Phosphorus or CalMag Deficiency? (pics)

Whatsup dudes,

I'm having a little problem with the girls. This has happened on the last grow as well. Here's the breakdown:

6 x 600w HPS

40 plants in 5 gallon FFOF soil

Strains:
Sour Diesel
Grape Ape
Strawberry Banana
Romulan Grapefruit

Nutes:
Earth Juice Grow
Earth Juice Bloom
Earth Juice Micro
Earth Juice Catalyst
Nectar of the Gods Medusa
CalMag
Humus
Sugaree

Right now they are coming up on week 4 and the week 3 feeding was

5 gallon RO water hand watering

5 tablespoons Grow
5 tablespoons Bloom
3 tablespoons Micro
4 tablespoons Catalyst
3 tablesspoons Medusa
2 tablespoons CalMag
5 tablespoons Humus
4 tablespoons Sugaree

PH 6.2-6.4

I had some PH issues but hit them with some GreenCure. I think I have some heavy feeders and it might be a P deficiency but I'm looking for any other suggestions. Much appreciated.

Hey weedz, are you able to test your pH and PPM in the runoff? What are your environmental readings? There is an array of nutritional issues here but so many factors could be contributing that it's hard to pinpoint from the pictures.

always check ph and tds of runoff first. 50% of the time ph is off, salt build up is locking out nutes, or ph is off because of salt build up.

Thank you for your replies. The room is between 70-75 degrees. Humidity after watering is 50% then a few days after it drops to about 35. The PH of the runoff is 6.4. I haven't checked the PPM's since a couple grows with these feedings. A dude at the hydro shop told me with organics nutes PPM's can't be calculated. But with the week 3 feed the PPM's would be between 700-800.

I water/feed once a week. Do you think its salt build up? Should I feed then a few days later water then feed again after a week? The crop I had 3 harvests ago with this recipe was green and healthy throughout until the last couple weeks which is normal.

With organics there is no salt build up. Heavly medicated now lol. Your ph is good. I would say your right. They are just heavy feaders. Unfortunatly with organic nutes it takes the microbes time to break it down. Personaly i would hit it with a weak pk booster like kool bloom or crystal burst but then you cant say its organic any more. Next grow with thoes strains i would top dress with roots organics uprising bloom the day of flip and week 2 of flower

Forsure. Thank you. I do have some Kool Bloom set aside. I'll try giving them a boost.

@Monster Gardens can you please elaborate on the nutrient issues you see that I'm using?

Dynamo626 you rock, your definitely close. Number 1 above listed is that your feed mixing order. Number 2 pH issues high or low if so was your reducer nitric, citric, or phosphoric acid based. If pH fluctuations high change or clean ro filter better next round. This one's easy though.

Nitrogen deficiency, micro always goes into mix first. By day 12 to16 the rations should look more like m-4 g-2 b-6. In organic your sugar ratio should never be more than 50 percent of your microbes supplement until week 6. To correct this issue, water twice with only adjusted ph nitric acid. an enzyme to break down what you got, you overfed. If you have time and green light 1 hour before lights come on spray underside of fan leaves with micro lightly until it's time for your next nutrient feed.

If the grower's first post is correct, using tablespoons instead of teaspoons, all of you are wrong in your assessments.
First off, you don't really need much fert if using FFOF soil. It has nutrients already in the soil. This is why you pay extra for it. You could buy something cheaper, but it probably won't have nutrients.
To add more fert to FFOF soil is usually a mistake. To add teaspoons is a bigger mistake. To add tablespoons is a huge mistake. There are three teaspoons in a tablespoon.
The grower needs to show pics in white light only, not sodium, but even in that yellow light it's easy to see the dark green mixed with dying yellow, which tends to mean a plant is being over fertilized. As in, poisoned to death.
There really isn't much to do but flush once and leave them alone. Hope for a decent finish. That soil is so full of fert now that it's unlikely you'll get good product. The buds will be full of fertilizers.
Just use FFOF soil next time when the plants get to be about 8 inches tall or so. Don't add anything else unless you're certain you have to. Don't listen to a grow shop worker. They are there to sell you stuff and make money off of you. They probably don't grow anything at all.

Under a 600w light ffof definatly needs more. A tbs sounds like a lot. The roots organic line when using there feeding chart calls for tsp per gal. I have no experience with your nutes maby roots organics is more concentrated idk

Take pics in white light next time too. Can't see color well in sodium.

Oh man. It doesn't look like nute burn or over fert tho. But it has happened since I started using FFOF. One run is was fine. The Earth Juice line calls for tablespoons. Not sure what to do at this point but the product always comes out good.

Would be best to start over with just FFOF until you're sure you need to add some fert. And go easy when you do. What does over fert look like to you? Should be dark green leaves and the leaf tips and edges turn yellow, then brown, the whole leaf starts to discolor (go yellow, then brown) as the plant slowly dies. That's what you have there.

I agree with polishpollack. I made the same mistake some what.
A lot of soils have enough nutes packed into them you dont need to add anything except a couple feedings during flower some times.
Give yours a flush and hope they respond well.

Thanks for your replies. Now that I thought of it, the plants were vegging in this FFOF for about a month so I thought it was time to add nutes. I've flushed them twice and will give them a low dose. I have pics with flash but its not letting me upload them.

Actually it did but some are the same but didn't say. Here's the others.

That really looks like over fert. Remember that you have to be careful how much fert you add over time in soil because the fert you gave last week will probably still be in the soil.

Forsure. Think I should start with half strength?

If it were me I would just go straight water for a while and see. Checking PH of course.