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HELP! Help please! First timer with increasingly browning leaves and white growth...

DesperateNoob

New member
Hello, thanks to all of you in advance. I am a first time grower and in desperate need of some advice. I am depending on these plants very much. I live in a non-legal state and have an array of chronic health issues so they are very important to me. I noticed browning and curling of the leaves about 4 days ago. The browning is spreading to all of the seedlings now along with a white substance that is on the clay pebbles and in the rockwool. I have scoured the internet and have come to the conclusion that I may have over-saturated the plants with nutrients, are giving them to much light, or have a fungal infestation. Before I start making changes though I wanted to see what you experts thought.

Strains: Northern Lights and Critical CBD (both from Nirvana seeds)

Medium: Rockwool, hydroponic

Lighting: VIPARSPECTRA UL Certified Reflector Series V300 300W LED positioned ~ 2 feet from the seedlings. The seedlings have been on a 24 hour light cycle since they sprouted.

Temperature: With the lighting and not so great ventilation system the temperature is usually around 84 degrees Fahrenheit. I know this is to hot but I am weary to open the tent for greater ventilation for fear that household pests (mostly fruit flies and fungus gnats) will infect the plants.

pH: pH is maintained ~ 5.7

Nutrient type and schedule:

For the 1[SUP]st[/SUP] week after the seedlings sprouted this is what was given: 2.5 ml FloraGro, 2.5 ml FloraMicro, 2.5 ml FloraBloom, 2ml Hydroguard. This is per 1 gallon. After noticing curling and browning of the leaves I thought maybe it was nutrient burn so the next week the nutrients were quartered.

Week 2: 2.5 ml FloraGro, 1.9 ml FloraMicro, .625 ml FloraBloom, 2ml Hydroguard. The water was changed and these measurements were added 2 days ago. Again I decreased the recommended amount of nutrients by 75% because I was afraid I gave them to much in week 1. The seedlings have continued to brown since this.

What do you all think? Thank you so much for your help and replies!
 

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It sounds like nutrient burn to me. Here is the recommended hydro nute schedule for GH Flora series.
https://www.growweedeasy.com/wp-con...eed-General-Hydroponics-nutrient-schedule.pdf

I've followed this and have had minimal issues and usually the issues were with the ph and not the nutrients themselves. It is a little warm, especially for late flowering but doable and not the issue here. I would try to find a way to help with ventilation esp when you get to late flowering. I agree that getting pests is a bad thing so i would try to prevent that but if there is not enough ventilation in the flowering stage you can get bud rot. You can flower and harvest in those temps but ive found that having mid to low 70's F in flowering produces higher quality resin. I've struggled with temps during the summer because it gets hot and humid where i am.
 
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