Leaf tip burn and nitrogen deficiency.

Greenthumbgrower1986

Greenthumbgrower1986

Well-Known Member
Hi all currently growing an auto blue cheese in 13l rhizo pots using bio bizz light mix and bac nutes. She's in her second week of flower and has been on 1.5ml bac grow and 0.2ml root stim per litre. She started yellowing from bottom up very quickly (nitrogen deficiency?) with nute burnt leaves, any advice welcomed
 

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yosim

Well-Known Member
You would think with the yellowing of leaves below that the plant is not getting enough nutrients but the burnt tips seem to suggest too much - however it seems your leaf margins are just about to start turning brown as well
not familiar with these nutes at all so will let someone else comment - it could be some sort of lockout but it does seem more like N deficiency, something is not adding up
 
Greenthumbgrower1986

Greenthumbgrower1986

Well-Known Member
yosim said:
You would think with the yellowing of leaves below that the plant is not getting enough nutrients but the burnt tips seem to suggest too much - however it seems your leaf margins are just about to start turning brown as well
not familiar with these nutes at all so will let someone else comment - it could be some sort of lockout but it does seem more like N deficiency, something is not adding up
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Lol I know it's very very strange, have 2 others on there which are doing fine and have been on the same everything
 
Kassiopeija

Kassiopeija

Well-Known Member
Bukvičák said:
Maybe I see it wrong but looks like whorled phylotaxy or fasciation on one of your stems...? Tap or RO?
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indeed the one cola seems to develop tricodyl...

yosim said:
not familiar with these nutes at all so will let someone else comment - it could be some sort of lockout but it does seem more like N deficiency, something is not adding up
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yes it now needs some NPK food and throw Mg right therein, as well
 
Budzbuddha

Budzbuddha

Well-Known Member
During this stage , ppm should float around 1000ppm as flowering pulls from itself or medium.

Doing soil testing is moot as autos only need an average life of 90 ( + or - ) - simple feed requirements. Its pulling nitrogen from the oldest leaf. Which i suspect was a bit under since you are only at 400 or so. Late veg should have been 600 - 800 ppm. Tip burn happens but it isn't the complete picture .
 
Greenthumbgrower1986

Greenthumbgrower1986

Well-Known Member
Budzbuddha said:
During this stage , ppm should float around 1000ppm as flowering pulls from itself or medium.

Doing soil testing is moot as autos only need an average life of 90 ( + or - ) - simple feed requirements. Its pulling nitrogen from the oldest leaf. Which i suspect was a bit under since you are only at 400 or so. Late veg should have been 600 - 800 ppm. Tip burn happens but it isn't the complete picture .
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So up my feed is the best answer
 
Bukvičák

Bukvičák

Well-Known Member
Greenthumbgrower1986 said:
Took some of the soil out of the pot
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You can bet yourself that in different parts of pot is different pH. Burned tips + deficiency do not match, so your issues come out from rhizosphere. I am not familiar to Biobizz but I have done a lot of slurry tests on a brand new soils and never got values above 6,0!!! So I strongly doubt that you can values get values like 6,4 when you have already used ferts. Only way how to measure your actual soil pH is with Apera or Bluelab soil pH pen! Whorled phylotaxy or Tripolid means mutation when more or three leaves growing out of one place on the stem ( instead of common 2 leaves). This is an issue by itself with longer rippening phase and lower overall yields.
 
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