Please help a novice in distress

[BillyBanchan]

the exterior tips of the leaves are a problem, look at your steps and go over it then you'll see, I see them all the time, I can't help you b//c when you try you get blamed, so I'm staying out, b/c I see them die & they go ballistic, too many issues not enough of what could be the issue, can from overwatering to over fertilizing

Um, what?

 

[IsanFarmer]

Can you do a lights out flash on photo?
Just quickly turn light off take photo.with flash and turn lights on again.
Cheers

What do you mean? Take a photo when the grow room lights are out and it's dark? The lights are off now and it's the dark cycle because it's after 1800 where I am, so do you want me to take a photo in the dark for you?

 

[Trash_2002]

80 degrees at 50 RH is already tipping into stomata closure. For mindless control of VPD, 80/60 for 1.3ish VPD. 50 RH at 80 and you’re pushing over 2.0 VPD = no transpiration. To be in the 40-50 RH zone, you shouldn’t touch 80 degrees. I follow my VPD meter vs any chart, as the charts are all different and the VPD numbers are way off from sensor readings.

Without leaf surface temperature reading you only getting air VPD, witch is always higher than the leaf one. Leafs heat different in different leds lights too and usually are 0-3c lower than air temp, usually, it depends greatly on enviro and etc.

 

[Trash_2002]

What do you mean? Take a photo when the grow room lights are out and it's dark? The lights are off now and it's the dark cycle because it's after 1800 where I am, so do you want me to take a photo in the dark for you?

Not in the dark cycle, in the lights on cycle.
So you don't disturb your night with a flash ;-)

 

[IsanFarmer]

Not in the dark cycle, in the lights on cycle.
So you don't disturb your night with a flash ;-)

Sorry I misunderstood and I've taken a photo in the dark now which is not good. I might as well post it now, maybe it'll help. I hope the light leak and camera flash from that shot doesn't fuck my plants up? How much damage could it do? Maybe I shouldn't have smoked that spliff earlier. You're getting me right at it with your cryptic syntax and this is funny as fuck now.

I think that Bdubs might be right and they're suffocating because of the VPD? The leaves look really droopy when it's dark. I'm yet to work out how to calculate and monitor VPD but I'm on on that train later. The temperature where I am during the day is insane right now, it's around 38 degrees Celsius for 12 hours of the day and it's hard to keep the room cool then. I think this is all connected to the fact that I'm exhausting the hot air from inside the tent back into the room, so maybe they're not getting enough fresh air? My AC unit is a mini-split so it just recycles the same air in the room and keeps it cool, surely the way I have things set up means it's fighting against the hot air blowing back into the room from the tent?

 

[Stokes]

What do you mean? Take a photo when the grow room lights are out and it's dark? The lights are off now and it's the dark cycle because it's after 1800 where I am, so do you want me to take a photo in the dark for you?

Lights out pics are the best way to spot deficiencies in your plants and get an overall picture of plant health. Everything seems to show up.

 

[TLOnewbie]

I'm currently on day 18 of my first grow. I'm growing 2 Hindu Kush and 1 Northern Lights. I started in plastic cups but the Hindu Kush plants became root bound so I transferred all of the plants 3 days ago to 5 gallon pots. My plants look quite healthy but the problem I have is that they don't seem to have got any taller in the last week. If you look at the close up photos you'll see that the Hindu Kush plants have a whole bunch of nodes in the same place which I can't understand. Also, the Northern Lights plant seems so small compared to the others even though this is also an Indica strain. What am I doing wrong? I was thinking that I might need to top the two Hindu Kush plants because this is causing the problem with the node bunching but aren't they a little small to be topped now?

I'm using a Mars Hydro FC-E4800 at 24" and 50% power. 18 and 6 hours. The temperature and RH is constantly 76 to 80 Fahrenheit and 50% to 70% respectively. I've got three fans on constantly. Two oscillating fans, and a 6" Spider Farmer exhaust fan on speed 3. Everybody says it's better to underwater than overwater but I think I may have underwatered too much and this has stunted their growth? I've been using molasses and liquid seaweed to feed them and I've just given them about 2 litres of water each. I've just ordered the Fox Farm nutrients trio and some Cal Mag and they should be delivered in the next few days so I'll start using them as soon as they come. Why do my plants look like this or are they normal at this stage and I just need to be patient?

Hello
I offer that nothing is wrong.
It takes 7 to 10 days for your plants to adjust to their new pots.
Patience
Everything looks great

 

[smallgrower]

I'm currently on day 18 of my first grow. I'm growing 2 Hindu Kush and 1 Northern Lights. I started in plastic cups but the Hindu Kush plants became root bound so I transferred all of the plants 3 days ago to 5 gallon pots. My plants look quite healthy but the problem I have is that they don't seem to have got any taller in the last week. If you look at the close up photos you'll see that the Hindu Kush plants have a whole bunch of nodes in the same place which I can't understand. Also, the Northern Lights plant seems so small compared to the others even though this is also an Indica strain. What am I doing wrong? I was thinking that I might need to top the two Hindu Kush plants because this is causing the problem with the node bunching but aren't they a little small to be topped now?

