First ever grow - Auto-AK - Ideas on issues? Want to learn for next one.

[369614]

Hi guys, I have had some issues with my grow and looking for some ideas as to what they were from people more experienced than me.
After a feed during week 4 many of the leaves developed black/purple tips and edges which have remained throughout the grow up till now at end of week 7.

As well as purple leaf tips it also has purple stems and some purple growths in the bud sites.

This is a CFL 250W grow
Soil,
Using biobizz grow + bloom + cal/mag(which I just recently started using)

 

[namvet25]

First off,make sure your ph is right around 6.4.That first pic looks like nitrogen def.Gro and bloom should help that.The purple might be phosphorous and potassium def.What dose are you giving them?Also some plants will have some purple on the stems and this is quite normal.

 

[369614]

Thanks for the reply, I have been using biobizz grow since week 3, started at 1/4 strength and up to 2ml per watering, now cut back to 1ml per watering. Bloom I only started at week 6, currently giving about 3ml per watering.
I water every 3 days.

Would an incorrect Ph cause the plant not to take in phosphorous and potassium? I have not controlled the Ph of the plant during this grow at all. I have just fed it using water of Ph 6.7 and biobizz nutes say they are perfect Ph on them.

 

[namvet25]

yes,ph will effect nutrient uptake.If bio bizz says 6.7 than go with that but I would increase dose to full strength at this point because they use up a lot of phos and potassium during flower stage.