Deficiency or toxicity?

Jmcsupplies

Jmcsupplies

Well-Known Member
Hi guys

growing in 30L fabric pots in soil
Using growers ark grow and bloom
They were switched to 12/12 on Monday 1st of feb with half veg and half bloom feed so only been in flower a few days
Nutrient ph is 6.5 and the EC is 1.6
Temps are 27c daytime and 20 night time
Quite big plants, 36” from floor to top and 26” from top of soil to top of plant

one plant has gone dark green and a bit of clawing and drooping

they both have leaves like in the photos

sorry about the mess I’m in the process of attempting a light defoliation

any suggestions?
 

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myke

myke

Well-Known Member
If you've been feeding that high of EC all along then Id say thats the problem.These nutes are salt based?
 
Jmcsupplies

Jmcsupplies

Well-Known Member
Yes I started off at 1.0 EC and upped it .1 per week.
Most plants are fine it’s just that one that’s dark green and clawing

ive added some cal mag. You think I should add water and lower the ec?
 
myke

myke

Well-Known Member
Jmcsupplies said:
Yes I started off at 1.0 EC and upped it .1 per week.
Most plants are fine it’s just that one that’s dark green and clawing

ive added some cal mag. You think I should add water and lower the ec?
Click to expand...
When you feed do you get some runoff? Like 20%
 
Jmcsupplies

Jmcsupplies

Well-Known Member
Also, it’s the biggest one that’s clawing and drooping. Shouldn’t a nitrogen toxicity start with the smaller plant?
 
myke

myke

Well-Known Member
Jmcsupplies said:
I don’t get any run off, I’m bottom feeding
Click to expand...
Hmmm. Well. Watering from the top and getting some runoff just helps get rid of the old salts. I don’t know how much you’ve fed over the last while. But it’s a good idea. Inert mediums like coco and peat need the flush on every feed.
 
Jmcsupplies

Jmcsupplies

Well-Known Member
I’ll top up the res with just flower feed to about 1.5 EC on Monday. I’ll add a bit of cal mag too. Thanks
 
TrichomeTester

TrichomeTester

Member
Jmcsupplies said:
Hi guys

growing in 30L fabric pots in soil
Using growers ark grow and bloom
They were switched to 12/12 on Monday 1st of feb with half veg and half bloom feed so only been in flower a few days
Nutrient ph is 6.5 and the EC is 1.6
Temps are 27c daytime and 20 night time
Quite big plants, 36” from floor to top and 26” from top of soil to top of plant

one plant has gone dark green and a bit of clawing and drooping

they both have leaves like in the photos

sorry about the mess I’m in the process of attempting a light defoliation

any suggestions?
Click to expand...
Hello, just came across your post. After looking at the photos you posted the plants are showing signs of what looks like a combination of two shortages of nutrients, calcium and manganese. Calcium is used by the plant more than manganese, so by adding a calcium boost to the nutrient solution, You should see a change, but one must address problems of that nature quickly. Best of luck. Check drain water also and check if your ph and EC are in range.
 
Jmcsupplies

Jmcsupplies

Well-Known Member
TrichomeTester said:
Hello, just came across your post. After looking at the photos you posted the plants are showing signs of what looks like a combination of two shortages of nutrients, calcium and manganese. Calcium is used by the plant more than manganese, so by adding a calcium boost to the nutrient solution, You should see a change, but one must address problems of that nature quickly. Best of luck. Check drain water also and check if your ph and EC are in range.
Click to expand...
thanks a lot for your help!
 
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