Coco Grow new yellow leaves

[westcoastcocogrower]

Hello there,

Sativa plant 10 weeks. Everything has been fine using just pure blend grow at 12ml and 5ml cal-magic. Only change I was using an old bottle of calmag before and bought a new bottle. Yellow leaves started right after. Any thoughts?

 

[mysticepipedon]

Yellow tops might be from pH being off or a deficiency, but it can also occur when a plant is experiencing a growth spurt. I'm just not sure about your particular plant.

Because it happened right after giving cal/mag, I would ease up on the cal/mag, because calcium can cause lockout. But that doesn't mean calcium is the culprit.

 

[westcoastcocogrower]

Yellow tops might be from pH being off or a deficiency, but it can also occur when a plant is experiencing a growth spurt. I'm just not sure about your particular plant.

Because it happened right after giving cal/mag, I would ease up on the cal/mag, because calcium can cause lockout. But that doesn't mean calcium is the culprit.

Thanks. Was all dialed in too dang. Maybe old calmag wasn’t as strong as new bottle.

 

[j1sonbrother]

cal-magic from Gh?
how much ec u feed

 

[sjs1488]

cal-magic from Gh?
how much ec u feed

How do you measure ec with a multimeter like what ohm setting do I use

 

[j1sonbrother]

I am PureBlend Lover .But its already have enough calcium in it , and u add 5ml of calmag which is quite easy to occurred calcium lookout.
I ’d say 2.5-3ml calmag will be totally enough and u do need some extra magnesium surfur if u re in coco Led.

 

[mysticepipedon]

Thanks. Was all dialed in too dang. Maybe old calmag wasn’t as strong as new bottle.

The problem isn't that the old cal/mag was too weak, the problem is likely that you have applied too much calcium.

 

[westcoastcocogrower]

PPM .5 conversion 790
u/s 1600