My plant is showing signs of over fert., but i haven’t fert. it at all!

 
 

I’m growing 2 Easy Ryder autoflowering plants in a homemade growbox. They are about 3 weeks old now and started flowering couple of days ago. Few of the plant’s leave tips are starting to pale, and turn from light-green to yellow, but the tips don’t look dry. It looks like overfeeding but i didn’t give them any fertilizers yet so this is confusing me.

Here are the pics of the one plant:

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They grow indoors under 150 W HPS on a 20/4 light cycle, in a regular soil for flowering plants. Brand of soil is Compo Sana with 3% perlite, pH 5,5-6,5 N = 200-450 mg/l P = 200-400 mg/l K = 200-400 mg/l. Distance from light is about 25-30 cm (11 inch).

I water them every 4-5 days with about half liter of tap water, with few drops of lemon, pH measured at about 6 – 6.5. It was never fed with any fertilizers.

Temperature goes around 20 – 27 C (68-80 F), humidity around 45-55% most of the time. Pots are 5 liter (1.32 gallons).

Any ideas what the yellowing of the tips is?
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URL: http://cannabisculture.hanf.ws/2012/04/29/my-plant-is-showing-signs-of-over-fert-but-i-havent-fert-it-at-all/
 
 

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