latewood ,stinky.......anybody.HELP

[starmark]

This reaccuring problem has been with me for the last 3 grows,ive been able to finish except for the last grow which killed all plants at about week 5 of flower.no problems seen untill about week 3 or 4 then it comes on quick.White widow grown in rockwool ,ebb and flow,ph i keep at 5.6 however checking runoff for the first time ph was 7 in rockwool ,so i thought i found the problem and flushed a few times from the top of the rockwool and changed rez however problem refuses to be cured.Using gh 3 part and keep ppm around 850 tp 1000 ,temps in room get up to 90 ,running 3 1000 watters with lots of air movement and also started using co2 boost(great product).Problem starts with leaf tip curl....leaf will curl all the way up into the bud,ive never seen anything like it in 3 years of growing .ro water with calmg is also used.Appears to be phosphate def but i dont understand why im unable to fix, once it starts......any thoughts??

starmark Reviewed by starmark on 06-05-2007. latewood ,stinky.......anybody.HELP This reaccuring problem has been with me for the last 3 grows,ive been able to finish except for the last grow which killed all plants at about week 5 of flower.no problems seen untill about week 3 or 4 then it comes on quick.White widow grown in rockwool ,ebb and flow,ph i keep at 5.6 however checking runoff for the first time ph was 7 in rockwool ,so i thought i found the problem and flushed a few times from the top of the rockwool and changed rez however problem refuses to be cured.Using gh Rating: 5

[PharmaCan]

Starmark - while you're waiting for an answer to your question, you might want to check out this thread - another pH problem. The thread's kinda long and there's a lot of foolishness in it, but it also has a very good discussion about nutrient lock out, why it happens, how to fix it. It sounds kinda like you're having a similar problem, so maybe it will help you.

Good luck!

[Weedhound]

Whats the room humidity? Water temps? What exactly is c02 boost? I understand the C02 aspect but is it a machine or ?

[Weedhound]

There's no foolishness in that thread. Here's another link also Starmark....you may have seen it already but in case you haven't. This one is really excellent.

International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!

[stinkyattic]

Hmmm I am leaning towards Calcium def on that one but the pattern on the far right leaf is weird.

[starmark]

ya...just read that thread its great,humidity is about 50% in room and rez temps are too high about 80,however i keep tons of airstones in rez and the water is boiling with oxygen,but still may be a concern....as far as the co2 boost here is a link.this shit works ...highly recommended,its direct co2 to the plant.its the cats ass as far as im concerned. the co2 airline in covering my 3x6 ebb and flow tub,i blocked the end of the hose and drilled small hole the entire lenght to evenly spread the gas,i use a timer to come on when lights are on...of course on large grows this wouldnt be practical but its working great for 20 plants..CO2 Boost - All-natural CO2 Generators for the purpose of CO2 enrichment and air fertilzation