Brown crispy spots on leaves with pictures. Help please.

my plants are just about 3 weeks into flower and this problem that began just after 12/12 persists. lower leaves seem droopy and have a crispy feel to them with spots on all parts of the leaves (some leaves even have holes in them in the area closer to the stem). lots of burnt tips and some deformed leafs. but all the new leaves and buds look excellent. lots of burnt tips and some deformed leafs.

2 bubbleberry plants under a 400 watt hps. 4x5x4 sealed grow box. passive intake. temps 70-79F. low humidity at around 20%. using the full line up of biocanna nutes.

my lack of experience has me lost as to what this could be. looking thought the forums it seems it could be one of a number of different deficiencies.

does this look familiar to anyone? thanks in advance for the help.

looks to me like your either watering it too much or you have your light too close to the plants.

Pic 3 looks like a K deficiency to me.
It needs more potassium,unless that's a lockout.when was the last time you flushed?

Huh?? said:

Pic 3 looks like a K deficiency to me.
It needs more potassium,unless that's a lockout.when was the last time you flushed?

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i haven't flushed. i'm using these all organic biocanna nutes and soil the guys who use it at my grow store say ph-ing the water and flushing is needless in organic growing, and they claim they don't do either.

could this be?

using DWC or hydro?? I'm havin the same problems with two of my plants in DWC, but the plant in soil right next to them is doin awesome...so I;m on my way to the store to grab some FF ocean forest, and gonna put it in soil... i couldnt find out what was wrong with the leaves either, good luck though!!

stonedcold89 said:

using DWC or hydro?? I'm havin the same problems with two of my plants in DWC, but the plant in soil right next to them is doin awesome...so I;m on my way to the store to grab some FF ocean forest, and gonna put it in soil... i couldnt find out what was wrong with the leaves either, good luck though!!

Click to expand...

neither. my plants are in the bio-terra soil.

dr.greenbum said:

i haven't flushed. i'm using these all organic biocanna nutes and soil the guys who use it at my grow store say ph-ing the water and flushing is needless in organic growing, and they claim they don't do either.

could this be?

Click to expand...

You're correct,when growing organic in some mediums like pro mix theres no need to flush.
I forgot about that as I've never grown organic or in soil for that matter.
That looks to be a K deficiency though.Cannabis uses quite a bit of K once you switch the lights.