Diagnosis Help

I am having some issues with my plants (i need to know what the problems are & suggestions of solutions) here is some background:
Outdoor - greenhouse,
Fan blowing 24/7,
low humidity,
gets very hot during day,
past week only 8 hours of sunlight per day rest is in shade (moved now),
occasional flying insects in greenhouse (i kill them when i see them),
soil has very low PH (run off is always much lower than put in),
water via pot (no spray, no bottom feeding (sucking up)),
1 in flower, other 2 still in veg,
all same strain; an auto flower,
for veg giving them all these nutes that have n-p-k : 10.6 - 1.9 - 1.4.
Only just got flowering nutes so until now flowering 1 has been on only water since veg stopped.
1 Previous mite infestation but sorted it & none of these problems were present back then.

Issue 1 :
very light green leaves im guessing this is ok & is just new growth but not 100% as it has a slight yellow in it.



Issue 2:
White residue/stain on leaves; now ive tried too wipe bits off & it takes some doing to get off, so its not very wet or liquidy.


Issue 3: Yellow spots on leaves; im guessing this is some insect/mite problem however i haven't seen any on the plant.


Bud Q: this isn't so much an issue, im more curious as to when i should harvest & how long they look like they have left?
Will they get bigger? Will those white hair looking things curl inwoods & form a proper bud?
When should i harvest? when just over half of those white things have turned orange?


I chopped the top bud off as most of the hairs turned orange i now reckon this was a mistake.

Issue 4: is this sun burnt or a different issue?


Final Q:
Its an auto flower & for the one flowering is it worth chopping big fan leaves off so more light can get to the buds or will this cause the plant to stress too much & thus make it pointless?


Any help with any of them would be appreciated,
Cheers Gr0wC0d3

are you giving any cal/mag?

i think you still have a mite problem.

do not cut off top buds until the plant is ready for harvest.

i wouldn't chop any fan leaves unless you really have to.

the buds will swell up a lot near the end so be patient. i would plan on another 6 weeks anyway, but the plant is done when it's done.

Youi have the beginnings of a mite problem. Safer's soap will knock them down. Slow down. You'll KNOW when to harvest. Take care not to get liquid nutes on the leaves. Get a 30x jeweler's loupe to check Trichome color. All cloudy with a few amber trichomes is good. With experience you'll discover what you like.

Thank you both
I haven't sprayed the leaves with anything & none of the leaves get any water or nutes on them.
So soap & water to get rid of mites? will it be ok to put this on the one in flowering or just the 2 in veg?

Im not sure they may be get very small traces of cal/mag but not much if they do.
Should i get some more nutes that has a lot of them in?

Definitely spider mites...Mighty Wash will work too. Spray all the leaves on top and underneath after the lights go out or the sun goes down.

Just sprayed them; soapy water first then plain water after on all of them (drenched both upper & under) hopefully this helps but i checked & i didn't see any mites.

Cheers Gr0wC0d3

The yellowing seems to have got worse on 2 of them

Very bad plant:


Not as bad plant


Going to try a flush to see if that helps


--------------------------------
update

What are the chances of dog wee causing this?
I have just started flushing & the water coming out is distinctly yellow reeking of wee.. :S

Do your nutes contain magnesium? what kind of water are you using? What's the ph of your runoff?

it says contains trace elements so i guess yes but very small amounts.
run off is below 4 when what im sticking in is 7, so yh ph is fairly low

Ph is probably locking out nutes.

i have been putting in water at 6.8-7.2 constantly & the ph hasn't changed much at all in the run off (they are all around the same) around 4 (using rubbish color test will get proper one soon, may even get soil tester) anyway do you know of a good cheap way to increase the PH?

Also i did think that may be the cause of the yellowing until i flushed & noticed my dog wee'd on them :/

cheers gr0wc0d3

The dog piss is probably very acidic. I think garden lime/dolomite lime is supposed to bring your ph back up to more ideal levels. I think 1 tbsp per gallon of water once or twice a month is what is recommended. I'm not sure though. I think have read that somewhere though? Good luck