Hello,
I am trying to obtain a clear and stable NPK solution from potassium chloride (KCl) and monoammonium phosphate (MAP). Urea included as well. From the first glance, it looks like that all components dissolve as usually and all liquid is clear after heating. However, after cooling some precipitates appear and forming solid crystal on the bottom. Why did it happen? Maybe somebody confronted together with this problem before or have any solutions/ hints and ideas how to solve it? In litterature, there is information that compounds are compatible together. What is necessary to change or modify in preparation process to obtain a stable and clear solution for long fertilizer storage?
Thank you in advance.
@ Mantas, precipitation occurs when cations and anions in aqueous solution combine to form an insoluble ionic solid. May be you are facing the same. Have you tried KNO3 with MAP? Probably you may get rid of precipitates.
Use high grade of fertilizers.
What makes a fertilizer high-grade?
Publication date: Wed 3 Jun 2020 Author: Annet Breure © HortiDaily.com
High-grade fertilizer A fertilizer is high-grade if it is pure. For a soluble fertilizer, this means, among other things, that it dissolves fully, instead of one or two percent remaining undissolved.
Hello, this may be caused by the temperature dependency of the solubility of some K fertilizers such as KCl or KNO3. What you can do is to check the minimum temperature in which you will store the solution, and stay below the maximum solubility of KCl at that temperature.
You may use Monopotassium phosphate with urea whether any precipitation occur or not.
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