I'm using a Mars Hydro FC-E4800 at 24" and 50% power. 18 and 6 hours. The temperature and RH is constantly 76 to 80 Fahrenheit and 50% to 70% respectively. I've got three fans on constantly. Two oscillating fans, and a 6" Spider Farmer exhaust fan on speed 3. Everybody says it's better to underwater than overwater but I think I may have underwatered too much and this has stunted their growth? I've been using molasses and liquid seaweed to feed them and I've just given them about 2 litres of water each. I've just ordered the Fox Farm nutrients trio and some Cal Mag and they should be delivered in the next few days so I'll start using them as soon as they come. Why do my plants look like this or are they normal at this stage and I just need to be patient?

So my friend, I think I'm going through the same problem as you. And I could be wrong but it could be related to the light intensity. As I grow autoflowers plants, I changed the schedule very early, I started with 12 x 12, and I changed to 18 X 6 very early, and the led panel was a little low. The result was low plants with super vigorous stems, but they were small. I cultivate in inert soil with coconut powder, and use mineral fertilizer with Plant Prod and Calcium Nitrate. I control the EC and this isn't the first time I've started cultivation like this. And as I said, I really think the problem was too much light at the beginning. And I don't know if it's possible to see in the photos, how the stems of the plants are very thick. I hope I could have helped you.

 

[Trash_2002]

Sorry I misunderstood and I've taken a photo in the dark now which is not good. I might as well post it now, maybe it'll help. I hope the light leak and camera flash from that shot doesn't fuck my plants up? How much damage could it do? Maybe I shouldn't have smoked that spliff earlier. You're getting me right at it with your cryptic syntax and this is funny as fuck now.

I think that Bdubs might be right and they're suffocating because of the VPD? The leaves look really droopy when it's dark. I'm yet to work out how to calculate and monitor VPD but I'm on on that train later. The temperature where I am during the day is insane right now, it's around 38 degrees Celsius for 12 hours of the day and it's hard to keep the room cool then. I think this is all connected to the fact that I'm exhausting the hot air from inside the tent back into the room, so maybe they're not getting enough fresh air? My AC unit is a mini-split so it just recycles the same air in the room and keeps it cool, surely the way I have things set up means it's fighting against the hot air blowing back into the room from the tent?

oh well it happens, stoner brainfart, one little flash like that is "ok", but don't disturb night time anymore .
droopy at night is ok they are sleeping.

All the plants shows the same thing, tops are very yellow and turning very fast, your last update wasn't nearly as yellow as that...
humm looks like to be environment linked, too much light and maybe too hot and too dry.
how quickly the soil is drying? next time go with 2 gal pots than one week before flower go to 5 gal pots.
Its not iron deficiency.
Could be a sulfur deficiency but its so rare and looks a bit different, and wouldnt show on every cultivars at same time tho.

my gut tells me its environment linked.
how far away the lights are? go even further away. i see some intervenal leaf burns they arent liking 570ppfd, go with 400-450 max for this first weeks to see if they start to recover. (i warned about that multiple times tho)

next feed go 1/2 strenght

 

[Trash_2002]

one thing, how your nights are drier than your days? never seen that in my life but i never went to any desert region too.
I would have thought Thailand would have more humid air at night, are you too far away from the ocean where you live?

Your problem its 99% sure to be too much light and probably also environment related (Temps/RH).
those modern leds bars diodes are strong ass bitches, have to be on top of it to prevent light burn.
@IsanFarmer what intensity percentage your lights at? you could easily go 75% (360w) at 3 feet+ from plants.

 

[IsanFarmer]

how quickly the soil is drying?

Not as quickly as I thought it would after I flipped them. 4 days. They had their first 12 hour light cycle on Monday and I watered them that day too. I was expecting them to need a feed by Thursday but the soil was still moist then so I fed them today instead. 4 days for the soil to dry out at this stage seems quite long?

how far away the lights are?

The shortest canopy is 30 inches away and getting 460 PPFD and the tallest canopy is 23 inches away and getting 570 PPFD.

one thing, how your nights are drier than your days? never seen that in my life but i never went to any desert region too.
I would have thought Thailand would have more humid air at night, are you too far away from the ocean where you live?

Your problem its 99% sure to be too much light and probably also environment related (Temps/RH).
those modern leds bars diodes are strong ass bitches, have to be on top of it to prevent light burn.
@IsanFarmer what intensity percentage your lights at? you could easily go 75% (360w) at 3 feet+ from plants.

I'm a bit baffled with the humidity thing too. I always thought Thailand was a very humid country because you always feel sticky but that doesn't seem to be how it is in my grow room. The RH right now is actually 43% and that's just after nine in the evening when the lights have been out for 3 hours. We are over 300 kilometres from the ocean where we are. The light is at 75% as far as I remember, I'll check again in the morning. I'll raise the light in the morning and decrease the intensity too. If that doesn't work I think it is environment related.

