Yellowing and brown spots on leafs HELP PLEASE!!

[wiha]

Hey all its my first grow and im in week 7 with my Royal queen northern lights

I don't know what to do anymore i started to see that my leafs are yellowing and start having brow spots so i thought im having PH problems and i started to water with distilled water and now its getting even worse .
i really need you guys to help me fix this problem.
im growing in soil 20L air pots and biobizz nuts feeding every 2 -3 watering .
My plants have 3 more week to harvest and i dont want to lose them .
thanks for the help
http://www.siz.co.il/my.php?i=zzxginmyiyjj.jpg
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[The ferret]

hello there my friend,i have the same problems in my previus grows,imo this is a (p)-(ca) deficiency,it hapens when your soil p.h. is 6 and below,for sure you must check your ph....
then flush and give some bloom nutes....

 

[wiha]

Thanks for the fast reply

My tap water is around 8.5 should i PH them to 6.5 - 7 before i flush ? or leave it as is and my soil will fix my tap water PH alone?

 

[The ferret]

what is the p.h. in your soil?

 

[wiha]

I just flushed my plants runoff water is PH 7 hope that will fix my problem

Anyway thank you all for your help now we will see what happen ill update when ill see the results

 

[Spanglish]

I see you said that you are using Bio Bizz nutes every 2-3 waterings, what Bio Bizz nutes are you using in what amounts per feed and in what soil. Also how often are you watering, most Bio Bizz nutes are recommended to be used every time you water. Looks like the same CalMg def i have had on my past couple of grows, but i am still learning so would wait for confirmaton from some of the more experienced members here. Either way the extra information will help anybody looking help with your problem.

At this late stage i dont think you will lose your plants due to this, but it may well affect your total yield and quality.