Coco Grow - Leaf Symptom

[Aheadatime]

Hey you guys. Anyone know the issue is? This leaf symptom is only showing on the bottom leaves of the girls. Tops are healthy and green and growth is good. They're being fed twice a day, Ro water with 170ppm calmag and ~400-450ppm AN sensi coco grow.

 

[Logan Burke]

One of the larger size fan leaves in that very first picture there shows classic magnesium deficiency symptoms. Which is strange, because you're giving a decent dose of Calmag. Are you sure your PH is in check?

 

[jarvild]

Hey you guys. Anyone know the issue is? This leaf symptom is only showing on the bottom leaves of the girls. Tops are healthy and green and growth is good. They're being fed twice a day, Ro water with 170ppm calmag and ~400-450ppm AN sensi coco grow.

Cut the cal-mag down and replace some of it with mag-sulfate instead. First pic with the streaks running up the stem is a good indicator of phosphorous starting to get locked out by too much calcium.

 

[Aheadatime]

One of the larger size fan leaves in that very first picture there shows classic magnesium deficiency symptoms. Which is strange, because you're giving a decent dose of Calmag. Are you sure your PH is in check?

pH is always good. I mix nutes fresh once every 3-4 days, and AN's pH buffers don't wear out for ~10 days in my experience.

Cut the cal-mag down and replace some of it with mag-sulfate instead. First pic with the streaks running up the stem is a good indicator of phosphorous starting to get locked out by too much calcium.

Will do. What ppm range am I shooting for with the epsom?

 

[TintEastwood]

I struggled initially with coco. This info helped me better understand the beast.
https://cocoforcannabis.com/how-to-prepare-and-buffer-coco-coir/

 

[jarvild]

pH is always good. I mix nutes fresh once every 3-4 days, and AN's pH buffers don't wear out for ~10 days in my experience.



Will do. What ppm range am I shooting for with the epsom?

That depends on if your AN nute's displays the ratio's of the nutrients in them. As in how much cal-mag and it's ratio to each other.
Normal amount to start with is around 1/2 gram of Epsom per gallon and adjust from there.

 

[Aheadatime]

I struggled initially with coco. This info helped me better understand the beast.
https://cocoforcannabis.com/how-to-prepare-and-buffer-coco-coir/

I've been growing in coco for roughly 3 years now, and I've done the buffering myself in the past. It's just too much work for me at this point, and I use canna coco.

That depends on if your AN nute's displays the ratio's of the nutrients in them. As in how much cal-mag and it's ratio to each other.
Normal amount to start with is around 1/2 gram of Epsom per gallon and adjust from there.

Thanks. I'll give it a shot.