12/12 jack
Active Member
Im not sure whats going on with this plant, all looked well until about a week ago then more or less overnight this has happened!! Im reckoning a zinc deficiency by the looks of it but I know this is only common if there is a ph inbalance. I have about 20 jacks growing, half under 600w hps and half under 1000w led. This deficiency is showing up on a few of the plants, the one pictured being the worst. More on the hps side seem to be affected and it first started on the ones directly under (nearest) the light. I thought to start off with heat burn from the light could be a factor but as the led ones are showing the same symptons then this cannot be the case. Vital info below...
Strain jack herer, week 4 flower
11L pots with biobizz allmix soil
biobizz nutes, 1m/l grow 3m/l bloom and have just stopped using big bud (recommended between weeks 2 and 4 flower) at 2m/l
temp day 29 night 20
good extraction system
nute ph down to 6.0 when feeding (I feed every couple days when pot almost totally dry)
run off from soil is 7.0
EC run off 1.8
Humidity between 45 - 60
I know zinc deficiency can be common if the ph is out (less than 4.7 or higher 7.5 in soil) but this is not the case here. I always water at ph adjusted to 6.0! Any help or advice would be greatly appreciated. I first noticed this about a week ago when first plant started showing symptoms. Since then I have fed with half strength nutes/ph water/half strength nutes again. Before I was adding full strength nutes with every watering. Now more and more plants are showing these same symptoms.