Hi,
Most 2- or 3 component
nutrients come in components for a reason. The reason is that some of the chemicals may (actually would) react when mixed together at (certain) high concentration. The components I know of are calcium nitrate and calcium chloride, but there may be others. Those will react with sulfates and decompose calcium to a non-soluble calcium. In some cases trace elements come in a single (third) component to assure a better chemical stability of chelates. Although this is not common, some (as a classical or modified hoagland formula) come with that third component.
In your case I don't see how adding them in a wrong order versus adding them at once may have affected your
nutrient solution in a way that it gets screwed up to have lockout. Actually the component which contains chemicals that are supposed to highly react with others (calcium nitrate and calcium chloride for instance) should be added
first- in order to assure that they are diluted first and thus their reaction potential is 'neutralized' first. As in A and B for some two component programs. From my understanding the order is recommended by logic, but not by strict necessity. And from my logical understanding and knowledge, there should be no difference between adding them at once or in a "wrong" order anyway!
In case of surely diagnosed nutrient lockout (due to chemical reactions in the nutrient solution), nutrient should be replaced instantly. Roots should be cleaned and watered, the setup flushed and cleaned as well. Combined foliar spray may help the plants to recover more quickly and before nutrients are absorbed normally again. Foliar spray should focus on immobile elements (mainly Calcium, Iron, Zink and Copper)
PS: there may be various other reasons for nutrient lockout - I only focussed on this case. It's always advised to strictly follow manufacturers instructions and guidelines.
Hope this helps
