How to judge "fat harm" is caused by quality problems?

  Does the crop burn seedlings, burn roots, or is it not fertilizer or improper? After many “fat-harm” disputes occurred, dealers and farmers reported that some manufacturers often used “unsuitable use” to take responsibility for it. Farmers and distributors often could not get strong evidence and encountered such problems. do? Experts said that the detection of three factors can be:

  One is to check whether the content of biuret in the fertilizer exceeds the standard, if the biuret is exceeded, it will cause burning of seedlings and burning of roots. The biuret is derived from urea. Quinified urea has a biuret content that meets the standard and does not produce “fat harm.” When the compound fertilizer nitrogen nutrient source is used for secondary processing, if the process is not performed properly at high temperatures, Biuret will be regenerated, resulting in "fatigue". In particular, there have been some new compound fertilizer granulation technologies, such as high-melt spray granulation, drum spray granulation, and other processes. If not properly controlled, biuret can easily be exceeded.

  The second is that heavy metal pollution is also one of the important causes of plant burning seedlings and burning roots. At present, high-concentration compound fertilizers circulating on the market are less likely to be contaminated with heavy metals, while low-concentration compound fertilizers are more likely to be contaminated. However, in recent years, some manufacturers have added some trace elements in compound fertilizers to diversify marketing and manufacturing product selling points, which may lead to heavy metals. In addition, in high-concentration compound fertilizers, the use of unqualified and unqualified potassium fertilizers as raw materials may also cause excessive heavy metals. In order to respond to market competition, some compound fertilizer companies may also add hidden components to products so that they can achieve better results and market feedback. These recessive components may have positive effects in some soils. In other circumstances it is likely to cause "fat harm."

  The third is to detect whether the chloride ion exceeds the standard. On the one hand, chlorine-free crops that use chlorine-containing fertilizer will undoubtedly produce “fat harm”; on the other hand, even if it is not a chlorine-tolerant crop, if the chloride ion concentration is too high, it will also cause salt damage. , causing burning seedlings, burning roots and other issues. The "fat harm" 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 will easily cause salt damage when applied to the soil, especially for the double chlorine type compound fertilizer (referring to compound Fertilizer raw materials come from ammonium chloride and potassium chloride. This problem is particularly acute. At present, such damage is more frequent in arid regions north of the Huaihe River.