MasterRookie
Well-Known Member
Could be a nutrient toxicity, but it could also be a deficiency (picture is somewhat suggestive). In regards to the latter, it might even be an element that you're feeding (or which is present in your soil) in sufficient quantity but one or more other factors are causal in your particular situation. For example, improper pH causes nutrient lockouts and/or the inability to uptake certain nutrients. An overabundance of calcium causes plants to evidence signs of magnesium deficiency, because there is a ratio between those two elements when things are in proper balance (interestingly, this seems to apply to people as well as plants).
BtW, nutrient burn in general terms (IOW, mixed the correct ratio of nutrients, just fed way too much, lol) that I have seen ordinarily caused burned-looking tips on the leaves - not random patches throughout the surface. Compare your plants with the many(, many, many) images and text descriptions about nutrient deficiencies/toxicities that have been posted here at the forum. You could also examine your plants when they are in an undisturbed state in an attempt to see whether or not your plants are feeding tiny insect life; a good magnifying glass or jeweler's loupe can be helpful in this, because some insects are so tiny as to be somewhat difficult to see with the naked eye when not moving.
From the picture, this doesn't strike me as being indicative of light-bleaching, but this can also cause yellowing due to lack of chlorophyll/chloroplasts in the cells.
Hey wassup. I've got a 60x-120x led microscope cuz google pics told me I had spider mites. I found no insects or eggs on top or under leaf. I've been through all the articles with pests and issues and nothing comes closer than ph fluctuations (another friendly farmer from here pointed it out) but with plain tap water that's neutral and a runoff of 6.2 I'm not sure if that's enough to prove or disprove the diagnosis