Three ways to judge the cause of "fat damage"
One is to detect whether the biuret content in the fertilizer exceeds the standard. If the biuret exceeds the standard, it will cause the burning of seedlings and roots. Biuret is derived from urea. The biuret content of qualified urea is up to the standard and will not cause "fertilizer damage." However, when the nitrogen nutrient source of compound fertilizer is subjected to secondary processing, under high temperature conditions, if the process is improperly operated, Will regenerate biuret, which leads to "fertilizer damage". In particular, some new compound fertilizer granulation technologies have emerged, such as high-tower melt spray granulation, rotary drum spray granulation and other processes. Improper control can easily cause the biuret to exceed the standard.
The second is that heavy metal pollution is also one of the important reasons for burning seedlings and roots of plants. The high-concentration compound fertilizers currently circulating on the market are less likely to be polluted by heavy metals, while low-concentration compound fertilizers are more likely. However, in recent years, some manufacturers have added some medium and trace elements to compound fertilizers in order to differentiate their marketing and manufacturing product selling points, which may bring heavy metals. In addition, in high-concentration compound fertilizers, if potash fertilizer of unknown origin and unqualified quality is used as a raw material, it is likely to cause heavy metals to exceed the standard. In order to cope with market competition, some compound fertilizer companies may also add hidden ingredients to their products so that the products can achieve better use effects and market feedback. These hidden ingredients may have positive effects in some soils. In other environments, it is likely to cause "fertility damage."
The third is to detect whether the chloride ion exceeds the standard. On the one hand, if chlorine-free crops use chlorine-containing fertilizers, it will undoubtedly cause "fertility damage"; on the other hand, even if the chlorine ion concentration is not too high, it will also cause salt damage, causing burning of seedlings and roots. problem. The "fertilizer damage" caused by excessive chloride ions is closely related to the soil and climate. If the weather is dry and the soil moisture is low, salt damage is prone to occur after a large amount of chemical fertilizers are applied to the soil, especially for dichlorinated compound fertilizers (referring to compound fertilizers). The fertilizer raw materials come from ammonium chloride and potassium chloride), this problem is particularly prominent. At present, such hazards are more common in the arid areas north of the Huai River.
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