Advice needed please .. with pics

ok well 550 cfm is a lot I runn like a 1/5 of that .. I know Im low on ventilation .. why I runn it at night and use a air intake from out side to keep the temps under controle ..will buy a bigger vent. next month .. but after 15 inches it just feel way to hot for my hands .. I dont belive air flow woud fix that ..

also most places I read about lighting .. HPS and distance .. tells me to keep it 18" inches away for optimal light .. dunno ?


but we are kind a off topic here

I now know why my bottom leaves and under grow is turning yellow .. to crovded and nearly no light comming down ther ..
but what about my leave tip burns ?

anybody abe to help me out here ?
when I read them guides about pant problems they tell me it could be one of either thing .. to much water .. to littel water .. to much nutriense .. or missing sumthing .. or light burn or heat .. or wind or or or or or ... arrrr !!! its not like it help me much .. I know it can be many things .. but I need somebody with some grow experiance who maybe have some experiance on this and know what can be done to find out what it is and to fix it in the end or atlest know how to deal with it on my next grow ..

Ooh yea and thanks a lot for all the input so fare ..

Ey buddy. I don't even think that's the very VERY beginning stages of nute burn. I think the pots got just a little bit to dry before one of the last waterings in the last week or so, am I right? That just happened to some of my lower fan leaves...pots got a little too dry, the bottom leaves get deprived of water first...then they yellow up and start to get crunchy and fall off within a week or two. It could also explain the tips of the good leaves yellowing a little.

But yea, they'll also yellow up and sometimes die like that from not getting light. But is it happening on your LST and your FIM plant?

hhmmmm maybe ?

so under watering .. could actualy be spot on .. since Im sure I did`t over water and pots did feel light one morning a week or so ago ..
a bit surprised as Im not use to water so much .. but as they are bigger and under a HPS and have high heat it could easily be a good explanation ?

is it normal for leave tips to get lightgreen and then brow if it is under watering ?

and yea look at my fist pics in this thread .. a few (4 or so) bottom leaves on the FIM plant did go completly yellow/brow and dry .. but they did`t get much/any light either .. like a million leaves between them and the light

As far as the light not getting down there, there's an easy way to figure out if that's why the leaves turned yellow and died....are the leaves directly above the leaves that turned yellow healthy? Aside from the little bit of brown you're seeing on the tips? If the leaves right above those are healthy, it's probably not because they didn't get enough light. Plust I grow mine to 3' sometimes and only lollipop up 6 inches, and my bottom leaves don't turn yellow and die off from not getting light. They do however turn yellow and die sometimes from spider mite damage, and from forgetting to water when the pots are already a little dry.

So I don't mean it's from underwatering as in you haven't been watering enough, I just mean that the pots were probably dry enough to get water, and then went an extra day or so without it to where the bottom leaves start to droop down a little. You might not notice it and just water anyways, as it takes another half of the day depending on if the plant is root bound or not.

So if you water a day late, or even half a day late, sometimes those bottom fan leaves just don't recover, and then add to it that they aren't getting sunlight, and you have a cocktail for dead leaves.

ok .. well I removed them now .. and did some more lolipoping aswell ..

and Im 99,9% sure your tight .. about the water "shortes" as its only my FIM plants (the fast growing one) that had yellow leaves ..
and that is also the one who use most water .. need water like evry seccon day or so .. other one only need water like evry 4th day ..

the FIM plant its bigger ...grow faster and have been in the big pot for longer time .. and the runn off do go faster trough then when I water the other plant ..

There we go.

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See, mine just did the same thing, except probably a little worse than yours, as I went a whole day too long without watering. But the top of my canopy still looks awesome. I still have to take of some yellow leaves and some crispies...

yea boath pics look exatly like mine ..

so nothing to worry about I guess... just normal signs the plant show you ..
I guess it use its water from them lower fan leaves ? before the plant acctualy drops and look "tired" allways thort that was the fist sign ?
guess I did`t notice yellow leaves and tip burns back then ..

Ooh well all is good ...and I also got a few things to day

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kitchen ventilation (100mm and 100M3/hr) cost me like 15$ ..

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and some tubeing .. cost me more then the ventilation

so now I can make a prober fresh air intake ..

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allready made a intake "box" you know .. behind it ther is a 20x2 inches opening to the out side .. cleard it from all the filters and stuff and did only fit some stainless stell netting (200 my) hope that is enough to keep bugs and stuff out ?

also made a box around my intake to my grow room ..

will connect it with the tubeing/ventilation so it pull fresh air in to my 600W HPS

will make a small opening more in the intake box near the floor ... so I can controle temps. and air presure ..

it will be made so I can open or close it to maintain just a slightly negativ presure in the room and just enough fresh/cold air to maintain correct temps ..hope this make my temps drop a few degress .. from 82-84 to 78 would be perfect ?