brown spotting on bottom leaves

Hello all this is my first grow. im growing in soil and into week 4 of veg. i added fox farm nutrients at 1/4th recommended dosage for the first time 3 days ago and noticed that one of my plants started developing brown spots along the leaf margins. this is happening only to the lowest set of leaves.

ive looked at tons of pics to see whats wrong with my plant but im still unsure. can someone look at the pic attached and help me diagnose whats going with my plant and equally importantly how do i remedy it to prevent further damage.

please help someone

ashray said:

please help someone

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Feed at 1/2 strength and add 1 tablespoon epsom salts to a gallon of water. Did you get the micronutrients to feed as well? Boron, zinc and sulfur etc? If so use them. If not buy them. Use the micros each feed!

You probably are running out of minerals in your soil, as you really waited too long a time to feed in my opinion, unless you are in organic soil. Follow what hotrod recommended above, I would add come Calmag + to my food (Epson salts works also) and maybe some additional nutrients like Superthrive or SuperNova by Humboldt to add micro-nutrients. I use a foliar spray also called Spray-N- Grow with supplies Iron and Zinc. You aren't using distilled water, are you, because if you are stop, and just use PH'd tap water to get extra minerals. Plant looks good though, just a little tweak and all should be fine..

thanks for the quick response guys. ive attached an image of my 5 plants and today is day 21 from seed.i have the fox for soil nutes trio pack and i just started the first feeding at 1/4th the recommended level.strange thing is only 1 plant has shown these brown spots (one on the top right). So what i'm inferring is that my plant has Mg and Ca deficiency and maybe i should feed the nutes at 1/2 strength instead of 1/4th. i'm gonna do as advised and hope the problem is arrested at the base. any other thoughts are very welcome and helpful

Please don't start feeding at 1/2 strength and the plants aren't deficient in calcium or magnesium, it was the 1/4 strength feeding that burned the one plant. Fox farms soil has enough nutes for the first month or so of the plants life. By giving them additional nutes it burned one of your girls and not the others. It's not uncommon for one pheno type to be more nute sensitive than the others.
It sounds like it's ok to start feeding all but the one burned plant at 1/4 strength (two times a week?) and plain water to the plant that got burned for another week or so then start feeding her at a light dose.
Good luck my friend!

guys i wanted to know. does nute burn first affect the older lower leaves? because thats what is happening.