Yellow leaves and purple stems

I go easy on nutes. I usually lightly feed every 10-14 days. All my plants are fine except my tallest plant. I'm starting to see yellow fan leaves and purple stems. I'm currently in week 4 of flower. I just fed her some bloom/mag-pro, but do you think it needs more nitrogen? I've read mixed things.

Light feed? PPM's? Week 4 you should be around 500-800ppm depending on your nutes.

I use RO water and when I checked the PPMs with nutes were like 200. And I didn't realize but the nutes was bringing the pH down to 4.5 so I redid it and gave 475 ppm and 6.5 pH. Hopefully this helps. How often should I feed? Weekly? Will these yellow leaves recover or once they get that way they are done?

It more phosphorus and patasium they need in flower . Hit me with so pk boost..purple stems iv had most the way through. Also told it is making of a strong plant

magnesium,

purple stems and yellowing leaves because they dont have enough mag to continue photosynthesis...epsom salts or botanicare sweet.

needs magnesium....essential in photosynthesis, your leaves are dying and stems purple because of it. Put some botanicare sweet or epsom salts on them. Cal-Mag could work too but if you use that ide still use epsom or sweet

I added some mag-pro. What's the best way to add epsom salt and how much?

vinny2times said:

I added some mag-pro. What's the best way to add epsom salt and how much?

Click to expand...

Just add tea spoon to a ltr of water

Ok thanks. Should I add during watering? Or foliar spray?

Don't foliar this far into your bloom phase.

so 1 teaspoon per gallon, let it dissolve, and water plant?

I've never used Epsom salts but Mr Buddy above said a teaspoon per liter.

that's 4 teaspoons per gallon. doesn't that seem a little high?

What is that 20ml? It sounds high to me but again I have no experience with epsom application. I've always used liquid cal-mag.

Thinking more on that I think it's hard to od a plant on cal-mag so maybe it's just right. In coco I'd give 150-200ppm of Cal-mag with no issues noticed.

should i feed every other time i water (growing in soil)? how will i know when it recovers?

Im gonna give you some diff advice. Dont worry about it. It will grow. Some yellowing at 4 weeks is not great but dont try too much. It is mag deficiency but you need to balance your base nutes. Once these get balance you wont save the leaf but the problem will be isolated.

Get in the habit of using CalMag with every feeding.. It's an ounce of prevention.

Yeah that's what I'm thinking. I've been using RO water since day 1. I added 8 tbsp of dolomite lime to my 5 gallon fabric pot, but I guess it's not enough.