Holes and yellowing 1 or 2 problems?

Thanks in advance for anyone who gives their advice. I am growing 4 fem photo plants in hydroponics in a 4x4x6 with a 1000w de mh running with a dual exhaust ac temps sit at 21 at night and around 26 during the day sealed with 40-50% humidity light sitting at the top of tent. They're in their 4th week veg. I noticed a couple holes in one of my plants but I thought it was due to lack of nutes because i was late on feeding them. Just after i noticed the holes so two days ago i raised the ppm from 190 to 600ppm (general hydroponics 3 part even amounts of each bottle) A day after i noticed yellowing on all the edges of the 4 biggest fan leaves on two of my plants. Im wondering if i have a pest problem on top of something else or is this a single problem? Any opinion or suggestions would be greatly appreciated.

I don't think it's pests. PH levels? Water type?

Tap water and it was sitting at 6.2 the morning i woke up and saw the yellowing i adjust it to 5.8 with watered down ph down

Manfredo is on the right track...what do roots look like?

I did notice a few hairs falling off on the worst plant.

Hairs falling off they aren't even in flower??
Gather some more advice....

My guess is phosphorus maynot be functionally available to the plants. But the usual suspects Ca,Mg, K.

Do you check your nutrient solutions pH before feeding?

Look a bit bunched at the top along with other visual symptoms of phosphorus (?) Or something else.

You can correct with foliar spray but not a good long term strategy.

I did not check my nutrients solutions ph. Would that make the nutrients unavailable?

LNCR1999 said:

I did not check my nutrients solutions ph. Would that make the nutrients unavailable?

Click to expand...

Yes...definitely need to check that. That's possibly your issue.

They do look light on nutes in the pics, so they may straighten out now that you have raised your nutes.

I am thinking cal/mag issue too...Give them some....They need a ton at this stage. Have you used the well water before without having to add CalMag?

Armor SI by GH is a great product IMO and will help strengthen the plants a LOT, but you always have to add it first before anything else.

This is my first grow. I live right beside a purification plant my water comes out my tap around 45ppm so calmag would make sence they were showing cal mag problems a week ago. I fed them but only about 1/3 of the bottles feed (general hydroponics CALiMAGic)

Ohhhhh, it's city water and not well water? Are you letting it sit in an open container for a day or 2 to let the chlorine evaporate? I've heard that is smart to do...I never had city water myself (for growing that is). And yes, Calmag, and check your Ph after you have added everything. And you may need to up your GH nutes a little more too. Give it a few days though. I am actually using GH for the 1st time in a 100 liter aero system as kind of an experiment, and having a few issues myself...I normally grow organic in soil.

Good to calibrate PH pens often too.

Yup ALWAYS CHECK what the ladies are eating I use half strength nutes to start and check daily ph pen and EC meter are A must in hydro. There are lots but check reviews the best hand held is the red one you calibrate with screwdriver EC meter is basic but calibrate monthly. If you ec drops the next two days add more nutes,PH 5.8-6 its all patience and practice just keep it simple. Cheers mate oh and I use city water ppm 262 ph 7.2 and still managed in DWC. ITS all gooder