Yellowing Leaves

[Kultura]

I have posted another thread not long ago, cause my leaves were curling over.

i found out i had rather high ph more than 8.
what i did, i bought some ph stripes to check the ph, and bought some ghe ph buffer, the solid one(phosphoric acid with some added calcium, and magnesium)
i have decreased my run off ph graduatilly to around 6.5
plants seemed to react good, but now im seeing some new yellowing leaves that i dont really like

it started from the first set of non true leaves(one of them is already dead, and the other one really yellow), and its spreading to the first set of leaves.

i transplanted them a few hours ago, hoping to seem some improvement or not, and help clarify the issue here.
i ve put them into a larger por (3 liters) the soil is the same, bio bizz all mix.

-i dont know if they have soil to hot for them, at this time bio bizz all mix, shouldnt be to hot for them, and i havent added any ferts yet.
-maybe salts built up, calcium and magnesium agraveted with the ph buffer? altought my water ppm is not too high.
-change in ph? i did try to do it slowly
-or maybe nuts run out on that soil and they need fert?

the symptoms dont seem so clear for me.
hope the pics will help

SOIL:
What STRAIN are you growing? northern Light#5
What was the establishing technique? (seed or clone?)seed
What is the age of your plants?3 weeks
How Tall are the plants?10 centimeters
What PHASE (seedling, vegetative or flower) are the plants in?vegetative(18hours lightining)
What Technique are you using? (SOG, SCROG etc)Scrog
What size pots are you using? (Include how many subjects to pot)3 liters
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)Bio Bizz All Mix,It consists of 20% sphagnum peat moss, 35% garden peat, 10% high quality organic Worm-Humus , 30% perlite and 5% Pre-Mix.
What Nutrient's are you using?How much of each with how much water? How Often? *Knowing the brand is very helpful*Not Yet
What is the pH of the "RUN-OFF"?run off ph 6.5
How often are you watering?when the pot feels light
When was your last feeding and how often are you feeding?not feeding yet, soil comes pre ferted with organic matter,lasts 3 weeks
What size bulb are you using?400 watts hps, son t agro
What is your RH Factor? (Relative Humidity)around 60%
What is the Day/Night Temp? (Include fluctuation range)Day 27º Night 32º
What is the current Air Flow? (cfm etc.)Fan
Is the fan blowing directly at plants?Yes
Is the grow substrate constantly wet or moist?moist, drys a little in the night(closet closed, temperature up)
Is your water HARD or SOFT?around 100 ppm
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?Tap water, left evaporating clohrine for 2 days, in grow room
Has plant been recently pruned, cloned or pinched?Yes top branch, 2 new branches look healthy
Have any pest chemicals been used? If so what and when?Definitely Not
Are plant's infected with pest's? dont see nothing flying around

 

[Runbyhemp]

Doesn't look bad to me. Slight N deficiency. You say the Biobizz mix has enough food for 3 weeks, and they're about 3 weeks right ?

Might be time to give a feed.

 

[sirgrassalot]

She just transplanted into fresh allmix - I'd wait a watering. Your call.
I'd pass on hot soils if at all possible.

 

[Kultura]

i transplanted her to fresh soil with fresh nutes to see some reaction, so ill definitely wait see if she gets better.

i tought of N deficiency, but i guess that shouldn't explain why the new born leaves all show tips of the leave yellow( its a tiny thing that don't show up in photos)
leaves look a little droopy but the leaves margin are rolled up on some of them(could be from previous ph stress?)

 

[MynameStitch]

If you just transplanted into the mixture I would have watered it, it is a nitrogen deficiency, but I would not have fed the plant yet, reason for this is, after those cotyldons yellow up and die off, the plants first leaves are to be next, they are used as feeding storages when the plant gets low, but since you just transplanted I would not have fed them and since they are in all mix, I hope you did not end up burning them.

Your pH run off is also a little high and if gives the plants problems you will need to lower it.

