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I'm starting to think there is a potassium issue. Growth is not as much as to be expected and some of the older leaves are getting a few brown spots and start to die wrinkle and die.
My water comes from a well and ph is around 7.5. I started to acidify it with some vinegar.
Things are looking better this week. it had a slowish start. a good flush with pH 6.3 could help in short term. Back off nutrients depending on soil make up maybe till spots improve. ppm of water feed compared to run off can indicate nutrient concentrations and take up. All the best