Yellowing leaves with brown tips

[KapnKush]

The plants are 6 weeks into flower I've noticed yellowing leaves with brown tips and they are curling downward.

 

[joemamadave]

needs potassium

 

[KapnKush]

What would you recommend I use?

 

[SmokingWings]

What would you recommend I use?

It helps to know a bit more.

What are you growing in? Is it a true-soil or soil-less medium?

Have you been using any sort of fertilizer up to now and any particular schedule?

For the most part any source of Potassium (K) will take 1 to 2 weeks to start taking effect. To me, the idea is to get something into the medium to slow down, maybe even stop, the change in the leaves. You are at 6 weeks now and how many more do you plan on going?

Any info you give will help the group come up with something that might work for your growing methods.

 

[KapnKush]

I'm growing in hydroponics I didn't use cal mag for 3 weeks I did put it in this week (100 ml) I just started week 6 yesterday and I plan on going to 8 weeks

 

[SmokingWings]

I didn't use cal mag for 3 weeks I did put it in this week (100 ml) I just started week 6 yesterday and I plan on going to 8 weeks

Potassium is what @joemamadave mentioned, not cal-mag.

I don't grow in hydro but if someone who has experience with those methods stops by they are going to need to know what you are using for nutrients up to now. What company, brand or system are you using? Are you following some sort of schedule?

 

[KapnKush]

Whatever the problem is it's getting worse quick I have a photontek465 and it was 14 inches from the plant I moved the light up now it's 20 inches I'm hoping it was light burn

 

[KapnKush]

1490 ppm week 5
100 ml cal mag
230 micro
230 grow
330 ml bloom
100ml kelp
150 h202
250 bio thrive
100 slf

The nutes I just put in week 6
100 ml cal mag
165 micro
165 gro
200 bloom
150 h202
150 bio thrive

I don't think it's the nutes because it's only happening to the bigger plant the one that was closest to the light

 

[SmokingWings]

I don't think it's the nutes because it's only happening to the bigger plant the one that was closest to the light

If they both are close to the same age and both went into a flowering light schedule at the same time then I would hazard a guess that the nutrients are sufficient for the smaller one. The bigger one needs more because it is bigger and has more leaf and stem material that has to be fed. That is assuming that both plants are sharing one hydro system.

Since your thread is not getting much attention here in the "Budding" forum maybe you should ask one of the moderators to move it to a better forum, maybe the "Hydroponics" forum will the trick.

If that happens maybe one one photo showing both plants so the bigger one which has the problem can be compared to the smaller one.

 

[KapnKush]

Ok I'll try that thank you

 

[KapnKush]

I just noticed the brain bucket was set to twice a day instead of three times I'm not sure how long it had been like that