Marijuana grow, switched from MH to HPS, now leaves are burnt


#1

A question from a fellow grower:

I’m writing this letter because few days ago i found a bad surprise on my plant’s leaves.
Nobody is able to understand which could be the reason.
I describe you my growbox details.

120 x 120
600 watt hps
25 celsius
40%humid

Unfortunatly i coudn’t acheve a taller humidity during my veg period that i switched to bloom just yesterday.
I guess that the problem could be caused by the fact that i’ve switched from MH to HPS without moving the bulb further than before.
And so i guessed it could be a burning problem, added to the clime too dry.


#2

Move your light up if it feels hot on your hand it feels hot on your plants Glaire.

Will


#3

Changing lamps should not be the issue. However; If you changed photo periods and the plant stretched taler in a couple days; You could be too close. It is not merely the lamp change.

Fill this out and we will have another look. :wink:

Seedbank used:
Strain:
Indoor or Outdoor?
Size of space:
Soil or Hydro?
Medium used:
PH:
EC/TDS ppm levels:
Temperature:
Humidity %:
Light system/watts?


#4

It’s 7 critical kush under 600watt hps in a 120x120 growbox
I always keep ph level between 6 and 6.5
The temp is around 23’celsius and humidity 60%
I’ve fertilized the plants with bio roots for the first 2 weeks,
Alga grow just for veg xiod and i always use hesi sux vit once a week for all plant’s life.
From the first day of bloom xiod i start with alga bloom plagron 2times a week.
Unfortunatly i don’t measure ec and tds


#5


#6

This is 8th bloom day
The problem seems to be overtook


#7

OK. Issues I have with your regimen:

  1. PH for hydro is 5.8, PH for soil is 6.5. ^.0-6.5 is too high for hydro; Too low for soil. This could be the start of the issue. Do you grow Hydro or Soil?

  2. I have never heard of the nutrients you are using. Perhaps if you posted a link to the info, we could look at it, and give you an opinion.

  3. I am not sure what you mean; “The problem seems to be overtook”? Hard to tell anything is wrong with the yellow overtones from your lamp.

Awaiting your reply. Peace