What are the reasons why compound fertilizer doesn’t dissolve in the soil?

No one has answered... Maybe everyone hasn’t encountered this issue yet. I can only think of the customers now... Could it be that the rainfall is less, so there’s less water? As a result, the samples brought back by the sales staff don’t melt much when placed at home... Storing them isn’t a problem... But... could it be an issue with the anti-caking agents? Is there any manufacturer that specializes in such agents? Could you tell me about the effects of the components of these anti-caking agents on the nature of fertilizers?

1. Where is it used? Arid regions become arid slowly. 2. It could also be caused by an anti-caking agent. 3. Is it an encapsulated slow-release fertilizer? 4. The sulfur-based slurry granulation produced by our factory is of high quality, and it is sold throughout the country. However, the process is slower in the Northeast region.

No. It’s urea spray granulation, as opposed to conventional granulation methods. Do you know anything about anti-caking agents? Which factor plays the main role in determining the effect of anti-caking agents on preventing dissolution and caking? There are too many small factories like this, making it difficult to select products of good quality. There is very little information available on this topic.

It’s not caused by the anti-caking agent. The formula is the same; it’s just that the total amount of the liquid phase is fixed. It’s likely that the reaction temperature is too high. The distribution of the liquid phase volume (phosphoric acid and sulfuric acid) in the reactor and washing system is improper, with too much ammonia in the reactor.

Sigh. . . It’s not ammoniation granulation. No ammonia. There is no reactor. .

Depending on the process used, residues tend to remain in granular forms; this is likely related to the soil conditions and the raw materials used for fertilizers. Residues can also occur with spraying, ammonification, and high-tower processes, but in small amounts

Through the soaking test, it was determined that the strength of the product has no significant effect on the disintegration properties of the compound fertilizer. Based on the measurements of the disintegration properties of the product at nearly a hundred different drying temperatures, it was found that the drying temperature has a slight impact on these disintegration properties； Through orthogonal experiments on different formulated fertilizers, range calculations, and significance tests, it was determined that the order of influence of nitrogen, phosphorus, and potassium on disintegration capacity is K > N > P; the most suitable formulation is N16–22%, P10–14%, K10–14%. By analyzing the chemical composition of various fillers, using X-ray diffraction, comparing microscopic images, and assessing disintegration capacity after granulation, the filler type was selected (with calcite as the main component and a calcium oxide content kept below 2%). Of course, disintegration capacity is also affected by compression during storage and transportation.

Is the simple reason that too much coating oil was applied during the spraying process? :lol

External environment: Are the soil, crops, and moisture conditions consistent? Internal factors: Are the amounts of slow-release and coating materials appropriate?； Have the process conditions changed, resulting in different products being formed from the reaction of various raw materials?

Too many additives are used, or the quality of the additives is poor; sometimes, additives such as talc do not dissolve easily.

1. It depends on whether the amount of binder used in your formula design is appropriate. 2. It depends on whether the moisture absorption level of the finished product you produce is suitable. 3. It depends on how the ingredients in the formula react to each other, and whether any undissolved substances are formed. 4. The amount of anti-caking agent used should be appropriate; the maximum recommended amount is 0.4%, depending on the effectiveness of the anti-caking agent

With urea slurry granulation, there should be no residual dissolution. I have conducted experiments on the urea-based products produced by Hubei Yangfeng; using our anti-caking agent of the high-nitrogen type, over 50% of the substance dissolves within 10 minutes, and 100% dissolves within 20 minutes. If the anti-caking agent you use has issues, dissolution may not proceed properly, especially with those of the amine-based oil type

Crush it and see if it dissolves. . . Some compound fertilizers require binders during granulation, which slows down their dissolution. If a fertilizer dissolves too quickly, it will dissolve just as fast once applied to the soil, resulting in greater loss. Low fertilizer utilization rates in the country are one of the reasons. For businesses, this is a good thing; when the utilization rate is low, farmers have to use more and therefore buy more. In fact, a lot of it may have evaporated, or seeped into groundwater, and so on.

Are the current measures to prevent caking mainly the use of anti-caking agents? Should controlling air humidity also work as well?

It might also be related to the components of compound fertilizers; some substances in them are not easily soluble and remain as precipitates even in dilute acids.

One reason is an excessive amount of binder, which leads to severe solidification of the compound fertilizer particles; therefore, its dosage needs to be adjusted. Another issue lies in the ingredients used in the formula – although the same nutrient elements, namely nitrogen, phosphorus, and potassium, are added, it matters what type of additives contain these nutrients; different additives result in significant differences in solubility

It’s probably a problem with the additive you’re using. I wonder if your additive is clay or something else, and what is the amount used?

It may be due to reasons such as low grade of the phosphate ore feedstock, high impurity content, or excessive drying temperature.