Can someone see what's wrong with my plants?

Question from a fellow grower:

White widow
Soil in pots
System soil in pots
Ph 6.5-7
Ec tds -NA
Indoor
250-400
Day temp 75 night 65
Humidity around 45
Ventilation yes. small charcoal filter intake and exhaust fans.
No AC humidifier or de-humidifier
No co2
Thank you for your time and help.




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Hope this helps

http://www.thctalk.com/cannabis-forum/showthread.php?19873-Plant-Problems-Deficiencys-(Pics!)

You do know that leaves turn yellow,sometimes have a few spots, and just dry -up > Leaves post came from what part of the plant top, middle, bottom ?