 

[Kultura]

so definitely seems its a nitro deficiency, well thanks on the help guys.

i only transfered them and watered them, didnt feed them yet, as stich and grass said, the new soil as new nutes, so it should be ok, if the problem persists ill refer here for more help.

what u think should be the perfect run off ph value MynameStich? 6.3?
i read a lot of places were they consider 6.5 to be perfect for mj, this is a doubt i have long ago.
oh and another question, u think i might have problems using ghe ph buffer(dust,added calcium and magnesium), since my water ppm is around 100 ppm, can it cause sault built up, or is it safe with this values?

thanks a lot again guys for all the help.

 

[sirgrassalot]

so definitely seems its a nitro deficiency, well thanks on the help guys.

i only transfered them and watered them, didnt feed them yet, as stich and grass said, the new soil as new nutes, so it should be ok, if the problem persists ill refer here for more help.

what u think should be the perfect run off ph value MynameStich? 6.3?
i read a lot of places were they consider 6.5 to be perfect for mj, this is a doubt i have long ago.
oh and another question, u think i might have problems using ghe ph buffer(dust,added calcium and magnesium), since my water ppm is around 100 ppm, can it cause sault built up, or is it safe with this values?

thanks a lot again guys for all the help.

I'd wait a watering before you feed them. A pH 0f 6.4 is ideal. I don't add anything to my potting soil except perlite of pro-mix. Than I feed & water as necessary to harvest. My plants look great.

 

[MynameStitch]

Here is some wacked out information sirgrassalot has given, his pH range is for soil, not for soiless.

for a soiless mixture you want 5.5 to 6.3 all strains are different so which is why the range. I would try to keep it around 5.8 to 6.2

Yes, your problem is a nitrogen deficiency, but it's very minor and I would wait a bit before giving them any food since you just transplanted. You should wait around 20 days before feeding them.

Your mixture you are using weather it's soiless or soil is what value your pH needs to be.

Soiless mixtures need a hydro range where soil mixtures need to be more towards alkaline.
Your range you listed is good for soil.

The ghe stuff you are using is good, since your water is low on micros your pH buffer with the micros will help so you will never need to add cal and mag, so as long as you use the GHe.
Now if you had hard water or your other nutrients had levels of cal and mag then you would want to try to avoid using so much otherwise you get a toxicity.

 

[sirgrassalot]

That pH is fine & won't hurt them like the over ferted baby you damaged doolittle.

 

[Kultura]

good news, as i told u guys i transplanted them and watered them, and im glad to say that the yellowing stoped advancing in the first set of leaves, and also the growth of the plant as returned to normal (i was noticing some stunt growth, obviously from lacking N )

As for the Ph im using soil, unless soiless has a description im not familiar with (soiless = no soil right? like hydroponics? )

MynameisStich my water company says my ppm values should be those i posted, but the tap water has a ph of more than 8, which is normally associated with too much micros (calcium and magnesium)right? , so ill keep an eye watching any signs of toxicity.

Sirgrassalot thanks for remembering my doolittle actually i had 2 burned from the soil (excluding most of them which fried before breaking the soil)
i treated them very carefully and although they were completely awkward in the first week (ill post some pictures, you will see what i mean)
Now they still look Paranormal but have signs of entering the right path.
ill create a new post, so i can show everybody what burning seedlings look like, and if iits possible to still grow something out of them.

 

[sirgrassalot]

I actually meant dr doolittle but lets see the tortured seedlings. As we all see placing seeds into a hot mix is not a good idea. The plant can take a fair amount of abuse once it gets a foot hold in life.

 

[Kultura]

so here are the promised photos.

first 2 photos was a few days ago, below that their were all taken today.

as u can see both plants that were put in all mix from seedling, got burned and suffered weird mutation, both have 2 main branches, and some odd looking leaves.

as for the other plant, she seems to be doing good(really branchy), if some expert could give me and opinion,i did notice that the bottom leaves yellowing from n def, did get some brown spots, i guess its just dead tissue from previous underfeeding and i shouldn't worry right?

anyway i have now a dozen seedling that have just sproud from dirt, and all seems to be going much better so im happier.
thanks again for all the people who helped