over nute??or deficiency

[the big purple]

hi guys,think ive finally got over my root rot probs but now think i have a deficiency not sure if its magnesium or pottassium or over nutes,can any1 help??are the pics ok i can take more out of grow room if needed





the 1 in soil is the mother and the other 2 are the same cutting from the mother
cuttings in hydro

 

[stinkyattic]

For your chemical problems (yes they exist) you need to give more info on your technique.
I can tell you right now though that the primary cause of the sharply up-curled edges is that you are too dry and/or too hot. That's acute heat stress.
Looking at the pic, is that a terra cotta pot with non-lightened soil? It's too deep in the pot, and likely too large for it as well. How tall, and how many gallons?

 

[the big purple]

hi and cheers for your reply.not sure how many gallons the pot is,its not terrcotta its plastic and just says 10",the plant is only about 1 and a half foot high as i have been trying to keep it low,the soil 1 is only a mother untill i can get a nft hydro mother(been having alot ov hydro probs),the other 2 pics are the same plant in nft ph around 6.2 and nutes around 300-350 ppm,it makes sense u saying it could be dry as the other day the water ran low in res and plant drooped but seemed to pull through with water added,also i had the water running all the time but i think i am over watering my other 2 cutting as they are showing yellowwing tips ov the leaves so only have water on 8 times a day for half hour,room temps are 75-80 but the day it dried it got upto 90

 

[stinkyattic]

Okay, a 10" pot will be around a gallon, so yeah that plant could very well use a slightly larger home. See what the root ball looks like and decide for yourself.

Your nute strength is not very high- have the plants been in the system for a while, long enough to become established? If so, you are ready to give a heavier strength feed, but of course monitor for burning.
What is each plant in NFT physically supported in? How many plants, how large, and how many gallons is your res? If you have problems with water level, definitely consider a larger reservoir that is not so prone to running dry.

 

[the big purple]

the nft plants are just in small rockwool cubes there are 3 of them in a gt205 they have all been ithe same lenth of time with the 1 in the picture being the most established(roots spreading through the spreader mat)and around 6" tall,the other 2 have roots only just penetrating the sprreader mat,and only around2-4" tall.i use canna nutes,but have also added trichoderma this time round.i wasnt sure if it was nute burn so held back on nutes wot ppm do u recomend???i put 5ml of a+5ml of b grow and 1ml each a+b flower nutes also a small amount of epson salts

 

[stinkyattic]

By 'a small amount', about how many grams per liter of water?

Canna's site has a really good nutrient feeding schedule posted.
I run those myself actually; shoot I can't even give volumes off teh top of my head but I take them up to EC=1.2 as soon as I know the clones aren't going to DIE on my table, lol, and then run them at 1.6 when they are properly rooted.

 

[the big purple]

on epson salts only around half a gram if that per 15-20 litres.thanks again, will up the nutes and see how it goes,will also check the canna site,i have also left the door open on room th let a bit of heat out and raised the light a little

 

[stinkyattic]

Oh geez, what have you got going for an exhaust? And do you have fans within the room as well? You'll want plenty of air flow, not just for heat, but also for fresh, CO2-rich air.
That level of Epsom salts is perfectly safe.

 

[the big purple]

i do have a fresh air inline fan intake not sure how much air its moving but enough to keep plants moving a little,i also have an exhaust but its just a 4" sqare fan with a pipe on it i am going to add another exhaust but am lazey and not got round to it.my room is a black/white plastic tentand was around 95 ish with just the intake but when i added the exhaust it did lower it to 85 ish but it was warm out side noe its a bit cooler outside the temp is 80 ishi do have a fan for moving air round grow room but as theyre so young didnt want to wind burn them,so have not had it on.