Multiple Problems: leaves curling upwards & downwards as well as rust colored spots

Man...Im having Major problems right now...kinda complicated word problem too...growing 3 different strains( sour D, purple kush, GDP) with two different ages..the sour d and gdp are approximately 3 months old while the purple kush is about a month old. I vegged the first two straings for two months while correcting a yellowing problem. They all have been flowering for approximately 2 weeks...about a week ago i noticed that the young purps as well as the gdp had leaves curling downwards...so i flushed using six gallons of water and superthrive, then i watered with strictly water for a week..after a week i noticed no significant improvement in the leaves and they were starting to yellow. To stop the yellowing i put them on a 50% diluted solution. Well now the leaves are still curled downward, mainly on the gdp and purp kush with a lot of yellowing. i've also noticed that the sour d's which were doing pretty well now have a significant amount of leaves curling down and also up!!!! and to make things worse ive noticed small orangish spots (looks like the leaves have rust!!) on the sour d's. My growing medium is soil, im using the cuttiing edge solutions fertilizer mix. i dont have any pics today but will have them tommorrow. i would really appreciate any informative help because right now i feel like im shooting in the dark....medium:soil

all those at the same time sounds like a ph problem.

ph is at 7 in the soil

thats a bit high, try getting it down to around 6.2-6.5. should help clear that up.

other than leeching how do u suggest to lower the soil ph? Also this should clear up the leaf curling, rust spots, or both?

my suggestion is to flush your plants with ph'd water at least twice as much water as you have soil. then when they stop draining water again with ph'd water with 1/2 strenght nutes. then don't water again untill the soil almost dry. it should let the plant pick up a bit. the brown spots won't go away but it should stop and the leaf curling down should flatten back out. and for the ones curling up, might be a mag def cause of the ph being off or it could be heat stress. keep the temps below 80.

hell of a setup you got there

should all the leaves uncurl after leeching and if not should i releech?

they probably won't uncurl completley till at least a week of good ph and nute conditions. just get the soil to a good ph and nutes and keep it there and don't over water.

Thanks i appreciate the advice. one more question... why add nutes so quickly after trying to flush them out??

cause the plant still needs nutes but because of the ph the nutes you were adding were just building up in the soil making your ph problem worse. so you flush to get all the built up salts and what not out then start fresh with soil with the right ph and the right nutes and the plant should respond.

I am having the same problem but i am growing Hydro. I am using Foxfarm nutes with Liquid Carma and SubCulture. I check my ph every morning and it is usually at 6.8 and i bring it down to 5.7-5.8 The ppm is at 1150 in veg stage. I have rust colored spots on some large fan leaves.

even after i flushed the soil with ph 6.2 water, the soil ph is still hovering around 7.1.

and how are you testing your soil?

basic soil moisture/ph tester...stick it in the dirt....what do u suggest?

is it calibrated or does it even have a calibration on it? if it does that might be off, or your soil was way above 7 and it barley brought it down to 7. did you flush it right, if you didn't flush enough their still might be too much stuff in the soil.

in fact this is my second flushing in three months and i check my soil ph daily and its always hovered at 7 at best, 8 when theres some salt buildup...any suggestions??

yes it is calibrated...i flush with 6 - 7 gallons water (3gallon pots)....in fact under the best circumstances it hovers at 7.

more flushing???

damn. don't know what to tell you then other than try watering with a lower ph like 5.5 and see where that gets you.