Intermediate grower needs soil pH confirmation

Hettyman

Hettyman

Well-Known Member
I have just bought a new 400w tent set up (been growing a year) and having problems with this latest grow. I my ladies a week ago, and repotted them 5 days before that in Biobizz All Mix soil, my first time using this over Light Mix. Only had water since repotting.

Symptoms:
White tip - nute lock out
Signs of Mag def - purple stems on recent growth, spreading to veins on a couple of leaves
Signs of N def - new growth lime green

I believe that the all mix will still have plenty of nutes, so i'm guessing that the Nitrogen def is from lock out. This could be caused by the Mag def affecting the plants ability to take up Nitrogen. I have been watering at 6.3ph, but think I should change up to 6.6ph to help the plant use the Mag available. (I added 200ml to each plant of water with small epsom salt dose, plus Mag in new soil). This is all based on what I have learnt over the past 18 months, and the Nutrient/pH take up chart I have, but there is always bad info out there so if anyone can confirm or offer alternatives, it would be gratefully received

I plan to soak tomorrow in 6.6pH water and wait a couple of days, unless anyone advises otherwise

No pics cos I can't take good close ups, and the symptoms I am confident of. If you need any more info please ask

Strains:
Nirvana Seeds - Blue Mystic
Aurora Indica
 
6.3 sounds right on the money to me... you read something that says increasing pH will help Mg uptake?
 
Hettyman said:
I have just bought a new 400w tent set up (been growing a year) and having problems with this latest grow. I my ladies a week ago, and repotted them 5 days before that in Biobizz All Mix soil, my first time using this over Light Mix. Only had water since repotting.

Symptoms:
White tip - nute lock out
Signs of Mag def - purple stems on recent growth, spreading to veins on a couple of leaves
Signs of N def - new growth lime green

I believe that the all mix will still have plenty of nutes, so i'm guessing that the Nitrogen def is from lock out. This could be caused by the Mag def affecting the plants ability to take up Nitrogen. I have been watering at 6.3ph, but think I should change up to 6.6ph to help the plant use the Mag available. (I added 200ml to each plant of water with small epsom salt dose, plus Mag in new soil). This is all based on what I have learnt over the past 18 months, and the Nutrient/pH take up chart I have, but there is always bad info out there so if anyone can confirm or offer alternatives, it would be gratefully received

I plan to soak tomorrow in 6.6pH water and wait a couple of days, unless anyone advises otherwise

No pics cos I can't take good close ups, and the symptoms I am confident of. If you need any more info please ask

Strains:
Nirvana Seeds - Blue Mystic
Aurora Indica
Click to expand...
Personally, I like what you're thinking, go more towards 6.6.
Have you checked runoff?
Got any lime in the mix?
How old are they?
Have you fed at all?
Did the problem start before your transplant?
I wouldn't 'soak' them, but instead run the water through. a couple gallons of water per gallon of soil.
 
Wow thanks for all your swift help.

The chart i'm using and the def pics are the exact same ones I use, thanks chucky, in fact i think it was you that gave them to me originally some time ago :)

Timbo, that's where I got the 6.6pH for Mg uptake

Problem was post transplant, just starting before. They had been in light mix soil for 4 weeks (6 weeks old in total, but first replant at 2 weeks). Fed in the original soil using BioBizz range, but not in the new soil.

Just found these pics of just before and just after repot, no real signs of def's there. They also went from a CFL veg cupboard to HPS tent 5 days after repot
 

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Hettyman said:
Wow thanks for all your swift help.

The chart i'm using and the def pics are the exact same ones I use, thanks chucky, in fact i think it was you that gave them to me originally some time ago :)

Timbo, that's where I got the 6.6pH for Mg uptake

Problem was post transplant, just starting before. They had been in light mix soil for 4 weeks (6 weeks old in total, but first replant at 2 weeks). Fed in the original soil using BioBizz range, but not in the new soil.

Just found these pics of just before and just after repot, no real signs of def's there. They also went from a CFL veg cupboard to HPS tent 5 days after repot
Click to expand...
Sorry, went to get a couple more shots.
So, they are in the round (3 gal.?) pots now, correct?
In the pics, the way it's only a couple lower leaves, almost looks like a nute splash, but you say you haven't fed since the problem started...........
It might be an N def. like you mentioned, but I don't think so.
Have you checked you runoff PH?
 
Those pics are the most recent I have, and don't show the N def, and yes you're right a little nute splash from feeding. They were just to reference that the def's have started since the re-pot. You can't see form those pics, but there was def a Mg def at that point.

I'm pretty sure that watering at 6.6pH the next couple of times will sort things, then i'll start adding a little nutes

And yes, the bigger round pots are after transplant, and they are 9.5 litres
 
Thanks, i'll update after next watering. This is my biggest grow yet, and first under a 400, so don't want to mess it up with school boy errors
 
So a couple of days on, and a further 500ml each of water at 6.6pH, and things are lookng better, growth spurt, slightly darker leaves but still a little pale. I'm gonna give them a heavy water tommorrow as the soil looks over dry, and the pots aren't as heavy as they should be in my mind, leave it a couple of days and then start 500ml bottom feeding with 1/4 nutes, and repeat every 2 days, working up as I go.

