Mark Reed wrote:That is a nice turnip but it's way smaller than mine sometimes are. Mine generally volunteer and live through winter, I often leave them to rot the next summer after harvesting seed. One time I noticed a particularly large one. I just left it there and planted tomatoes around it. Sometime later on a very hot day I was bare footed while inspecting the tomatoes having forgotten about the giant turnip under the mulch. Suddenly my foot disappeared to above the ankle in something warm and slimy. Liquid turnip in the 90 degree sun! The aroma was in a word, memorable.
Yeah. That's only a comparison of the difference in my soil at present. You can't think of it like chemical fertilizer. It's more of a mineral inoculant. It still needs the organic matter and microbiology in the soil for optimum results. But lacking those things, it still makes a difference, and starts improving the soil in its own right.
He's basically formulated it to be idiot-proof. You can't really apply so much that you create problematic imbalances in your soil. It's meant to gradually bring the levels up over a handful of seasons such that you add less and less with each application until you don't need it anymore. I mean, he'd argue that you still need some amount each year, or at least every couple of years, to account for what you're taking out, but I'm still convinced that that's down to him refusing to adopt no-dig. I kinda figure his next book will be him admitting that he's been wrong this whole time and no-dig is superior, but he very well may die on that hill. π€£
It should also be noted that that turnip was harvested after we'd already gone 90 days without rain. To produce a turnip that size with no water and in otherwise atrocious soil is no small feat. This year we'll get to see how well they do with irrigation and increasingly improving soil. They'll be as big as basketballs in no time. π€£
Also important to recognize that the whole thing is multifaceted. I think Joseph has demonstrated that you can breed your way out of most problems. And it's ultimately the case that soils improve over time unless humans get involved and make them worse.
I think looking at Joseph's breeding work through the lens of Elaine Ingham and John Kempf's research elucidates
why Joseph's approach is so effective, sans amendments.
Elaine's work posits that every soil in the world has all the nutrients a plant needs to be healthy, they just aren't necessarily in plant available forms, so you need the soil biology to process those minerals so the plants can use them. Even her detractors have said that that's technically true, though they argue that there isn't necessarily
enough of each mineral to grow healthy plants, but those minerals are technically present in every soil. It's the soil biology that's missing.
That's our baseline. Minerals are there, plants just can't get to them yet.
There are two components of John's work that are relevant here. The first has to do with the relationship between photosynthetic efficiency and soil building. I mentioned it previously, but a monoculture of corn will increase soil organic matter by Β½% each year given that these two things are true: it's not a genetically modified corn (why that matters is key to understanding the second component of John's work) and that it has a photosynthetic efficiency of 60% or greater. Photosynthetic efficiency, at its most basic level, is a measure of whether a plant has the base minerals it needs to create carbohydrates through photosynthesis, or whether it must first expend some of the energy it produces to convert other components it has available into what it needs to complete photosynthesis. Manganese and a few other minerals are the limiting factors in photosynthetic efficiency. As efficiency increases, the plant ends up producing more carbohydrates than it can use to build biomass, so it ends up pumping out more and more of it as root exudates, AKA carbon, which boosts the soil organic matter literally just by having a plant that exists. (And the only reason corn is used is because it's been well-studied compared to other crops; this isn't something that's unique to corn.)
The fact that this doesn't hold true for genetically modified corn is telling. The reason it doesn't work with genetically modified corn is because it associates with a completely different set of microbes that ultimately oxidize minerals in the soil and create worsening soil, at least by certain measures. This means there's a very significant genetic component to what soil microbes any given plant will associate with. And since it's the microbes that cycle nutrients into plant available forms, then the plants which have the genetics for symbiosis with A) microbes that are endemic to the soil they're growing in, and B) the microbes that are most efficient at mining the necessary minerals in the soil, will have the best productivity.
The reason Joseph's plants do so well without any amendments, in my honest estimation, is because he's choosing the best plants each generation. The reason those plants are better is because they've been bred to have a more efficient relationship with the microbes that are native to his soil. What makes that relationship more efficient is that the microbes effectively convert minerals like manganese into plant available forms. Those minerals then increase the photosynthetic efficiency of the plants, which increases the amount of exudates they produce, which feeds a ever larger population of beneficial microbes, which then convert more manganese/etc. up to the point where the plant hits peak photosynthetic efficiency and thus peak soil building. All without external inputs.
This is why saving seeds is really the most important part of the process. Adding Steve's mix can jump start the process of improving photosynthetic efficiency, and importing organic matter can help keep the soil microbes fed in spite of less efficient photosynthesis, and you will see the benefit no matter what seeds you put in the ground if everything else is improving, but if those seeds are adapted to the specific microbiology of the local soil that's when the real magic happens.
Time is the other factor. Like I said, all soils are moving towards health in the absence of negative human intervention. All plants are moving toward health in the absence of human intervention as wellβthe best plants (maybe or maybe not by human standards) produce the most offspring and pass on the traits that made that possible, i.e. symbiosis with the ideal microbes. We can speed up the process, but it's happening with or without us, if maybe only over hundreds or thousands of years. If we do nothing, the soil biology improves eventually. If we add organic matter, soil biology can improve dramatically in over 3-5 years. But if we create and analyze compost tea under a microscope to ensure that it has the correct ratios of bacteria to fungi to protozoa to nematodes, we can get massive gains in a single season. So, it's just a question of how long we're willing to wait, and what effort and resources we're willing and able to put in. I would prefer to not import anything, and I know that it's not necessary, but I'd also like to eat. Long-term, my emphasis is on breeding and soil improvement. Short-term, spending $50 to jump start the whole process and get a worthwhile yield in a limited space is worth it. It's less than I'd spend on a similar quantity of groceries, and the quality is vastly superior. But I'm certainly not putting all of my eggs in one basket. Like you, making seeds prove themselves in some back field without any pampering is what makes them worthy to be saved. Because those are the plants that are keyed into this natural system for soil improvement.
This is a lot of what I've been mulling over lately: the relationship between improving plants and improving soil. Gleaning those tidbits from John's talk really helped make sense out of why traditional breeders never have to amend their soils, and yet those get better or stay the same year after year of growing the same crop. Meanwhile, farmers/gardeners routinely amend their soils, be that with fertilizers or compost. The only difference I can see is that breeders are selecting the plants that most benefit the soil, whereas the farmers and gardeners that have to amend their soils are importing new genetics each year that extract from the soil without giving anything back.
But that's just my writing theory so far. I guess we'll see how my unpampered landraces improve from year to year and what happens to the soil in the process.