4th Week flowering, same problem rust spots HELP!!!!!

Hello everyone, i'm back again with the same problem as before. i'm, in my 4th week of flowering and i'm experiencing the same problem i've always encountered. let me explain the set-up
1. mk ultra from seed
2. 4.6 x 4.6 x 7.0 tent
3. 600 digital ballast
4. air-cooled inline fan cooling bulb and hood
5. inline fan attached to filter
6. 10 gallon tote (filled to 7.5 gal)


had no problem during veg as usual or first couple weeks of bloom.


i use r/o water 7 gals
calimagic 21ml = 3ml p. gal
micro 56ml = 8ml p. gal
grow 21ml = 3ml p. gal
bloom 70ml = 10ml p. gal
flora plus 7ml = 1ml p. gal
total ppm 965
e.c. 2.0
ph 5.8


3 days later top of with 1.5 gals of r/o water with calimag and sugar daddy total ppm of top off =405


3 days later check tent yellowing and p.h. is 5.9 and ppm is down to 665....
so my question is, am i not feeding enough ....or what?? i'm so confused because this is the second time having this problem... always during that 4-5th week of flowering .
PLease input


this was monday






wednesday









today

pic of my set-up

today

hey brother just a quick guess but what are the roots looking like? do they stink?. your in the stage where they will eat a lot of nutes and drink alot of water so if the water gets low and the roots get no water that tends to start the yellowing that i have seen in my own plants when the air hose was clamped or water was so low the roots started to rot, if that's the case the drain flush and use some hydrogen peroxide with the refill. hope it helps and KEEP ON GROWIN.

If your PPM is dropping from 9xx to 6xx over three days you need to def fed them more. Theyre taking up more nutes that h20.

I'm stuck on the ppm's of 950 and ec 2.0. Anyway they look pretty good. Some people say that a little leaf yellowing is normal. I think it is sometimes strain dependent. I have 3 strains in a room and they all get the same feed. One strain is super green, almost overfed, and the other 2 are getting some yellowing. I think I could get rid of the yellowing with some stronger nutes. I plan to try different feed for every strain next time. Yours could probably handle a little more N.

bass1014 said:

hey brother just a quick guess but what are the roots looking like? do they stink?. your in the stage where they will eat a lot of nutes and drink alot of water so if the water gets low and the roots get no water that tends to start the yellowing that i have seen in my own plants when the air hose was clamped or water was so low the roots started to rot, if that's the case the drain flush and use some hydrogen peroxide with the refill. hope it helps and KEEP ON GROWIN.

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the water had gotten low, but i usually let it get low before res change . i heard that a lil air on the rots isn't bad. as far as the smell, there isn't one. the rots don't look bad as far color. they are stained from the nutes so they aren't a pearly white. but they look strong, fuzzy (hairy), and are massive. when the lights comes back on later today i will post a pic of the rots. I was thinking of flushing with gh flushing agent for 4 hours then using the lucas formula the rest of the way. any input on that?

adower said:

If your PPM is dropping from 9xx to 6xx over three days you need to def fed them more. Theyre taking up more nutes that h20.

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technically it was over a 6 day period ..... after the first 3 days, i didn't measure the ppm .... i just topped off. then 3 days later that's when i checked.

70's natureboy said:

I'm stuck on the ppm's of 950 and ec 2.0. Anyway they look pretty good. Some people say that a little leaf yellowing is normal. I think it is sometimes strain dependent. I have 3 strains in a room and they all get the same feed. One strain is super green, almost overfed, and the other 2 are getting some yellowing. I think I could get rid of the yellowing with some stronger nutes. I plan to try different feed for every strain next time. Yours could probably handle a little more N.

Click to expand...

ppl don't use the same conversion factors so that's why i gave the 2 different numbers. i use the .5 (hanna) ppm pen. but it converts it for me. as far as the N.... i thought you needed N when they are a lite green... these are rust spots, curled tips, and its only on the top (upper) part. i thought about it being just fact the hood was so close but, but i can leave my hand under the light for over a min without it getting hot. and the highest my temps get is 83 at the most. i have a very good air flow going through...... but i definitely will try feeding them more... thanks for advice, deeply appreciate it

i post more pic on Instagram because i'm usually taking the pics with my phone and it's set to instant upload. But i interact and seek advice on here so enjoy the pics


http://instagram.com/dirtyglovegrower_