Already running out of room under my 400, so in a few days when more space becomes available under my 250, 2 of the bushier ones will be going under that.

Please excuse the blurry pics, they are only to demonstrate the purple stems of Mg def, which they do...just
 

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Have you had good luck bottom watering? I'm not knocking it, just curious, because I have only heard of it a couple times.
Personally, I would rather top water, that way I can slowly pour, and soak the whole pot, and just wait for the runoff to let me know it's enough.
 
Bottom feeding is something I am about to try for the first time, after talking to the hydro shop man, and one of his customers who has 20 years experience and swears by it. The shop guy explained that the bottom roots soak up all the mix the need, while the top remains dry enough for those roots to get oxygen. Every 3rd or 4th watering will be pure water, and top fed and allowing a little run off, to help stop salt build up. I have found mixing up some plain water drinks benificial in plant health and taste.

Previously I have always top fed with the same rules as you, but with these air pots, i'm finding that getting the edges of soil wet very difficult, and hoping that the soil will soak up the water evenly across the pot
 
Hettyman said:
Bottom feeding is something I am about to try for the first time, after talking to the hydro shop man, and one of his customers who has 20 years experience and swears by it. The shop guy explained that the bottom roots soak up all the mix the need, while the top remains dry enough for those roots to get oxygen. Every 3rd or 4th watering will be pure water, and top fed and allowing a little run off, to help stop salt build up. I have found mixing up some plain water drinks benificial in plant health and taste.

Previously I have always top fed with the same rules as you, but with these air pots, i'm finding that getting the edges of soil wet very difficult, and hoping that the soil will soak up the water evenly across the pot
Click to expand...

i have the exact same problem with air pots... when you try water the edges it just flows out the sides even worse when its dry. how do you exactly bottom feed? put the bottom of the pot into a tray of nutrient solution and leave for a bit? sounds like its worth a try!
 
Honestly, I don't know for sure. I'm hoping the holes in the sides of the airpots soaks in water too. I'm new to airpots as well, it may be benificial that the edges are dry, I have an article in a ganja newspaper somewhere, i'll have another read and refresh my memory.

I find my plants usually take 500ml every 2 days, in the top, and I plan to pour 500ml in bottom feeding trays (bought a few cos they were only a couple of quid) and hope that the plants soak it all up within a few hours under the light.

I'll update on bottonm feeding when I have read more
 
So I just read, alternating top and bottom feeding will ensure a good even rootball. Both methods have arguments for and against, and from my experience of growing, and my environment, I think that top watering and bottom feeding is best for me. But we'll see :)
 
Hettyman said:
Bottom feeding is something I am about to try for the first time, after talking to the hydro shop man, and one of his customers who has 20 years experience and swears by it. The shop guy explained that the bottom roots soak up all the mix the need, while the top remains dry enough for those roots to get oxygen. Every 3rd or 4th watering will be pure water, and top fed and allowing a little run off, to help stop salt build up. I have found mixing up some plain water drinks benificial in plant health and taste.

Previously I have always top fed with the same rules as you, but with these air pots, i'm finding that getting the edges of soil wet very difficult, and hoping that the soil will soak up the water evenly across the pot
Click to expand...
My fault, I didn't even see the air pots in the pics.
How do you like them, I've heard only good things about them.
 
Well I used a different style air-pot as a trial first, and was really impressed. I started using them, cos due to space, I often re-pot close to flip, and realise that root development slows down after first couple of weeks of flower, and wanted the roots to get round the pot as much as possible, to prevent damp spots.

I bought the other style for this grow cos they seem more sturdy and better sized and shaped.

The 3 Blu Myst went from 6.5 litre to 9.5, and the Aurora's went from 2 litre, to 7.5. Within 2 weeks, all roots have reached the bottom of the pots in a big way, and I can see that they have reached the edges all round.

When I harvest the one in the art-deco looking pot (don't currently have a pic of this available, but it's it one of these http://www.ebay.co.uk/itm/SUPEROOTS...arden_PlantsSeedsBulbs_JN&hash=item35c133629b), i'll let you know how the root ball developed, I love breaking the soil open and seeing whats what :)

I also use Hesi root complex after re-potting, and if I veg for a long time... seems good
 
is that a disco ball in your tent? i want one of those. also dry around the edges to a point is fine im sure my plants don't mind if fact when i transplanted to the 5 gallon dirt pots i put 1/2" -1/4" of black gold perilite in the bottom and mixed the rest of the bag in with the new transplant soil so it drains faster and pulls moisture outward. i noticed it made my humidity a little harder to control after watering though because the water is evaporating out of the pot faster. https://www.rollitup.org/grow-journals/565696-9-dynamite-clones-led.html im also having a similar nute problem, i think my ph is off a little so i started going a little more acidic with my water because i was using plain king co water. it seems to be helping
 
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