I personally think in this case its a def of some kind....I think you are looking at several there.....so perhaps even some sort of reaction from several problems at once? They seem much more intermixed in hydro than in soil. For example...nuteburn raises your ph ....now you have 2 problems....and so on. There is also the issue of ratios and balance to think about imo....too much/too little of this nute/mineral etc can lock out another nute/mineral. So I find the ratios MORE important than the numbers themselves.

My thought here is lack of CalMag. But if that were not the issue.....my next thought would be a ph lockout problem ......especially since again we are seeing SEVERAL defs at once....often a good indicater of ph problems if you are positive certain nutes are available to the plant. In this case...I just don't think they were available in sufficient amounts here rather than ph causing the problem.