1. Check whether the biuret content in the fertilizer exceeds the standard
Biuret is derived from urea. When secondary processing of the nitrogen nutrient source of compound fertilizers, if the process is improperly operated at high temperature, biuret will be regenerated, which will cause burning seedlings and roots. As a result, "fat damage" occurs.
2. Heavy metal pollution is also an important cause of burning seedlings and roots of plants
High-concentration compound fertilizers circulating on the market are less likely to have heavy metal pollution, and low-concentration compound fertilizers are more likely to have heavy metal pollution. In high-concentration compound fertilizers, if potassium fertilizers of unknown origin and unqualified quality are used as raw materials, heavy metals may also exceed the standard.
3. Check whether the chloride ion exceeds the standard
On the one hand, if the chlorine-containing crops use chlorine-containing fertilizers, there will be no doubt that "fertilization" will occur; on the other hand, even if the chlorine-free crops are too high, if the chloride ion concentration is too high, salt damage will also occur, which will cause burning seedlings, burning roots, etc. problem. The "fat damage" caused by excessive chloride ion is closely related to soil and climate. If the weather is dry and the soil moisture is low, a large amount of chemical fertilizers are prone to salt damage after being applied to the soil, especially for the double-chlorine compound fertilizer.
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