According to industry standards, the current market generally has amino acid, humic acid, trace elements, medium elements, a large number of elements and six kinds of liquid fertilizers of organic water soluble fertilizers. Although the types are different, the quality of the resolution is similar, mainly starting from the following aspects: , two, three, four frozen, five tests.
Look at the physical state of the product
Good liquid fertilizer products are clear and transparent, clean and free of impurities. Although the black solution of suspended fertilizers such as amino acids and humic acid is opaque, after inverting, it is observed that there is no sediment at the bottom of the bottle, and there may be a lot of solid insolubles in the bottle of poor quality.
Product weight
According to industry standards, each product has the minimum nutrient content requirement. Each nutrient in liquid fertilizer is expressed in grams per liter, which means the quality of nutrients contained per unit volume. The larger the value, the heavier the same volume of liquid product. The greater the proportion.
Therefore, the specific gravity is an important indicator to measure the quality of liquid fertilizer products. Good products do not necessarily have a large proportion, but the positive content of small proportion is not sufficient. The proportion of qualified amino acids, humic acid and organic water-soluble fertilizer liquid fertilizer is generally above 1.25, that is, the weight of 1 liter liquid fertilizer is above 1.25 kg, and the ratio of large, medium and trace element liquid fertilizer is more than 1.35.
Smell the smell of the product
Good products have no obvious odor, and some products have a slight ammonia smell under weak acid or weak alkaline conditions. There is a strong ammonia smell, the pH is not well mastered, a special fragrance is generally used to cover certain odors, and a pungent odor is generally added to the substance that should not be added.
Freeze to test product stability
Solids are precipitated in the liquid fertilizer solution. Generally, they are separated into two cases. One is to precipitate slowly for a long time, the other is low temperature, the solubility is reduced, and the freezing can test the stability of the product under low temperature conditions. Good products are placed in the refrigerator for 24 hours and will not be layered and crystallized. Those products that are layered and crystallized are usually not selected in the production process and control the production process.
To test the nature of the product, it is not to test the content of nutrients, but to test the properties of the product as far as it can. For example, the pH value of the test paper is used to detect the pH. The high-liquid fertilizer manufacturer may produce strong acid or alkali, which is unsafe for crops. It is difficult to mix with other pesticides. The pH of the products produced by the skilled manufacturers is close. Neutral or weak acid and weakly alkaline.
In the production, potassium dihydrogen phosphate or monoammonium phosphate solution can also be used to test whether "calcium sugar alcohol" contains sugar alcohol, sugar alcohol-containing products, high calcium chelation, no precipitation in the presence of phosphorus solution, crop absorption and movement Fast; test product safety with low dilution factor. Good liquid fertilizer products do not contain hormones. Compared with powders, the conductivity is much lower. Even if the dilution ratio is very low, it is safe. It can be diluted by 100 times, 50 times or even lower. Shi.
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