 

[Trash_2002]

Not as quickly as I thought it would after I flipped them. 4 days. They had their first 12 hour light cycle on Monday and I watered them that day too. I was expecting them to need a feed by Thursday but the soil was still moist then so I fed them today instead. 4 days for the soil to dry out at this stage seems quite long?



The shortest canopy is 30 inches away and getting 460 PPFD and the tallest canopy is 23 inches away and getting 570 PPFD.



I'm a bit baffled with the humidity thing too. I always thought Thailand was a very humid country because you always feel sticky but that doesn't seem to be how it is in my grow room. The RH right now is actually 43% and that's just after nine in the evening when the lights have been out for 3 hours. We are over 300 kilometres from the ocean where we are. The light is at 75% as far as I remember, I'll check again in the morning. I'll raise the light in the morning and decrease the intensity too. If that doesn't work I think it is environment related.

Requiring more water its not instantaneous after flipping but next weeks they gonna start drinking much more, gradually.

 

[IsanFarmer]

Some compromises has to be made, off course, but it works great, normally my AC is set to 23-24c
Clone box with 45w twister fluorescent lamp stays at 24-25c 60-65rh
Veg with 260w LEDs stay 25-26c 55-60rh
Flower with 520w LEDs (80%) stay 26-27.5c 50-55rh
Room stay 22.5-23.5c 50-65 Rh, and I dry inside the same room too LOL

Not bad at all tho. Every tent because it has different wattage and different amounts of controlled passive intake has its own temperature and humidity range.

This flowering tents was a custom order from a friend who has a growshop in my city.
But you can find premium 1600d nylon with diamond mylar tents on ebay or AliExpress i think.

Do you have a vent on the door for your grow room to allow passive air intake, or do you just rely on the air exchange created when you go in and out of the room?

 

[Trash_2002]

Do you have a vent on the door for your grow room to allow passive air intake, or do you just rely on the air exchange created when you go in and out of the room?

Not a installed vent tho but fresh air get in through the door spacing underneath.
The room extraction fan makes negative pressure in the room and pulls air from there.

 

[Bdubs]

I have a 2x2 veg tent in the same room. Blowing air out into the room. I have ports open for incoming air. I have light reflecting out and into the corner of the room. I have flowering out in the open room. If you cant read a book at the plant,

 

[Bdubs]

Dim light shouldn’t be a problem. I like the idea of reducing the reflection as Trash2002 was talking about.

 

[IsanFarmer]

Not a installed vent tho but fresh air get in through the door spacing underneath.
The room extraction fan makes negative pressure in the room and pulls air from there.

Do you think a vent for the door of my grow room similar to this would be a good idea? If there was negative pressure in the room then it would constantly suck in fresh air. I could cover the inside vent with some sort of fabric to keep out pests.

 

[IsanFarmer]

My EC pen was delivered two days ago. The instructions say I have to soak it in distilled water before I calibrate it but I don't have any. Instead of distilled water is it alright to use the KCI storage solution that I use for the same purpose when I calibrate my PH pen? It also says I need to calibrate it with a 12.88 EC solution but I bought 1.413. Surely it doesn't matter what you calibrate it with as long as the calibration solution is what it says it is? I thought I'd use the pen for the first time to check this solution and it gives a reading of 1.28 instead of 1.413. Is it normal for a cheap EC pen like this to be a little inaccurate and it'll be ok once I calibrate it?

 

[Mikedin]

My EC pen was delivered two days ago. The instructions say I have to soak it in distilled water before I calibrate it but I don't have any. Instead of distilled water is it alright to use the KCI storage solution that I use for the same purpose when I calibrate my PH pen? It also says I need to calibrate it with a 12.88 EC solution but I bought 1.413. Surely it doesn't matter what you calibrate it with as long as the calibration solution is what it says it is? I thought I'd use the pen for the first time to check this solution and it gives a reading of 1.28 instead of 1.413. Is it normal for a cheap EC pen like this to be a little inaccurate and it'll be ok once I calibrate it?

What’s your solution temp at?

Not sure if it’s a .2 difference but worth a shot to test at 25c?

I don’t check EC or even PH anymore so I’ll let others chime in with more experience in the field

Also yes the cheap pens be it EC / PH will never be as accurate as a bluelab etc but it’ll “keep ya honest” and give ya a basic range

 

[ILgrower]

What’s your solution temp at?

Not sure if it’s a .2 difference but worth a shot to test at 25c?

I don’t check EC or even PH anymore so I’ll let others chime in with more experience in the field

Also yes the cheap pens be it EC / PH will never be as accurate as a bluelab etc but it’ll “keep ya honest” and give ya a basic range

why do you need instruments by keeping it in check haven't you mastered the art yet?