Root growth would certainly come into play on perennial plots that are receiving more than moderate grazing/browsing pressure. Yes, roots are important for soil health, but as was discussed recently on a couple of different podcasts if you are looking to build quality soil then you just need to plant into native plants and not allow anything more than light grazing to stimulate constant growth. If your primary goal for food plotting or ag crop production is healthy soil then you are going about it all wrong. Certainly not saying that abusing what soil you have is a good thing. Just that the hype about "building better soil" by planting something in it has been way over done in recent years. One thing that drives me bonkers about Grant's comments on Growing Deer TV is that he building better soil in places that have "poor" or no soil. Soil takes 100s if not 1000s of years to make, ask any soil scientist. You don't create soil by just planting a certain cover crop on it one year.
It is far easier to improve existing soil than to build soil, maybe we are just splitting hairs in the above conversation in the use of terminology "building vs improving". When I say build soil (I guess I would actually be more accurate by saying "creating" soil), I am talking about taking parent rock base material and turning it into something that can sustain a wide range of plant and microbial life. "Rocks" in themselves are not soil, but over time make up a portion of the soil triangle - mineral particles, organic matter and pore space. Yes microbes and other living organisms contribute to the building of soil and make it easier for plants to take up "recycled" nutrients. I see improving soil such as taking your previously farmed fields from a red clay into a darker soil with a better structure and higher organic matter levels only as improving the soil from its previous condition. Sure Grant can argue that he is building soil, but not in any measurable way on a single year time line. Maybe the use of proper terminology is not of importance to his viewers, I just find it misleading to the consumer that thinks they are "building/ creating soil" in any truly measurable quantity if they plant a certain seed or blend. Not in any real sense of the word, and if their plotting or farming practices are causing erosion then they are likely losing more than they are "building". The most fertile and productive soils in the US had nothing but NWSG and forbs growing on them for the last several hundred or more years.Interesting post!
1. Sure native perennials are fantastic at building soils and sequestering carbon. This is through their vast root growth and massive amount of root exudation. Also, in native plantings, the benefit is extreme diversity which is further driving the microbial diversity in the soil, specifically fungi - over time due to the lack of disruption. Light to moderate grazing is amazingly beneficial, not only from a growth-stimulating effect but also from microbial diversity that is being added to the soil through animals' urine, feces, etc.
2. The long rate to build soil has been disproven. This was the traditional thought. However, it has been well documented by guys like Dale Strickland and others, to improve it FAR faster, through managed grazing and highly diverse mixes, etc. Much of the reason this was previously not understood, was our misunderstanding of the microbial biomass, and in general the functions of C: N ratios and how those impact our soil's active OM and stable OM over time. As these all increase, better water infiltration occurs, and the impact is exponential.
3. I will agree with you that it is been overpromised and underdelivered over the past several years. This is why I try my best to share as much detailed information as possible, whether someone uses Vitalize Seed or not - so that folks can understand the processes in the ways the soil functions. I love coming up with plans to best help the function of a farmer or food plotter vs. just promising some grandiose idea. This is somewhat the reason I made the above video, if the plots are being mowed to the ground - we have lost photosynthetic capture and root exudation - this is going to have a big impact on our ability to improve soil function - specifically from a microbial biomass perspective.
I think a larger focus should be on what we can visually see in the aggregate formation, CO2 burst n a test, and if we want we can do PLFA testing to further measure the biology that is impacting our soils both from a structure and nutrient cycling perspective. This is going to reduce input needs, increase carbon storage in the soil, increase root exudation, increase microbial diversity, and grow some darn good plots, gardens, AG fields, etc.
All of this should start with sound soil testing, PH adjustment, base saturation adjustment, and possible inoculations to help aid in creating the healthiest soils we can. I don't believe in going cold turkey on inputs, I think that is often misunderstood. We need biomass both in roots, and leaf production.
In 10 years, I have visually and statistically (on soil tests) watched my soils in the foothills of Appalachia turn from hard, compacted, dry, red-looking clay - to something much closer to dark chocolate cake, with amazing root/mycorrhizae visibly present.
Here is one example from a couple of years ago - this field was hard clay
Here is my garden - this was originally a fescue/rye grain lawn. Low area with compaction and almost no color. In a few years of cover cropping, keeping a living root going, and reducing inputs - it turned into the below.
I hope this helps and is at least interesting to you all if nothing else.
Although some might see that as splitting hairs - I think it’s a great point.It is far easier to improve existing soil than to build soil, maybe we are just splitting hairs in the above conversation in the use of terminology "building vs improving". When I say build soil (I guess I would actually be more accurate by saying "creating" soil), I am talking about taking parent rock base material and turning it into something that can sustain a wide range of plant and microbial life. "Rocks" in themselves are not soil, but over time make up a portion of the soil triangle - mineral particles, organic matter and pore space. Yes microbes and other living organisms contribute to the building of soil and make it easier for plants to take up "recycled" nutrients. I see improving soil such as taking your previously farmed fields from a red clay into a darker soil with a better structure and higher organic matter levels only as improving the soil from its previous condition. Sure Grant can argue that he is building soil, but not in any measurable way on a single year time line. Maybe the use of proper terminology is not of importance to his viewers, I just find it misleading to the consumer that thinks they are "building/ creating soil" in any truly measurable quantity if they plant a certain seed or blend. Not in any real sense of the word, and if their plotting or farming practices are causing erosion then they are likely losing more than they are "building". The most fertile and productive soils in the US had nothing but NWSG and forbs growing on them for the last several hundred or more years.
There are a lot of ag studies - specifically in cattle industry. Gabe brown, Ray a, Dale Strickland, Nicole masters, etc.Are there any studies or even personal stories about the change in organic matter in a field using these systems over time? I have some sandy soils that I would like to improve, so it would be nice to know what type of timeline is realistic for specific gains.
I have the best luck drawing deer in range with a sprayed soybean field, but I know that won't improve the soil. So I go with soybeans one year and a diverse green mixture the next year. I'm happy with the results, but I'm always looking for a better option.
"Who’s ready for planting season?!"
Not quite yet.