Hello again!

I have problems - again - with my first grow. 5 weeks into veg, the lower leaves of the plant have started going yellow. I did not use nutes, and read that this is basically a full NPK deficiency. So I applied some, namely B'cuzz aarde (two bottles, one A and one B to be combined and diluted in water. 21-14-28) . 5 ml of each per litre of water, watered, leaves still yellow. HPS light, plenty of ventilation, good temperature, and pH at approx 7. Plants currently on 18/6.

Any ideas? Should I up the nutes over the required dosage? Picture added for reference ;]

Thanks in advance!
I just hope the next grow will go over better
kraz Reviewed by kraz on . Lower leaves yellowing, what is required? Hello again! I have problems - again - with my first grow. 5 weeks into veg, the lower leaves of the plant have started going yellow. I did not use nutes, and read that this is basically a full NPK deficiency. So I applied some, namely B'cuzz aarde (two bottles, one A and one B to be combined and diluted in water. 21-14-28) . 5 ml of each per litre of water, watered, leaves still yellow. HPS light, plenty of ventilation, good temperature, and pH at approx 7. Plants currently on 18/6. Any Rating: 5