soluble fertilizer for irrigation and drip irrigation, in fact, the general name of its product is water-soluble fertilizer with a large number of elements, and the general implementation standard is NY1107-2010. If what appears on the package is not this standard, it means that it is not a large number of element water-soluble fertilizer.

The standard marked on the packaging of a large number of element water-soluble fertilizers begins with GB, indicating that such products are not up to standard. In addition, it also depends on whether it has a fertilizer registration certificate number. if vegetable farmers have doubts about their products, they can check their fertilizer registration certificate number on the Internet, qualified water-soluble fertilizers with a large number of elements, fertilizer registration certificate number and manufacturers can all find it, if not, it means that the product is unqualified.

If you look at the inspection report or certificate, all water-soluble fertilizers produced by regular manufacturers should have an inspection report or certificate in the packing box to clearly inform consumers of the product quality test results of this batch of fertilizer.

To see if the heavy metal content is marked or not.

The contents of heavy metals and water-insoluble substances in a large number of element water-soluble fertilizers produced by regular manufacturers are lower than the national standards and are clearly marked. If the fertilizer bag is not marked with heavy metal content and water content, it should be used with caution.

Dissolve a little fertilizer with a proper amount of water

High-quality water-soluble fertilizer with a large number of elements can dissolve quickly in water, the solution is clarified and there is no residue and precipitate. if the fertilizer can not be completely dissolved in water, it means that the quality of fertilizer is not very good.

Look at the particles of fertilizer.

The product of high quality water-soluble fertilizer has uniform and crystalline particles (the size of the particles is similar to that of salt particles). If the particle size of water-soluble fertilizer is different, and the large particles are similar to compound fertilizer or urea particle size, it is best not to buy them.

How to distinguish the true and false of imported water-soluble fertilizer

1. Smell, let's not talk about it. Everyone knows that.

2. The appearance must be dyed (red, blue, green), because foreign fertilizers are designed for big farms. If they are colorless, if the farmer does not know, it is possible to add one more time to cause excessive concentration.

3, there are black spots, green spots, etc., those are trace elements, and the distribution is relatively uniform (which is generally not possible in China), mainly due to equipment problems (horizontal and barrel mixing opportunities have a dead angle of about 10%, resulting in uneven mixing. Foreign countries are double spiral cone mixers, and require 30 minutes to mix)

4. Low water content is an open secret. In order to reduce costs, powdered urea will be used in China (some will be crushed directly with particles). This is moisture-absorbing and the lowest. When urea reaches 30%, you can find it sticky with your hands. If you pat it off, it will dye on the hands, but the imported ones will not dye on the hands.

5. if you use it all the time, you will find that a good imported water-soluble fertilizer will be harvested for a longer period of time, just as a person with good living conditions will live a long life. On the other hand, water-soluble fertilizer with hormones will lead to premature senility and more diseases, just like people who have taken drugs.

6. the price has changed. in fact, in many cases, the price is indeed very high, but like imported pesticides, most of the profits are spent on research and development. Water-soluble fertilizer is spent on experiments, such as an imported water-soluble fertilizer I originally came into contact with. They rented 30 mu of land in an experimental base around Wuhan alone, and it took a year to prove that the product was suitable for crops in the region. The first two years will be more expensive, the third year, the price will not be expensive, because the cost is back, they think that the product is already an old product, it should not be too expensive.

Therefore, imported products start to be expensive, but they should not be expensive after three years. As for what I came into contact with, at first it was retail for 15 jin, and then 12 jin, and new varieties were to be released, and sales promotion in some areas was even as low as 10 yuan per jin.

7. The product has characteristics, either the combination of phosphorus and calcium, or the slow release effect, or the addition of promoting ingredients, etc., while the domestic hype is that the content is high (high is useless and cannot be absorbed), hormone is good (no matter how good the drug is, it is also a drug, what kind of lipids are more expensive than compound nitrofen sodium, the effect is secret), soil improvement (more mysterious, but also can release fixed substances in the soil. Do you dare to precipitate and make it ionized?

What imported water-soluble fertilizer and domestic water-soluble fertilizer have in common:

1. The nutrients and contents of imported water-soluble fertilizer are basically the same as those of domestic water-soluble fertilizer. And all of them are quick-acting and water-soluble fertilizers, which can improve the ability of disease resistance, cold resistance, drought resistance and lodging resistance, and prolong the shelf life and storage period of crops.

2. After use, the color of melons and fruits are uniform and bright, and the size is symmetrical, which can promote the early maturity of crops and appear on the market in advance.

3, the way of use is dilution directly sprayed on the page, flushing, drip irrigation and so on.

The differences between imported water soluble fertilizer and domestic water soluble fertilizer are as follows:

1. Prices are different, imported ones are more expensive than domestic ones, because imported water-soluble fertilizers need to charge more in other aspects, such as tariffs, so the sales price is higher. On the other hand, domestic water-soluble fertilizer has no tariff and the cost of compound intermediate link, so it is cheaper than imported water-soluble fertilizer with the same content.

2. In the market, when there is no development of water-soluble fertilizer in our country, imported water-soluble fertilizer does occupy the high-end market of water-soluble fertilizer in our country, but with the continuous development of water-soluble fertilizer technology in our country, quite good achievements and breakthroughs have been made in recent years. Gradually imported water-soluble fertilizer will also be gradually driven out of the market in our country.