Planting for the first time, growing slowly, please help

CN-man · Jul 5, 2019

I have asked this question before when these plants are 20 days old.

I added perlite ventilation and better lighting. Feeding about 200PPM of nutrition.
The situation has improved a bit, but now she has not grown up. This makes me very confused, I don't know where I am doing wrong.
The light is CREE CBX3590 70W. I only water the coconut soil when it is half dry. PH value 6-7 (I am not sure, my test instrument seems to have problems).
Their leaves don't seem to grow much. Like they have dwarfism

CN-man · Jul 5, 2019

My English is not very good, I hope you guys can understand what I am talking about.

macsnax · Jul 5, 2019

Bump it up to 300ppm at a pH of 6.3. And feed more often, coco is different than soil. You don't want the top layer of coco completly drying out.

Obepawn · Jul 5, 2019

PH is too high bro. For coco you should be around 5.5-5.8

CN-man · Jul 6, 2019

macsnax said:
Bump it up to 300ppm at a pH of 6.3. And feed more often, coco is different than soil. You don't want the top layer of coco completly drying out.

So now I have to feed more nutrients and lower my PH value?

CN-man · Jul 6, 2019

Obepawn said:
PH is too high bro. For coco you should be around 5.5-5.8

Thank you, so you think this may be a PH problem?

hellmutt bones · Jul 6, 2019

Check ph

macsnax · Jul 6, 2019

CN-man said:
So now I have to feed more nutrients and lower my PH value?

Ya for the most part I run at 6.3 in coco, plants are very happy.

principlesarelife · Jul 6, 2019

What are leaf temps? How's the air flow in your grow space? What's your relative humidity?

CN-man · Jul 7, 2019

principlesarelife said:
What are leaf temps? How's the air flow in your grow space? What's your relative humidity?

I removed the tent. Opened the window.
Then the temperature is 30-32 degrees Celsius. A little hot
Humidity is 50-60%

CN-man · Jul 7, 2019

macsnax said:
Ya for the most part I run at 6.3 in coco, plants are very happy.

I corrected my PH test pen. After watering PH5.8, the water came out at pH 6.3. PPM230. Now I don't think it is a problem with PH...

CN-man · Jul 7, 2019

principlesarelife said:
What are leaf temps? How's the air flow in your grow space? What's your relative humidity?

China is now summer with an average temperature of 30 °C. I live in the subtropics. I can't think of a way to lower my temperature. I can only add two more fans.

principlesarelife · Jul 7, 2019

86-89.6F is really hot. You'll need to up the humidity & if possible keep it from going past 30c

principlesarelife · Jul 7, 2019

https://www.questclimate.com/vapor-pressure-deficit-indoor-growing-part-3-different-stages-vpd/

Paste the formula (towards the end of the article) into excel & plug in your grow environment variables to calculate your plant's transpiration. I think it's supposed to be between .4-1.2 with .8 being optimal.

If you up your RH you'll need effective ventilation or mold will become problematic.

macsnax · Jul 7, 2019

The thing is that I can see your coco is dried out. Your temps aren't favorable either, but letting coco dry out is a big no no. You'll see twisted leaves and a variety of other issues.

CN-man · Jul 7, 2019

macsnax said:
The thing is that I can see your coco is dried out. Your temps aren't favorable either, but letting coco dry out is a big no no. You'll see twisted leaves and a variety of other issues.

Thank you, yes, the leaves have become light green and look even white. So now I need to increase the humidity or lower the temperature. is this correct?

CN-man · Jul 7, 2019

principlesarelife said:
https://www.questclimate.com/vapor-pressure-deficit-indoor-growing-part-3-different-stages-vpd/

Paste the formula (towards the end of the article) into excel & plug in your grow environment variables to calculate your plant's transpiration. I think it's supposed to be between .4-1.2 with .8 being optimal.

If you up your RH you'll need effective ventilation or mold will become problematic.

Thank you for your help, but, sorry, my English is very bad, I looked at the formula, I can't understand.
So How much humidity do I need to increase when the temperature is 89F?

principlesarelife · Jul 7, 2019

the formula is copied & pasted into microsoft's program, excel

ideally, you'd want a heat gun to read your leaf temps to determine how hot or cool your plant is

i'll make a conclusion by basing it off:
the VPD formula
my room's conditions of +4 degrees Fahrenheit of leaf temp from grow room temp

89f air temp
93f leaf temp
you'll want 96-97% RH with good air flow for the optimal .78-.83 VPD range

at that high of RH you're at a higher risk of mold & powdery mildew. that can be negated with effective grow room ventilation

that's just so dang hot for your babies, man. if you can get a humidifier & some fans to gently blow the humidifier's cool mist straight onto your girl, that will help with your hot temps

macsnax · Jul 7, 2019

CN-man said:
Thank you, yes, the leaves have become light green and look even white. So now I need to increase the humidity or lower the temperature. is this correct?

Ya let @principlesarelife get you squared away on your vpd, and don't let the surface of the coco dry out. You'll be on the right track then.

BadAssBill · Jul 7, 2019

macsnax said:
The thing is that I can see your coco is dried out. Your temps aren't favorable either, but letting coco dry out is a big no no. You'll see twisted leaves and a variety of other issues.

I'm new to this as well, can you explain why it is so bad for coco to be drier?

Planting for the first time, growing slowly, please help

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