Leaf turn yellow and brittle + PIC

[DeVeill]

I have 2 plants showed yellow spot on the leaf and it turned crispy.
Can you guys help me figure out why and how to solve this problem??
I am thinking maybe it's Mg defficiency or nute burn.

These plants are 3 weeks old and it's the second time i use FF nutes on them.

 

[Dyannas son]

i would have to say its nute burn in my opinion but im just a newb???

 

[DLtoker]

I think we can rule out Mg deficiency right now... But, calcium may be the issue along with a possible nute burn. Give her a flush and another watering with just water then start nutes at half strength of what you were giving...

 

[shuggy4105]

when did you first introduce nutes?

 

[DeVeill]

The first time i use nutes on them was on June 26 with half strength of FF. I didn't have any brown leaf like in the picture after i used it. 3 days later June 29 when i use full strenth FF nutes i found some yellow leaf.

 

[whereismymind69]

Dude, my opinion is that it could be either nutrient burn or overheated, I don't know your temperature conditions. If it is nute burn looks to me that if you keep givin them the correct amount of nutes it should not be a problem. I have a few yellow spots like those on 1of my babies and new growth came up and the problem did not go any further, just keep an eye for the next week to see how it goes. Bro, take care of your babies... will be following ur thread. Regards from UK!!!!!!!!

PS: Check this out It may help you a lot!!! http://www.drugs-forum.com/growfaq/97.htm

 

[DeVeill]

Thankx for all the help guys.
I checked the plant today and didn't find any new yellow spots. And didn't see any yellow spots on new growth...
So i'm planing to leave the way it is now. and let you guys know how it goes in a week.