Help! Ak-47 keeps turning yellow

[Alohamomma]

I have an AK-47 outdoor grow about 4 feet tall. It started with a few yellow leaves toward base, but now seems to keep moving up. Notice the fallen leaves in dirt. I feed it on the Foxfarm liquid feeding schedule once a week. Any ideas what it can be or no need to worry?

 

[Sueet]

Probably getting ready to flower and wanting more food, the bigger one at least, looks very hungry.

 

[Alohamomma]

Probably getting ready to flower and wanting more food, the bigger one at least, looks very hungry.

Should I increase the nutrients?

 

[garybo]

If your plants are in late flower, say the 15th or 16th week, then what your seeing is normal. As the flowers are getting older, the plant moves nitrogen from lower leaves, which are no longer needed upward toward new leaves and growth of the flower.
Also, same as the excess growth in the middle of the plant, the plant is cleaning out excess leaves so the sun and air can circulate better.
Perhaps trim some of the excess growth from the plants center so sun can enter and air will flow better keeping mold down.
Spark up

 

[Sueet]

Should I increase the nutrients?

I would, at least for the larger plant, adjust by very small amounts and give the plant a couple days to let you know if it needs more. I definitely agree with @garybo about trimming some of the lower growth to avoid mold.

 

[Alohamomma]

Thank you all for your help

 

[VanIslandConnoisseur]

magnesium deficiency

when the plants energy needs are highest(flower) plants needs for magnesium and phosphorous are highest

solution: add dolomite lime if in soil and calmag if growing with salts, preferably calimagic from general hydroponics