have i got this wrong?

[bingobango]

So im growing 4 ak47 in bio bizz all mix with full range of ferts,bloom,topmax,grow.I take what i know from aeroponics,this could be the problem.I fill a tank with water from tap and leave over night and check the ph next day,this is normally 6.9 to 7 ph,i then use hydropnic phosphoric acid to bring down the ph to about 6 and put in to sprayer and then add the ferts.I have just tested r/o water and it is 7.4.Am i wrong in bringing the water ph down all the time or should i be just leaving water and buffering soil by some other means,i ask this because my fan leaves have suddenly starting going yellow and crisping up like fert burn but the rest of the plant seems to be ok, slighty yelow not a healthy green and bud growth does seem slightly slower,this only my second grow in soil so all help appreciated.I can get better pics if this would help

 

[GreenBush 420]

How old are your plants? How close are you to harvest? Sometimes this amount of yellowing is normal towards the end of the flowering period. The plant is just using it's own nutrients. If they are only a few weeks into flowering, then you might have a low N situation.

 

[bingobango]

They were on veg for about four weeks and they are on 3rd week of flower,a guy said add alg a mic which i have done twice at 2mls per litre,sorry forgot to mention this,as of yet this has'nt done anything,thanks for speedy reply dude

 

[GreenBush 420]

I would check out the sick plants guide on the front page of the infirmary. It is called "the complete guide to sick plants." Check out the first section on Nitrogen deficiencies.
I'm not an expert on soil grows, but I would start there. The plants look pretty healthy otherwise, maybe they just need a boost of N-ergy!

 

[HeadyPete]

Yep add some N. Those lower yellow leaves are N deficient. As Bush said, plants move away from N in flowering and slow and even leaf yellowing is normal over time. Next round increase the grow fert to 2ml/L until about 2 weeks into bloom, then back off to 1ml/L. I use BioBizz and the Grow is pretty gentle, 1ml/L is borderline enough N for my plants. Are you feeding the grow right to final flush? You should, as it has all the K and if your plants are K deficient the harvested bud will not burn hot enough and will keep going out in a joint.

Now, if those upper leaves are yellowing but the veins are staying green then that's magnesium def. Feed 8ml/4L CalMag a couple times until they green back up.

Can you post some close ups of the upper growth with regular lighting, not HPS light?

 

[bingobango]

will get pics now dude.Just to say ive been using all mix for a while with no problems untill this grow,the guy at the shop said that all mix is'nt as good as it used to be and he's had lots of complaints with it.Ive been on aeroponics for years and never had any problems just bud rot.Your probebly right about the fert defficiant but ive been following the bio bizz schedule at 1ml per litre through the whole grow and only on this one has it buggerd up so i put a little fish mix in,cheers dude pics to follow,i might go back to areo who knows

 

[HeadyPete]

The fish mix should help. I really like BioBizz but don't use all mix. I mix 1/4 bag of PreMix dry fert in with one 5kg brick of coco, worm castings, kelp and that's it.

 

[bingobango]

Sorry for the delay on pics put life was calling anyway heres some pics of the ak.Description...Growth of bud does seem to have slowed down,im in fourth week of flower,the main fan leaves have gone bright yellow,but the rest of the plant seems ok maybe not as green as it should be,buds are nice and fluffy and pushing out resin.When the leaf starts to turn it just goes yellow no red veins on leaf but the stem to which it attaches does go red and still is.Two leaves which are about 12inches across on the bottom of one plant went yellow first but have not gone crispy,however on plant they have gone crispy and died.The buds on one plant have also lost the top pistels,i think this could just be fan leaves brushing them off in the breeze?any ideas.Last night i gave them some grow at 2mls per liter some bloom at 2mls per liter and 1ml per liter of topmax and 2mls per liter of the fish,had a look this morning and there not dead.lol.stems are nice and thick and there still drying out my soil so they get water every day at 6pm when light come on and if left to say 7pm then they can get very thirsty,i hope this is enough info iff not please ask and i will try to give more.I know about plants going yello in later life but this is a bit soon and a bit rapid and its just does'nt feel right.headypete you say you only . . mix 1/4 bag of PreMix dry fert in with one 5kg brick of coco, worm castings, kelp and that's it.is this all the way to end or do you add bloom and topmax,please forgive my stoney misgivings and thanks for the info,pics

 

[HeadyPete]

Hi, first ,no more fishmix. 4ml/L of N is a lot for this time of flowering. This dose should help them but from now on only Grow, 1ml/L till the end. It is almost too late to correct a N def at this point, the plant is switched to bloom mode and is looking for P and K for flowering. Overall your plants look nice, and they will yellow more over time. The key is for this to happen slowly over the bloom cycle, not quickly and not where all the fan leaves drop off at once.

My cocosoil is a base, it feeds seedlings and clones for the first 10 days or so, then I use BB grow, bloom, topmax, Floralicious plus (for awesome smell and sweet flavour) and CalMax once in a while. Actually just fried my 3 MountainJam clones some with too much liquid ferts after transplanting. There is blueberry in them and BB is a light feeder. The LUIs I have could take that fert and more. Always learning, this is my first go with mountain jam.

 

[bingobango]

yippee

yippee

Cheers man much thanks for the info,i have stopped the fishmix and have been to grow shop ,nice Bought sensi cal mg mix and mixed some nutrient together also advising me on my ph which is cool,so panic over and thanks againn for advice,shame about the clones heres some hashberry and sadhu in cloner about to get some rizo tonic