yellowing and a bit of rust spots

as the title says i have yellowing and a bit of rust spots on my leaves..is this nute burn or fert defincies?

almost 5th week into flowering.
400w HPS
potting soil
MG 15/30/15 NPK
i just watered them today with just plain water..the last watering i watered them with water and topped them off with a quarter strength on nutes.

god i hope its a nut deficiency..i was feeding them at full strength until i noticed some nute burn..or i thought was nute burn..maybe their hungrier than i thought.

also some of the leaves are drying up and turning crispy..which is why i thought i was over feeding them.

ok so i gave them a quarter dose of nutes,and if it improves then i will up it to half dose..in the 5th week of flowering i would think that they would be rather hungry.

What is the ph of the water ur feeding them and the run off ph? I had the same issue, same week, using hempy bucket though, and my ph going in was 5.6 but run off was at 7.2, causing a lock out of nutes. Didnt catch it for a week and got what u have. im betting ur having ph issues.

Never ever ever give full strength unless you wanna deal with bullshit.like crispi.plants..

City Grower said:

What is the ph of the water ur feeding them and the run off ph? I had the same issue, same week, using hempy bucket though, and my ph going in was 5.6 but run off was at 7.2, causing a lock out of nutes. Didnt catch it for a week and got what u have. im betting ur having ph issues.

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Agreed, I think it is a ph issue, locking out nutes.

not real sure on the ph atm i have this crappy soil ph meter,but it jumps all over the place..(its not a digital)..i will be ordering a good Hanna ph meter along with a bunch of other good stuff for my DWC grow

I have never ever given mine more than half strength.....ever. They just don't need and Deffinitly don't want it.
The bellowing.going on is normal from the shutdown of n from switching to bloom food..

they look different than in the pics..the veins are yellowing along with tiny yellow spots on the leaves.

so what do i do..flush the crap out of them?

dtischerd said:

not real sure on the ph atm i have this crappy soil ph meter,but it jumps all over the place..(its not a digital)..i will be ordering a good Hanna ph meter along with a bunch of other good stuff for my DWC grow

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Its hard to help if we don know all the info, ph being a major one. Incorrect ph can cause major head aches. Even though you watered with plain water and half strength nutes, if ur ph is off, ur problem is more than likely going to get worse because ur going to keep trying to correct the wrong issue.

Check out e bay man, I think I got my digi ph tester for around 25 bucks. If u camt get,that, go to a pey store or swimming supply place and get one of,those ph testers for pools. Not as accurate as a digi pen, but better than that tester ur using. I would throw that thing out, they are junk.

i will be ordering this ph meter...http://www.ebay.com/itm/300369891086?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649...friday night..friday is payday.

ok i followed the directions exactly on how to check the ph of my soil according to my meter,and i get 6.8 all day with no fluctuation at all,and the water run off is the same at 6.8,but remember this is a soil ph meter so i dont thing the runoff will be accurate.

You have a Potassium problem there, older leaves are burnt and intervienal yellowing. This I would say is probably due to a ph lock out as City Grower has stated, since you are going into flower the plant wants more but due to lock out this is what happens. I would give it a water with some straight water a couple of times or with something with a micronutrient wash. Good luck. DST

I have one of those, go and stick it in a bath of acid and it'll still be at 6.8, lol. Seriously they are not very good.

dtischerd said:

ok i followed the directions exactly on how to check the ph of my soil according to my meter,and i get 6.8 all day with no fluctuation at all,and the water run off is the same at 6.8,but remember this is a soil ph meter so i dont thing the runoff will be accurate.

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yea the meter is called rapitest ph meter.

ok so i will just give them plain water for the next few waterings..would a flush help?

so earlier today i flushed the Sativa with 5 gallons of water hopefully it will help..the Indica i just gave it a quarter more nutes,because it had a bit of yellowing on a couple leaves only..my ferts are 15/30/15 NPK.

my question for everyone here is..will the yellowing of the leaves on the Indica and the yellowing of the veins on the Sativa go away? or will it just not get any worse?