Since my recent seedlings have not done the best, I have been thinking what was I doing previously to help them to such great success. Then I remembered my C02 making experiment. I was quite successful at raising the PPM's of carbon dioxide in the grow tent, by feeding yeast sugar. So I am adding it back to the routine.
High levels of C02 can really boost a plants ability to photosynthesize, and since my plants seem to be having trouble doing that right now. I figured giving more may help.
It smells like beer, pretty much how you make it. But I have no interest in drinking this.
Seems like the leaves are curling back less, so I hope this is a sign that the plants are restoring themselves. And hopefully using the added C02.
All I do to make it is mix yeast and sugar in hot water.
Measuring out 2 cups of sugar and 1 teaspoon of yeast will make a C02 producing mixture for a few days.
I may add more ingredients to this to help feed the yeast better, such as molasses. Other things I can do to help the yeast is to adjust the PH levels of the water down to around 4.6 which helps the yeast thrive.
Experimenting with different kinds of yeast is interesting. I bought some "turbo yeast" which is used to make alcohol. And have used bakers yeast which is used to for making breads and such. They have different smells but not really sure if one is better than the other for making C02.
Sugar levels can speed up how fast the yeast grows.. but it would seem one of the big issues is the yeast dies off as the alcohol level rises in the water and sugar mixture. This is a normal byproduct of the yeast making C02, but will kill it off eventually. That is where the brewers yeasts do better as they can handle a higher alcohol level before dying off. So depending on the cost compared to the bakers yeast it may be beneficial and last longer per batch.
Hope my cannabis seedlings like their added C02, should see some progress soon if so.