22 days into flower, too many yellow leaves--what wold b the issue(s)?

I'm growing this super haze in a hempy bucket and has been flowering for 3 weeks but now im getting a bunch of yellowing going on but also some browning and i think there are a few things going on here, my guess would be issues with K and MG--what do you guys think?
I'm using the General Organics line, GROW, BLOOM, BIO BUD, BIO WEED, BIO ROOT, DIAMOND BLACK, and was using their CaMg but switched to Botanicare Calplex and Huvega for CA and MG. 1000w HID, rotating fan, closed loop set up in a 5x7x7 room with temp around 74.

Here are some pix:








thx in advance.....

yeah it is a n def but looks like your plant has unbalenced ph , if soil add hydrated dolomite lime to rise ur ph to atleast 7, plain water for a few days then start nutes at a low consentration dose and aplay foliar feeding as well... hope this could help

greenlanter said:

yeah it is a n def but looks like your plant has unbalenced ph , if soil add hydrated dolomite lime to rise ur ph to atleast 7, plain water for a few days then start nutes at a low consentration dose and aplay foliar feeding as well... hope this could help

Click to expand...

the plant is growing in a hempy bucket with 75% perlite and 25% coco.
it's been only three weeks of flowering and this a 10-12 weeks plant.
ppm was at 800 last feed and did a RO water flush 2 days ago- what would u say ppm should b for the next feed?
I don't think ph is a problem, iv been following the General Organics info which suggests to not adjust ph which is what j did the last crop without problems although I used soil not hempy.....

if you are providing the nutrients and the plant seems not to be able to intake those same nutrients you use to aid your plants become the problem due to build up... those leafs show sings of mag def , i looked in cervantes bible over fert due to ph unbalance the plant is taking nitrogen from leafs cuz it cant absorb from the medium...i have this problem with sativas that like to strech alot and fast , and become charlie brown trees if action not taken...

I would agree on the N deficiency, and i would also say that your potassium is lacking too. Flush it like greeenlanter says and then apply those nutes. Check your pH just in case too, never can be too safe.

what do you guys think ppm should b at 3 weeks in flowering?
I was thinking about the K not being enough based on some info uv read, yellowing starts with older leaves from tips and moving inward which is whats happening with mine - also, how too much Ca can lick up K and Iv been using GO CaMg which is 5-1 in percentage so.... maybe too much ?
iv switched to Calplex and Huvega so I can have better control.
Also, I have EarthJuuce Meta-K which I will use.