Help needed!

[kokoshka]

Hi guys! This is my first thread here. I need some help. This is my first auto grow and it seems its not going very well for every plant I have. I am uploading some pics and want advice on what am I doing wrong. One of the plants Maxi gom is realy bad looking. Others have yellow leaves and they are not very tall. I think I overfed them once and when I realised how much it is, I put smaller doses on later feedings and from couple of days things are not so good. Most of the plants are about 35 days old. Temps and humidity are 30C/low humidity, maybe less than 20%/ with lights on, 21C/35% lights off. PH of the solution is 7, which I think also is a problem, runoff PH is also 7. Is it ok if I use couple of drops of vinegar in the solution? Thanks for the help!

Strains:

Afghan Kush Ryder
Maxi Gom
Blue Himalaya Diesel
La Diva
2x Diavolo
MI5

The setup is:

Tent 1.20x1.20x2.0
600w HPS
12L buckets
Biobizz allmix soil and nutrients (grow, bloom, topmax)

I fed them 4 ml/l once before I found this thread - https://www.autoflower.org/f5/biobizz-nutrients-schedule-3987.html

Now Ive been giving them the right dosage, but it doesnt seem to help

Here are some pics:

 

[namvet]

First thing I see wrong is you don't have enough soil in the pots.You have 12 litre pots with only maybe 8 to 10 litres of soil.You do have some nice buds coming and if you started with more soil the girls would be bigger.It looks like nute burn on some so I would pick off the yellow leaves and flush all of them with plain ph 6.3 water and see what your runoff is.At this point I would wait till they dry out again and give them a light feeding of flower nutes at every watering and hope that works.For humidity set out some old baking pans or some sort of large top container and but some cheap sponges in and fill with water that has a little hydrogen peroxide in it or a tbls of bleach per gallon to ward off any bacteria or mold. Set these near your plants and this should help with humidity.

 

[BigBuddha]

35 days old.

And:

Biobizz allmix soil and nutrients (grow, bloom, topmax)

Ok.. the biobizz allmix is probably one of the strongest potting composts around.. ec of about 2.4 IIRC.

If you're sing biobizz soil AND nutes, biobizz claim quite strongly that you don't need to ph adjust because their nutes and soil are perfectly balanced to work together and buffer so that at ph ranges of most tapwater the plants gets the nutes it needs.

Besides, at ph 7 all of the macro nutes are still available in the soil (NPK CAL/MAG etc). Those girls are definitely cooking in that allmix.

You can use vinegar to lower ec, but it evaporates quickly (thus unstable). Do you know what your tapater ph is by the way?

Temps and humidity are 30C/low humidity, maybe less than 20%/ with lights on, 21C/35% lights off. PH of the solution is 7, which I think also is a problem, runoff PH is also 7. Is it ok if I use couple of drops of vinegar in the solution?

30c is a bit high. You ideally want to aim for 23-25 as high temps cause all sorts of issues that many folks overlook as being environmental stress. Even more so now that they're overfed.

To be honest, Nam's advice is almost identical to what I'd do if they were mine. You need to get some salt buildup out of that soil and leave a light bloom feed in there instead at a slightly lower ph, so that as it rises the plant gets access to all the range of nutrients it needs.

The organic nature of biobizz stuff also means that their nutes aren't instantly available to the plant when you feed them, so if/when you do a flush, it can be really useful to make the water you flush with a 1/4 strength nutrient solution.. so 1.5ml/ltr of bio bloom. That way there's some food in the soil right away while the pot is drying out.

The allmix should still have some reserves that'll be available a few days after the flush but that'll get rid of the concentrated pockets and bring the effective EC down.


Ps.. if it were me I'd knock the topmax on the head.. and the grow feed for now and just give them bio bloom.

Now Ive been giving them the right dosage, but it doesnt seem to help

That's because of the above-mentioned way that organics aren't instantly available in the soil.


It's flush 'n' light-feed time baby.

 

[Mellow Yellow]

Dude, PM Muddy or Joe Dirt. They are here to help new growers.

I am still an FNG (F**king new grower) myself. It does look like nute burn, but there ar others who know more about growing than I do.


Hang in there bro... Bud Kharma sent to you and your girls!

I've always been told that you should never give nutrients to your plants two consecutive waterings. I've been told to break them up with plain ph'd water in between the nutes.

 

[kokoshka]

First of all - thanks guys for the quick reply! Second - sorry but I made a mistake with the description. The soil is BioBizz lightmix. Also there's a bucket with water in the tent, but it doesnt seem to change anything. I'll try to get the temp down a little bit. Anyway I watered them today (thats before I posted all of this) with 1 ml Grow, 1.5 Bloom and 0.5 topmax. Do you think I can flush them with the above mentioned 6.3 ph water with some biobloom or just plain 6.3 water? Thanks again!

 

[Muddy]

Looks like you have several things going on here all at once. High soil pH, low humidity and over feeding. I suspect you're getting some nutrient lockout from the pH being too high, then you compounded that by over feeding them. I would suggest you give them a good flush with water pHed to the low 6s and check the pH of the run off. You need to get your soil pH down to the 6.3 - 6.5 range with run off about the same. Also get the humidity up in the 40 - 50% range.

 

[lowcoast grower]

Read your stickys....there is good info in the forum...on self diagnosing your plants....lots of pics and info on how to fix them...this is a good pace to start,hope this helps and good growing bro. :thumbs:

 

[kokoshka]

Thank you all guys! Really appreciate the help! Ill do my best.

 

[kokoshka]

Hi guys! I have another question. The plants look short to me. Should I replant them in other buckets or fill the old ones with more soil? I made a flush yesterday with 6.0 ph water and we'll see if theres any change. I will post pics in a couple of days.

 

[BigBuddha]

I'm of the opinion that it'd probably be best to just leave them as they are this time because a transplant shock will harm the yield. Also, the roots won't grow profusely at this late stage so the new soil will largely be wasted.