Serious problem

[Oski]

hi

could anyone tell me what might be causing these leafs problems please?

they are at the bottom of the plant but it works its way up.

growstyle is DWC, ph is 5.5-6.0, res temp is a steady 68F, room temp 75F, humidity 50degs, res ec 0.9 fed with canna aqua flores.
before the leaves drop, they become completely necrotic.

this problem is happening in both my veg room and flowering room.

i think its fungal or mg def, but im not sure.

help much appreciated, thanks

[FallenForever]

you are watering your plants to much
and they need nitrogen and boron and probably some Potash.
get a nute of like 25-10-10 and then after that about two weeks add a high potash and boron+iron food


hope they heal


trim off all the leaves like that

[Oski]

these are in hydro, in bubblers, so i doubt its overwatering.

cheers anyway.

[Oski]

please, please can someone help me.

heres some pics ive taken from plants that are young in the veg room which have the same problem.

ive filled in a questionnaire from another site to give complete info.


HYDROPONICS:

What STRAIN are you growing? mandella kaichakra and other mandella strains
What was the establishing technique? (Were the seed or clone?) rockwool
What is the age of your plants? 5 weeks in veg
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? veg but also affecting my flowering plants in flower room
What Technique are you using? DWC
What substrate/medium are you using?(Hydroton, RockWool etc.) hydro, DWC
What is the Nutrient temperature? 68F
What Nutrient's are you using? Canna aqua vega and flores
What is the TDS/EC/PPM you are using? 0.9
What is the pH of the "Tank"? 5.8
Are you sure your calibration is correct on your equiptment? absolutely sure
When was your last watering? i top up every day to maintain correct water level
When was your last feeding change? (ie. grow-bloom-micro-additional) once a week
What size bulb are you using? flo's in veg, HPS in flower
What is the distance to the canopy? 2" under flo's, 18-24" under HPS
What is your RH Factor? 50degs
What is the canopy temperature? 75F
What is the Day/Night Temp? (Include flucutaion range) 75F constant in veg, 76 in flower day, 72F in flower night
What is the current Air Flow? (cfm etc.) 160L extract, 2x150A intake
Is the fan blowing directly at plants? no, oscillating over plants
Is your water HARD or SOFT? 0.2ec
Has plant been recently pruned, cloned off of or pinched? yes, light pruning to keep height down
Have any pest chemicals been used? If so, What and When? no
Are plant's infected with pest's - no




please someone help, this problem has been going on for 3 grows now.

[Damar]

Do you think it might be nute burn? You top off the reservoir everyday... I thought I read somewhere that you should let the reservoir run through a certain amount of cycles before you top off, but not sure... you could try cutting nutes out completey, and at least that way eliminate that possibilty. Either way, the burning and curling of your leaves, indicates that there is both and over nutrient problem, or even maybe a pH problem... I don't know much about this special type of mandela strain, but it's possible that it is very picky about reservoir pH... and 6.0 is still too low? Just try to change one variable at a time and eventually zero in on the problem.

[Oski]

Originally Posted by Damar

Do you think it might be nute burn? You top off the reservoir everyday... I thought I read somewhere that you should let the reservoir run through a certain amount of cycles before you top off, but not sure... you could try cutting nutes out completey, and at least that way eliminate that possibilty. Either way, the burning and curling of your leaves, indicates that there is both and over nutrient problem, or even maybe a pH problem... I don't know much about this special type of mandela strain, but it's possible that it is very picky about reservoir pH... and 6.0 is still too low? Just try to change one variable at a time and eventually zero in on the problem.

hi

perhaps it is nute burn. ive reduced the ec from 0.9 to 0.8.

anyone else got any suggestions please?

[brownstain]

Looks like a sign of potassium defienciency. That's just me of course.

[Damar]

Yeah, i was too blitzed and tired last night to finish off my post saying that another possibility is that the wrong concentration of nutrients could do the opposite of nutrient burn as well, aka, locking out any and all nutrients so that deficiencies are arising...

try pure water flush and see what happens... once thats out of the way, start with some low nutrient dosages and work ur way up incrementally.

[GrowBot]

Just glancing at your post i'd say you were messing with the rez too much. Don't try and make it perfect at all times. You're overdoing it. The ppm and the ph will vary at times based on the plants needs. I would fill the rez once a week and top it off with ph'd water in-between. If it needs something, it'll tell you. I think right now it needs you to stop babying it.

[Durban_Guy]

Dude changed ur nutrient brand to something else. thats a mg and nitro problem.