Help with discoloration - tried 100% megacrop but need help

[karlkutta]

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:

 

[Jackson]

For one what is your ph going in and runoff. Secondly, lower your heat to around 75-80. Only my opinion @karlkutter

 

[Proph]

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..

 

[Frank M]

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

My guess is they are done time to medicate with them

 

[Waira]

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....