whats causing my leaves to look this way?need help please!!!

we'll my plants have been doing great and were looking green and healthy.but now i have alot of yellowing leaves and some with burnt brown curled tips.it's my first grow.so have no experience to go by.just wondering what some of you experienced grower think may be the cause.and should i be worried or not.the ladys are 4 weeks into flowering now.it has been realy hot the last week in the grow chamber.;ike up around 90 peak temp.and i figured out that i was only feeding them 1'2 the strength nutes that was suggested by botanicare.so did i cause nute burn by upping the nutes on them.should i have slowly upped the nutes.what would you suggest i do.

How is your PH ... is this in water or soil ??
How are you feeding them ... you just started flowering (4wks is early)... when did you make the switch ??
Did you go light on the Blooming nutes ?
Are you adding anything else like CalMag for extra nutrients as your plants shift to bare fruit ??

Peak 90 is a bit high ... how are you venting ??

too many nutes?

there in a 50/50 mix perilite/vermiculite.my ph is around 7 in the mix and my nute/water is at 6.thanks for the quick response guys.

P deficiency I do believe or Mag

we'll i had to do something. couldn't just sit by and watch this happen to my babys. so i flushed with rain water.and referted with a little lower dose and used a little grow with the bloom like i did in the transition phase.i also added a tsp of Epsom salt for mag,tsp of molasses and tsp of hydrogen peroxide because see a little green algae on top of my mix (just a little).but im thinking the heat has alot to do with it just checked the cabinet and it was like 95 in there.so i cracked the doors open a bit to help vent.i already have a pc fan drawling cool air in from the air conditioned room and a 5" fan to circulate the air.could use one drawling the hot air out at the top.just have vent holes at the top of cabinet. hopefully they will shape back up.thanks for the help guys.im learning as i go.i tend to have to learn things the hard way.

my closet was 97 but when the door got shut they drooped. I corrected it right away with proper ventilation and have had no problems yet. Learning from error is the best way my friend.

Yo are running the show in perlite/verm mix that will hold the moisture and the nutes ... as also all the secondary minerals ... but you flushed that with rainwater. (make sure that pH is stable) and cool down that place ... if your ambient is 95 then over the bulb it's 100.
You have done all you can and then some ... let them do their thing. They will recoup.
Start looking for a portable air conditioner.

Good luck.

i checked th ph of the rain water it was right on.plus it's what nature intended for the plants to live on anyways.there turning around now and the buds are starting to fill in nicely now about 5 weeks into flowering now.here's a few new pics of my ladys.

Brother I am happy that things are turning around for you !!
Did you resolve your temperature issue ??

yea kind of i just keep the doors to my cabinet cracked open while the lights are on for now.going to go to lowes and get an 4" duct fan.just haven't made it around to it yet.and it not as hot now.heat wasnt a problem til it got like 90+ outside with a heat index over 100.and the temp of 90 in my grow chamber were at the light level.

ed rosenthall once said if its not suitable for a human baby, more then likely its not suitable for a healthy plant.

id try to lower the temp down to a good 80 degrees with better circulation and exhaust. itll make or brake your buds when they get bigger near harvest.

too hot in there and yes that was nute burn---I have found no need to feed unless they are starting to get a bit pale--the plants droop like that when they get over fed to much water and or heat--sounds like you have two of the three---good job on the flush---3 times the size of the container when you do flush---the rain water is nice as it has no chlorine or flouride in it. (just acid---haha!) "acid rain?" Looks good and you saved them--prob won't need anymore food after that for a while. Next stop gonna be Molasses and H20 till the end then R.O H20 for the last 3 waterings. About 3-4 weeks.

chevymangrow said:

yea kind of i just keep the doors to my cabinet cracked open while the lights are on for now.going to go to lowes and get an 4" duct fan.just haven't made it around to it yet.and it not as hot now.heat wasnt a problem til it got like 90+ outside with a heat index over 100.and the temp of 90 in my grow chamber were at the light level.

Click to expand...

Don't waste your money on one of those 4" fans from Lowes. They are booster fans and don't do much. I have a 6" from them and I can't wait to get a high velocity inline fan that works.

thanks for all the info guys.ive post on another site and haven't had any help really.