So I made a batch yesterday with only molasses and the root pack and foliar pack. 36mL per gallon. Instead of the usual 50mL per 5 gallon. I have a shitload of bennies 24 hours later in the brew.
I did not use any alfalfa or EWC this time, so it is an easier, cleaner tea. I am very impressed with the results to say the least.I also had a discussion with the Dr. who makes these for us, regarding the bennies in hydro applications, and synthetic ferts killing microbes etc.
This is the skinny:
The reason why synthetic ferts are not recommended when using compost teas and beneficials is not necessarily because the ferts themselves kill the bennies. Well, let me clarify, they will at high concentrations. For example, a broadcast of synth N powder will surely kill bennies in the vicinity due to the high concentration of salt.
The main reason why it is counterproductive is that synth nutes do not build a soil, they deplete it of organic matter. How do they deplete? Bacteria are responsible for breaking down organic matter in to usable nutes for plants. If they are eating, and they are not getting food repalced vis a vis organic inputs, then they will eventually deplete all the organic matter and carbon (their food source), and die. This is why if only synth nutes are used the depletion of organic matter will eventually "kill" soil.
So I thought about this, and I thought that in a hydro setting using only synthetics, the bacteria must have a tough time with not much to eat other than the initial tea recipe.... UNLESS we supply them with a food source. Molasses has plenty of carbon and therefore is an ideal food source for the bennies to survive and thrive. Now most people who are experienced in bennies and the soil food web are not experienced in hydro. There is not a lot of info on the the two together. The Dr. and I though are confident that the bennies will be fine in a hydro solution @ less than 5% v/v, as long as we feed them molasses @ 20mL per gal once per week. I know this sounds like a lot, so I will be experimenting with food/population upkeep starting now, and keep everyone posted. I use 5mL per gallon through flower anyway, but I will bump to 20 next cycle to see what effect it has.
Here is a shot of the tea with molasses only @ 36mL per gallon plus root and foliar packs at 1 tbs/gal each :
That's a lot of bennies. If you could see this live it's amazing to see the diversity and the density of the microbes on a single swath.