does no till farming use herbicides

The industrial version of no-till works like this: plant a GMO crop, spray glyphosate to kill competing weeds, harvest, repeat. No tillage equipment needed. Labor costs go down, fuel costs go down, and the soil does get some benefits from not being physically disrupted, organic matter accumulates at the surface, erosion decreases, and some biology returns. These are real improvements over conventional tillage.

But you're still applying herbicide. And herbicides, including glyphosate, have effects on soil biology that go beyond killing weeds.

Research published in Frontiers in Environmental Science documented that glyphosate indirectly affects plant, animal, and human health through its effects on microbial communities. The effects on specific microbial processes in soil are real, even if the broad-spectrum disruption isn't as dramatic as a fungicide applied directly to soil. When soils that haven't been previously exposed to glyphosate receive their first applications, the bacterial network structures change significantly. Over time, as soils are repeatedly exposed, the community adapts, but the community that adapts is not the same community that was there before.

Biological no-till, which is what I practice in my backyard and what we're working toward at the Needville project, uses different approaches to weed management. Mulch. Cover crops. Tarps for occultation. Dense planting. The goal is to suppress weeds without chemicals by depriving them of light and space, rather than poisoning them.

This approach protects the full soil biology: bacteria, fungi, protozoa, nematodes, arthropods, earthworms. The entire food web that makes the soil productive stays intact.

Let me explain why no-till matters at all from a biological standpoint, because I think this is underappreciated.

When you till, when you invert the soil, break it up, aerate it, you physically shred fungal networks. Mycorrhizal fungi extend fine threads called hyphae through the soil over distances of feet and sometimes yards. Those networks take months or years to establish. A single tillage pass destroys them in minutes.

You also bring anaerobic organisms from deep in the soil up to the surface where there's too much oxygen for them. You bring aerobic organisms from the surface down into low-oxygen zones where they can't function. You disrupt the layered ecology of the soil, which has different communities performing different functions at different depths.

And critically, you spike and then crash microbial activity. The disturbance and oxygen influx cause a burst of microbial respiration that burns through the organic matter in the soil. Organic carbon goes up in CO2. The biology spikes, then crashes. The soil is left with less structure, less biology, and less organic matter than it started with.

You basically invert everything so the decay cycle can't catch up. If you continue to till repeatedly, which is what conventional agriculture does, the biology suffers so tremendously that it can barely function. The soil loses its capacity to suppress weeds, regulate water, or cycle nutrients through biological pathways.

Long-term no-tillage, by contrast, has been shown in USDA research to produce higher soil carbon and nitrogen content, more viable microbial biomass, and greater enzyme activity at the surface compared to conventional tillage. A meta-analysis of 43 studies found that no-tillage significantly increases soil bacterial diversity, with structural equation modeling confirming that stubble retention under no-till improves bacterial diversity primarily by maintaining soil organic carbon and nitrogen (Li et al., Soil and Tillage Research, 2020). The biology accumulates when you leave it alone.

I use tarps. Black silage tarps laid over the beds exclude light, heat the soil surface slightly, and kill off existing weed growth through a process called occultation. The weeds die. Their residue breaks down. The worm population actually increases under tarps because the worms come up to feed on the decaying material.

When I take the tarps off, the bed is covered with decomposed organic matter, the weed seed bank is depleted in the top inch of soil, and the soil is ready to plant into with minimal disturbance. I use a broadfork if I need to break up any compaction, a broadfork doesn't invert the soil layers, it just creates air channels straight down. Then I plant.

No herbicide. No tillage. And the biology is intact.

The tarps are doing the weed management job that glyphosate does in chemical no-till. But they're doing it without any of the collateral effects on the microbial community.

Here's the genuinely complicated part of this conversation that I want to be honest about.

Glyphosate-based no-till has, in some documented cases, increased soil organic carbon compared to conventional tillage. The Genetic Literacy Project has cited research showing that GMO-enabled no-till farming preserves soil carbon that tillage would otherwise burn off. And that's true. Chemical no-till is genuinely better than conventional tillage for carbon storage.

But better than tilling is not the same as good. The question for regenerative agriculture isn't "is chemical no-till better than conventional tillage", it's "what does soil biology look like in a system that's been under repeated herbicide application for twenty years compared to a system built on biological weed management?"

The research on glyphosate's effects on soil microbial communities is still accumulating, but studies published in PMC have documented effects on specific microbial groups and processes even when broad-spectrum community diversity appears similar. The full picture isn't in yet. What we know is that biological no-till, tarps, cover crops, dense planting, mulch, preserves the complete soil biology in a way that chemical no-till does not.

Not all soil disturbance is the same. There's a spectrum from completely hands-off biological no-till to deep moldboard plowing, and different types of disturbance have very different effects on the biology.

A broadfork that opens channels without inverting layers causes far less biological disruption than a rototiller that pulverizes everything. A shallow cultivation pass to terminate a cover crop is less damaging than deep primary tillage. Spot treatment of individual persistent weeds by hand causes less disruption than broadcast herbicide application.

When I say no-till, I mean minimizing disturbance to the soil structure and biology as much as possible, using the least invasive method available for each job. That might mean I occasionally use a hoe or a stirrup cultivator. It doesn't mean I'm spraying herbicides.

The goal is always to protect the decay cycle, keep the biology running, keep the organic matter cycling, keep the fungal networks intact. Every management decision should be evaluated against that goal.

Does no-till farming use herbicides? In a lot of cases, yes. But no-till done right, biological no-till, doesn't need to.