Yellow leaves with spots, I can't get it fixed :( please help or advice

Amigo, tiempo de actuar muy deprisa y mi consejo sería que le aportes algo de kelp. En regla hay uno de maravillosa calidad y a un precio fantástico que es el kelp líquido de Cultivers, que se vende en Amazon. El Ascophyllum nodosum (kelp) es algo que no puede faltar en caso que haya desequilíbrios y aqui hay algunos factores que están causando el bloqueo de nitrógeno. Si puedes comprate unas Mycorrizas buenas (Kraken de Mycoterra) y ponlas sobre el sustrato y en seguida haz a lo largo de una semana, tres riegos de un litro de kelp (o sea un litro de solución de kelp a cada tres días) y en un santiamén tendrás los niveles de nitrógeno equilibrados. Nota a cosas importantes....la temperatura tan alta puede estar influyendo en la integración de nutrientes y causando bloqueo y yo si fuera en tu caso tiraría ese orgánico de TA y lo cambiaría a algo biomineral y si tienes la linea completa de Plagron, pues adelante pero no le pongas el Vita Race, pues el kelp le aportara de manera mucho más integrada hierro (en el kelp la disponibilidad vertical del quelato de hierro es más efectiva).

I followed suggestions from @Angus_MacGrower @HeavyHittah rinsed soil (added 10L of water per plant) and got readings from run-off. Surprisingly they were quite ok, PPM was 250, PH was 7.4. I always use filtered water for watering, so there is no chlorine etc. I also tried to spray plants with water mixed with a small amount of CalMAg and N (water ph was 6.4), so far no result. The problem is still not fixed, dunno what to do:(((((( Any other suggestions? I am also thinking to buy a new PH tester

I had a similar problem, the culprit was tap water whose ppm was 350 without nutrients, it contains a lot of lime and chlorine, lime clogs the soil and it is difficult for the plant to absorb nutrients, try to check the water

Hi, your PH is way off ,they are hungry for nitro ,really bad lockout as you wrote PH is 6,5 for sure it’s not .

@Angus_MacGrower @HeavyHittah thank you for the answers, Then I will rinse it. Should I do it ASAP or wait until soil gets dry?

You're probably not watering sufficiently to get enough run-off. As a result, the salts have accumulated in the soil and are preventing the plant from feeding properly, which explains why the soil remains damp for so long. You should rinse the soil before gradually resuming fertilising.

Looks like it's not absorbing nutrients properly. I would take some run off readings next time you feed . Test the run off PH and EC . It will give you a rough idea of where your soil is at. I would guess the pH is off . Excessive nutrients can also cause lockouts though.