When farmers choose water-soluble fertilizers, they often do not know the pros and cons of water-soluble fertilizers. Unqualified water-soluble fertilizers are not only harmful to agricultural production, but also cause environmental pollution and even bring greater losses. Therefore, how to distinguish between true and false water-soluble fertilizers and the purchase of water-soluble fertilizers with reasonable quality is a common concern of farmers. On this issue, a reporter recently interviewed Song Shuling, director of the soil and fertilizer station of Zibo City Agricultural Technology Promotion Center.
What to choose for fat
At present, the water-soluble fertilizers sold on the market mainly include: a large number of elemental water-soluble fertilizers, trace element water-soluble fertilizers, medium-quantity water-soluble fertilizers, humic acid-soluble fertilizers, Amino Acid-soluble fertilizers, and organic water-soluble fertilizers.
First, look at the package logo. Many products, without opening the package, can be seen from the logo to see if it is a regular product. For example, a large amount of elemental water-soluble fertilizer, one depends on the content of a large number of elements and trace elements in 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 6%, and the sum of the three should not be lower than 50%. If a large number of elements are seen on the package, the label is less than 6%. The sum of the three elements is less than 50%, indicating that such products are unqualified. The trace element content refers to the sum of the contents of copper, iron, manganese, zinc, boron and molybdenum. The product should contain at least two trace elements with a content of 0.5%-3.0%.
The second is to look at product formulations and register crops. Water-soluble fertilizers are registered according to the test crops. They can be one or several crops. They should be purchased carefully for unregistered crops or borrowed from previous experience.
Third, we must see whether there are product implementation standards, product generic names and fertilizer registration certificates. Most of the water-soluble fertilizers are implemented in the Ministry of Agriculture industry standard, that is, the beginning of NY; the common name is the above; the fertilizer registration certificate number, the water-soluble fertilizer are registered in the Ministry of Agriculture, and the registration certificate number is: agricultural fertilizer (****) Pro ( Quasi) word ****. If the farmer has doubts about the product, he can check the fertilizer registration number on the Internet.
Fourth, it is necessary to see whether the heavy metal content is marked on the packaging bag. The heavy metal content of water-soluble fertilizers produced by regular manufacturers should meet the national standards and be clearly marked. If the fertilizer packaging bag is not marked with heavy metal content, please use it with caution.
In addition, the fertilizer can be dissolved in water. More than 95% of the qualified water-soluble fertilizer should be dissolved in water, the solution is clear and there is no residue or sediment, otherwise the quality of the fertilizer is not good.
Finally, the solid fertilizer looks uniform, and the liquid fertilizer sees whether the color is consistent or not.
Buy fat five "attention"
Precautions for purchasing water soluble fertilizer:
First, we must choose formal enterprise products and purchase them at the sales offices of legitimate enterprises or legal distribution units. Second, the signs on the packaging bag should be marked with the name of the fertilizer, nutrient content, implementation standards, fertilizer registration certificate, net weight, name of the manufacturer, and contact number of the factory. If the above logo is not or incomplete, it may be a counterfeit product. Third, the fertilizer product label should be clearly defined, and words with untrue or exaggerated nature, such as “Fat King†and “All Elementsâ€, are not allowed. Fourth, attention should be paid to retaining the certificate of purchasing fertilizer. The name, quantity, nutrient content and price of the purchased fertilizer should be indicated in the ticket. If the distribution unit refuses to issue a certificate of purchase of fertilizer, the farmer may report it to the agricultural administrative law enforcement department or the industrial and commercial administration department. Fifth, if the amount of fertilizer is large, it is best to leave a bag of unopened samples as a sample to prevent quality problems.
Fertilizing four roads
Precautions for applying water-soluble fertilizers:
First, a small amount of multiple applications can improve the utilization of water-soluble fertilizers. If it is applied, it is generally about 10 kg per mu/time of fertilizer, and if it is sprayed, it is usually diluted 500-800 times. Second, water-soluble fertilizers are generally applied as top dressings. The appropriate amount and amount of water-soluble fertilizers should be selected according to the amount of base fertilizer and crop growth. The third is the powdery water-soluble fertilizer that has not been used up after opening. It should be tightly stored to prevent moisture; liquid fertilizer should also be sealed and stored to prevent the fertilizer from lowering. The fourth is stored in a normal temperature, cool, dry place. If the water-soluble fertilizer has no agglomeration, it will not affect the fertilizer efficiency. If the liquid fertilizer has sediment, it should be shaken and used.
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