Large brown patches on plants Day 50 in veg-photoperiods

[LucidLucy]

Problem: brown patches and spots

Medium/grow method: Happy Frog soil with added perlite

Feed: and supplements used: Grow Big, Cal-mag & Big Bloom once per week starting at day 28

Water source: Tap that’s been bubbled for 48 hours. Hardness unknown.

Strain/age: 2 Laughing Buddha photoperiod 50 days in veg. Topped at day 19, transplanted 9 days ago. Problems showed after transplant.

Light used: 2 VIPARSPECTRA Reflector-Series V600 600W LED Grow Light with bloom light on @26 inches from plant. running lights 20/4.

Climate: indoor tent. Temps 75-80F RH 45-55 but RH is most often around 48.

Soil PH is 7.0 according to Accurate 8 ph meter

This problem started after a transplant that was done 9 days ago. The transplant went fine but I had to move them into the flowering tent which has much more light then they were getting before. I moved them into 5 gallon smart pots so they no longer fit outside the tent.

I am giving them 1.5 liters of water every two days now that they are in smart pots. They were getting much less before transplant. Smart pots are a learning curve for me. They get dry very fast.

I give Cal-mag & Big Bloom at full dose once per week starting at day 28 and they have had one 1/4 dose of Grow Big a few days after transplant. Problem got worse after this feeding.

Thanks for any advice

 

[Waira]

:smoking: Hi Lucy! ....that's looking like P defc. to me,...likely lack-of, not a lock-out in this case... That said, you're tempting fate with some of the micronutes (Fe, Zn...) with pH that high.. sometimes when there's low level shortages on them, that can trigger other borderline defc. into showing symptoms because of how they interact with their uptake and metabolism (truth is plants can suffer minor defc.'s well before showing outward signs),.... Also, note that Big Bloom is beyond mild in NPK, it not a fertilizer per se IMO, too weak,.. I like this stuff, but treat it as a supplement.... Plus, overall nutes have been minimal, so feed her more now... you can dose her with Tiger to get more P in there right away, and don't bother pH adjusting it, the acidity will help bring the pH down,... try to find out about your water's hardness, pH, ppm/EC... if it's very hard, it can have a cumulative pH raising effect because of all the CaCO3 going in....

 

[LucidLucy]

Thanks a bunch Waira, will do.