Potassium def

chucktownskunk

Well-Known Member
i have a k def. how do i treat it? my leaves are yellow and have the rustic looking spots on a few of them do i flush or add something i'm doing a hydro ebb and flo!:?
 

smokeybandit22

Well-Known Member
will need a good bloom fert-would say molasses if u were in soil but in hydro it is a no no. something with ratios like 0-2 for N, 10-15 for P and 10-15 for K.
 

chucktownskunk

Well-Known Member
do you think that if i flush them for a few days with just water and slowly bring them back to full strength they will be ok?
 

brasmith

Well-Known Member
i have a k def. how do i treat it? my leaves are yellow and have the rustic looking spots on a few of them do i flush or add something i'm doing a hydro ebb and flo!:?
Pics would help us diagnose this issue for you. Details details.
Food?
NPK?
PH?
Flower?
Veg?

May not be a K problem because that only happens with ph issues.
 

brasmith

Well-Known Member
i have a tri meter hooked up to it its telling me that the ph is 6.2
Bring your ph down to 5.8 so your plant can maximize and use the nutes. Hydro 6.2 is too high, here is a ph chart. Looks like you could be right about lacking K (calcium issue is on its way) and as long as your ph is high other issues will arise.

NPK of your food?
 

smokeybandit22

Well-Known Member
wayup brasmith? listen , where did you read that about the k issue with ph problems? Just had severe bout of k def with a daily rapid dropping ph. overfriggin nite. I thought it was prob a lockout. nice advie as usual bra.
 

brasmith

Well-Known Member
Thanks Chuck. Did you notice you hit 300 posts?!!! And you became an official ganja smokin' pot head, congrats.
 

smokeybandit22

Well-Known Member
hey bra, I found this on the sticky for 'Icmag'. my ph was dropping 5.8-5.2ish over 6 hours and that locked out my k, or it just didnt have enough.

Hydro and Soil less Mediums

Potassium gets locked out of Hydro and Soil less Mediums at ph levels of 4.0-4.5, 6.0-6.5.
Potassium is absorbed best in Hydro and Soil less Mediums at ph levels of 4.7-5.3, 6.7-8.5. (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a potassium deficiency.

also was mixed with p issue and slight mg.
 

mick54683

Active Member
before i plant my seeds i like to put seaweed and bannana peels in the ground works wonders outdoors especially if there are lots of worms around
 

smokeybandit22

Well-Known Member
heard banana peels will release ethylene gas that before flowering will induce female flowers-not males-. have a strain that likes to go hermie so gonna try it.
 

brasmith

Well-Known Member
wayup brasmith? listen , where did you read that about the k issue with ph problems? Just had severe bout of k def with a daily rapid dropping ph. overfriggin nite. I thought it was prob a lockout. nice advie as usual bra.
Hi Smokey. I get most of my grow readings from Maximum Yeild Magazine. Check them out they have excellent articles with great detials on all kinds of growing. I have a book that is pretty good too, but lacks the extra details that I'm always looking for: Cannibus Cultivator, by Jeff Ditchfield and he says "Potasium is usually locked out by high salinity" So salts build up can cause this K issue as well. If ph is too high (^alkaline, salts based) resluting in k lockout. Salts build up????? we tossed this around before in PMs, we're getting closer to the answer.

hey bra, I found this on the sticky for 'Icmag'. my ph was dropping 5.8-5.2ish over 6 hours and that locked out my k, or it just didnt have enough.

Hydro and Soil less Mediums

Potassium gets locked out of Hydro and Soil less Mediums at ph levels of 4.0-4.5, 6.0-6.5.
Potassium is absorbed best in Hydro and Soil less Mediums at ph levels of 4.7-5.3, 6.7-8.5. (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a potassium deficiency.

also was mixed with p issue and slight mg.
Very curoius stuff here, potasium is a fussy element, no wonder there seems to be alot of issues with the ever illusive K.
 

brasmith

Well-Known Member
5.5 is just a bit low, you are almost there, just a little up to 5.8.

Just curious, did you happen to change out your res lately?
 
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