Ray, a fertiliZer question please.
 

Ray, I made up a strong stock solution, but I am getting some precipitation.

Why would that be, and is it a problem?

Two possibilities: you are trying to dissolve too much in water of that pH, or there are minerals in your water which, together with the fertilizer, exceeded the maximum concentration to remain in solution. Take a half liter into a large container and add a half liter of fresh water to that. Does the concentrate dissolve?

That also happens to me but I shake it a bit more and everything gets dissolved. But I prepare with the recommended concentrention, not a strong one.

Yes, it is a problem.

Is it a formula with Ca? If so, Calcium nitrate with sulfates -> formation of CaSO4 precipitates (low solvability gypsum). S is a major element, and you might end up as S deficiency.

It is difficult to avoid sedimentation of complete fertilizer stocks without 2-parts formula.

This probably helps: Haifa Group - A leading supplier of specialty fertilizers - Interaction among Fertilizers (Compatibility)

How strong is "strong"?

The folks that manufacture the MSU fertilizer in the US recommend no more than about 2#/gallon, but I can tell you from personal experience, that at half that concentration, if allowed to sit for an extended time, it can still be an issue. In that case, I just shake the hell out of it before dispensing.... however, what precipitates will determine if it will redissolve or not.

OK, thanks.