Overfeed? Maybe P deficiency

[dwarven]

Hi Guys,

At 3 May, 6 days ago this plant had 50 cm height (20 inches). I've feeded with N and P (2 ml of biogrow and biobloom).
Right now she keeps having 50 cm height and she has the yellow leafs since them.



Do you think i've overfeed her? She has almost 7 weeks now.
When i've started seem the top yellow leafs i've tough it was lack of N but i've waited a few days to see what happened, and from the other leafs it's now seem like potassium deficiency.
Yesterday i've just watered without nutrients.

 

[Muddy]

It does look like a P deficiency, but it could also be pH related. What's your pH?

At 7 weeks the vertical growth has stopped and they are into full flower so you should be giving them bloom nutes, which will be higher in P. But it won't help if your pH is off.

 

[dwarven]

Well my friend, unfortunately i can't tell you because i was lamme and i didn't order a ph kit, and right now i can't buy at my town.
But i've been using the same water since the beginning of the grow, and on the last water i gave she i let her evaporate and i also have a bomb pumping the water with c02. Btw, you can check this plant a week ago here (no yellow leafs or so): https://www.autoflower.org/f5/dwarven-farm-7587.html

In my case i can't make a PH test in 2 weeks at least. What would you recommend me, keep giving her water and see what happens? And on the next time, buy one ph kit for sure!
Just one thing. When you say it's a P deficiency that means that my P levels are to high?

 

[namvet]

Just the opposite,it means you need more phosforus.

 

[The Squid]

Right, but it won't help when you don't know what your ph is, dwarven. Not exactly sure what to do. Just feed her plain ph 6.5 water and maybe she will stabalize. With no meter or anything, you're in the dark, mate.

 

[agito]

how much bloom are you giving they should be on around 1-1.5ml grow and 2-3ml of bloom at least by now each water. Also i hope your letting them dry out between waterings as well

On the safe side a dose of MG should be given around week 5

 

[dwarven]

I was giving 2 ml bloom and 2 ml grow (i'm letting dry).
Well, i guess i should buy a bottle of water that has PH 6.2 and in two days or so i'll give her plain water and see if changes. If don't, i'll add 3 ml of biobloom.

 

[dwarven]

Hi guys,

I was being a little stupid about the PH meter. I've a animal store at the end of the street and i didn't even remember that! The dudes sold me a PH tester (not a digital).
I've made the test to my tap water and to my last feeding of nutrients, the PH is around 6.5 and 7. The PH of nutrients seems to be more approximate to the color of 7 than the clean tap water, or maybe i'm not seeing very well the colors differences.

I've been giving the same water source to the grow since the beginning.

I guess i should now feed her with P, maybe 3 ml of biobloom.

 

[The Squid]

6.5-7 is not bad. If you add nutes to that then it is most likely going down in ph and that should put you in range unless it goes down too much, but I wouldn't really think so. Those color drop tests are great for clear water but a PITA(pain in the ass---stole that from Muddy) for water that has been discolored from nutrients. This is why a digital ph meter is a must for almost every grower.

 

[agito]

3ml bloom should be ok