New Grower First grow, have no idea what happend with my plant please help

[Thainewbie]

Hi all, its my first grow and after come back from work(2days away) some of my plant start to turned yellow
Strain: skunk from sensi
Light : cmh 125w / 18/6 hrs
Temp: min28-29/ max 30-31
Humid:60-70%

Rest of my plant is okay just only 2 of this have a problem and i have no idea how to fix it. Please give me some advice or solution

 

[Mañ'O'Green]

We will need more information to help you.

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics!

✂ - - - - - - - - - - -
(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Additional info:

 

[Thainewbie]

We will need more information to help you.

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics!

✂ - - - - - - - - - - -
(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Additional info:

Thank you for your reply will follow your instruction and update

 

[Thainewbie]

Update
Problem: some of leafs start changing yellow, leaf are crispy



Medium/grow method: local brand which mix with bat guano 10%, perlite 20%, earth worm 40%, compost 30%



Feed: and supplements used: cal-mag



water source: tap water left 24 hrs before used



Strain/age: skunk, 65days from seeds



light used: light on 18/6, fans on 18/6

250watt CMH



Climate: light on temps 30-32, light off 28-30, humid 58-70



Additional info: another plant is going good on the same conditions

 

[Mañ'O'Green]

Well it is truly unknown what nutrients and NPK balance is in homemade soil so I cannot help much there. Your temperatures and humidity are too high. You want to shoot for 26 daytime 21 night time with humidity between 40% and 60%. Use the hand test to see if your light is to close or far away. Hold the back of your hand at the top of your plant if it is too hot in 30 seconds move the light up if is is still cool lower the light.

Just looking at the plants they show signs of many possible problems which leads me to think PH is the problem. You need to know the PH in the root zone where it counts. To do this you need a good PH Soil Probe. I reccomend the Accurate 8 (the knock off is ok) or a BlueLabs soil probe. BlueLab makes several types so be sure to get the correct one if you go with them.

 

[Waira]

-- mate, that soil blend isn't going to work, it's not complete for nutrient balance,... that plant looks long term starved, likely secondary and micronute defc. starting up now,... might be too much N too, causing the hooked.bowed leaves, and spindley growth....
.... in-pot pH is always something to monitor, but you need the right tool for this job which I know may not be easily obtained where you are....
You need proper nutrients no matter what, enriched soil that's "water only" is difficult to make, takes time and a lot of materials...

 

[Thainewbie]

Well it is truly unknown what nutrients and NPK balance is in homemade soil so I cannot help much there. Your temperatures and humidity are too high. You want to shoot for 26 daytime 21 night time with humidity between 40% and 60%. Use the hand test to see if your light is to close or far away. Hold the back of your hand at the top of your plant if it is too hot in 30 seconds move the light up if is is still cool lower the light.

Just looking at the plants they show signs of many possible problems which leads me to think PH is the problem. You need to know the PH in the root zone where it counts. To do this you need a good PH Soil Probe. I reccomend the Accurate 8 (the knock off is ok) or a BlueLabs soil probe. BlueLab makes several types so be sure to get the correct one if you go with them.

Thank you for your advice

 

[Thainewbie]

-- mate, that soil blend isn't going to work, it's not complete for nutrient balance,... that plant looks long term starved, likely secondary and micronute defc. starting up now,... might be too much N too, causing the hooked.bowed leaves, and spindley growth....
.... in-pot pH is always something to monitor, but you need the right tool for this job which I know may not be easily obtained where you are....
You need proper nutrients no matter what, enriched soil that's "water only" is difficult to make, takes time and a lot of materials...

Yes!! its not easy here to get a good things for a plant so i have to figured out what is suited for me and thank you for your reply