Ridgerunner.. Matt on YouTube ..thegrassfactor.. has some good videos about it when used with your fertilizer. Also one with some before and after shots.. Check him out..
The reference in this msu article has a couple of studies.
I'll check those out, thanks.
I'll check it out, thanks.
I'm more interested in the application of humic acids and their effect. Sources and effects of plant hormones and nutrients (kelp derivatives, etc.), I can appreciate.
humic acids alone are just organic acids with lipids. nothing real special as a stand alone product. kelp has a high amount of cytokinins in particular. the benefit of applying the kelp is to increase the presence of cytokinin in relationship to the presence of auxin. Once that greater concentration of cytokinin is present in the plant, an increase in shoot development takes place. shoot development will help fescue or bluegrass have a more "full" appearance, assuming another necessary nutrients are there (humic acid plays into this later). cytokinins also play a role in the plants natural ability to heal itself from damage - avoiding senescence (when a plant ages to the point of potential death).
So with the greater concentration of cytokinin in the plant and all that it entails, the humic acid is there to act as a delivery system for applied nutrients. humic acid (all humic acid extracted in a low pH solution using potassium hydroxide will also contain the smaller particulate make up of humic acid - fulvic acid) will form weak organic bonds with minerals, particularly trace minerals (Fe, Mg, etc) to provide a chelating effect. Once the organic bond is formed, the plant can than more readily use supplemented trace mineral whether through leaf or root absorption. The beautiful thing, is that HA can actually have a chelating effect in soil bound minerals.
In relationship to macros, NPK, humic substances contain a high amount of carbon. the carbon and lipids will work to coat, absorb, and protect macros. while it may intitally delay the uptake of supplied macros, it will ultimately release it to the root system upon contact (and demand from the plant). this prevents losses to atmospheric and weather conditions (leaching, runoff, rain). in terms of the RGS product in particular, the name relates to "N-Ext RGS" - nitrogen extender root growth supplement, or something along those lines. I call it "really good shit." I have a video that shows 2 yards side by side, one i applied RGS, AMS, Aerated, and Seeded. The one next door, same application but no RGS. There is a distinct color difference 4 weeks after application. but don't take my word for it - do your own experiments.
so the whole goal is to supply your nutrients (NPK), use the humic acid as a "bridge" to increase nutrient availability efficiency to the plant, and utilize the kelp to increase cytokinin to promote shoot growth and keep the plant "healthy" in terms of its natural defenses.
in terms of the production process, cold extractions are better than heated extractions. heat will degrade the intergrity of the cytokinins in kelp. and to insure the most "biologically active" sample, the kelp must be "Brewed" over a long period of time. john perry at RGS built a 12 week brew system for his kelp.
His humic acid is produced in a brew fashion as well, well, actually, it's not exactly a brew - its more of a process.
if you were to take a sample of leonardite shale, we'll say 10 tons, and crush it up and soak it in water, you could extract some of the contained fulvic acids. fulvic acids are the smaller particulate component of humic and they're soluble at any pH. from there it would have to be tested for active percentage, and then reduced to meet "sell-able" AI (active inredient concentration). In ten tons, you may get 1 or 2 gallons of FA, and thats a shit load of wasted great material left behind. So to simplify the process, they first put the lignite in a super low pH solution. this precipitates out a more pure form of humic. they then prepare of solution of water and potassium hydroxide to bring the pH up to a 12 (humic is only soluble at a high pH). They then blend and mix the solution with the humic, and run it through a series of filters and screens, extracting as much of the humic and fulvic material as possible. at this point, it goes through a series of screens and the solution is brought back down in pH slightly to remain in solution and not react with other fertilizers as long as pH remains above a 4.5. if sulfite salts are used during the initial humic pull, before the high pH extraction, it will remain in solution without forming too many particulates when pH is brought back down.
hope that helps