AK-47, first growth, brownish/whiteish patches on leaves

Hey everyone. Long time lurker on this awesome forum (i mean it) and i have started growing with the info i could gather within this forum. My grow is 4 weeks old. I waited too long before re-potting my plants so the growth stunted for a while but now it seems to be doing much better. Yesterday i increased the temp within my room from 77 F to 82 F. Today i checked my plants and first thing i noticed was the humidity had jumped from 48% to 59% along with the temp change. Another thing i noticed was, on one of my plants (AK-47) had some white patches at random locations on its leaves. Some leaf tips were curling up as well. I swiped through some stickies and some similar posts in the forums but to be earnest i couldn't fit my symptoms into any of them (well probably because i'm being too sceptical).
Here is some historical data about my growth:
Soil : Soilless Mix with 6.4 PH and some mild nutrients
Water : Drinking water, PH'd to 6.6 using lemon juice
Light : LED 450W - 3 feet from plants
Light cycle : 20/4
4 weeks old growth from sprout
Temp : 77-78F during lights on and 68-70 during lights off
Humidity : Around 50%

Oh by the way, i'm using 1/4 strength veg nutes high in N. Thx in advance for your helps folks

maybe 1/4 strength is too strong just now? lower down a tiny bit, looks to me like a little bit of nute burn, I'd deffs try lowering the nutes just a tad

especially lower the nutes if your soil already had some in it, she only looks small, and is probably still using the nutes available in the soil...

Hmm then i better use just water without any nutes for 4-5 waterings. I water every 4th or 5th day. Thx for the tip Tickle much appreciated!

Way to much fert. Flush it and let it alone for a couple weeks. Then come back with 1/4 of whatever you were at 1.

So i stopped using Nuts for a month now and this is how my plant looks like :


So my guess is Nitrogen deficiency but i might be wrong. What do you think ?

edit: How much fruit should i expect if i start flowering the plant in 2 weeks and flower around 8 weeks ?

yeah, looks like a bit of an N deff. The rest of the plant looks pretty good though. I would go back to using 1/4 strength veg nutes might even be ready for 1/2 strength (feed water water of course) until you start flowering.
As per production its very hard to say how much your going to harvest (between genetics, light, the nutes and medium your using its a big variable) but expect the plant to double in size (plus a little more probably w/ bud growth). By the way the plant looks, you may get about an ounce off of it. this may sounds low but I always set my expectations lower so I can be pleasantly surprised.

Happy growing

i did as u suggest and went with 1/3 str 4-1-4 veg nutes.

I was also expecting around an ounce. I think that's realistic but did u mean after curing or wet ?

Thank you a bunch foodcooker much appreciated!

Why would you increase the temps? Get them down to 68 degrees

ryan1918 said:

Why would you increase the temps? Get them down to 68 degrees

Click to expand...

isn't that kinda low ??

by the way, the leaves of AK-47 are quite small compared to my other growths (jack herrer x sour diesel, amnesia haze and super silver haze) even though this plant is 1 month older than any of them. Conditions are same for all plants. All plants except the AK-47 are doing great but AK-47 is just getting bushier each passing day albeit its leaves don't grow large. Any ideas ?