The first is to check whether the biuret content in the fertilizer exceeds the standard. If the biuret exceeds the standard, it will cause seedling burning and root burning. Biuret is derived from urea. Qualified urea has a biuret content that meets the standard and will not cause "fertilization." When the nitrogen source of the compound fertilizer is subjected to secondary processing at high temperature, if the process is not performed properly, Biuret is re-produced, leading to "fatness". In particular, some new compound fertilizer granulation technologies have appeared at present, such as high-tower melt spray granulation, drum spray granulation and other processes. If improperly controlled, biuret may easily exceed the standard.
Second, heavy metal pollution is also one of the important reasons for plant burning and root burning. At present, high-concentration compound fertilizers circulating on the market are less likely to have heavy metal pollution, while low-concentration compound fertilizers are more likely. However, in recent years, some manufacturers will add some trace elements to the compound fertilizer in order to differentiate the marketing and manufacture the product selling point, which may bring heavy metals. In addition, in high-concentration compound fertilizers, if potassium fertilizers of unknown origin and unqualified quality are used as raw materials, it is likely to cause heavy metals to exceed standards. 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 results and market feedback. These hidden ingredients may have positive effects in some soils, and In other environments it is likely to cause "fatness".
The third is to check whether the chloride ion exceeds the standard. On the one hand, if chlorine-containing fertilizers are used in chlorinated crops, there is no doubt that they will cause "fertilization"; on the other hand, even if they are not chlorinated crops, if the chloride ion concentration is too high, they will also cause salt damage, which will cause seedling burning and root burning. problem. The "fertilization" caused by excessive chloride ions is closely related to the soil and climate. If the weather is dry and soil moisture is low, a large amount of chemical fertilizers are likely to cause salt damage after being applied to the soil, especially for double-chloride compound fertilizers (referring to compound Fertilizer raw materials come from ammonium chloride and potassium chloride), this problem is particularly prominent. At present, such hazards occur more frequently in arid areas north of the Huaihe River.
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