Help with discoloration - tried 100% megacrop but need help

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Hey everyone. I am using megacrop strictly for this grow and now that I'm in flower they are looking rough. Tried adding some PK but don't see any improvement.

-Problem: discoloration

-Medium/grow method: soil; old soil been using it since a year ago.

-Feed and supplements used: mega crop. About 4-6g per gal. Some pk booster from canna, usually 4-5ml/gal

-Water source: tap water sits for usually 24-48hrs +

-Strain and age: different plants, most about 8 weeks old.

-Climate: rh 45%. Temps generally 87-99

- Light used: LEDs. Mehzi single cob, purple King led light, 3 spot bulbs with dome removed. Total wattage for lights is 300w at the wall. 20/4 schedule

-Additional info:
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For one what is your ph going in and runoff. Secondly, lower your heat to around 75-80. Only my opinion @karlkutter
 
There are a lot of variables at play here. It may be hard to pin point a single issue/resolution. The first thing that comes to mind is your soil.. If you've been using/reusing it for a year, and using a nutrient line during the grows, there's no way to tell what nutrients are available in that soil and what the levels are, without having it tested. You didn't mention re-amending it or adding any sort of microbe life to break down oranic matter, so I assume neither was done. Unfortunately reusing soil isn't as easy as just "reusing it". If you used a nutrient line, you would want to flush that soil and have it tested before you reuse it. Im sure some nutrients are non existent, while others are in excess..
 
Karl, looks like it may be a pH lockout, P defc. especially acting up, but others are in play here,.... you must get an in-pot pH, and a solid flush in any case. With old soil, like Proph said, it can be loaded with some nutes still, out of balance, depleted on others and off-pH,...
2-3x pot volume on flush, and test the pH and ppm of what's coming out to monitor progress, and 1/4 strength nutes on final pour through....
 
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