Optimal pH level for growing spinach is from 5.6 to 6.0. According to that I conclude that pH level of nutrient solution have no guilt in failure of my first experiment. There are two possible causes left - toxicity of mineral-wool and lack of light. Additionally Paul T. Juckniess explained that my plants was submerged too deep into solution and usually the crown of a plant do not tolerate being semi submerged. So next time I won't submerge my plants that deep. But in this specific case plants stopped developing earlier - before replanting them into hydroponic setup. This is why I assume that in my case problem was mineral-wool and lack of light. I will try to grow next stack of seeds on turf under natural sunlight.
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