FRESH

Hacker News

Home

Earthquake scientists reveal how overplowing weakens soil at experimental farm

211 points by Brajeshwar

by WaitWaitWha

4 subcomments

Just to be clear, plowing and tilling are not the same thing, and this article implies the researchers might be using it interchangeably. They bundle different soil-disturbance practices together, irrelevant of their uses, and potential compaction impact. Of course, tilling can also just be used as a generic term for all of the soil management in farms, but this is never explained.
It is also unclear if the paper is removing traffic compaction or it is part of their results. when an MF 8700 with 23,800 pounds rolls around it will compact things. A lot. I have a lunch box to prove it.
Would love to see no-till vs shallow till vs deep plowing. For this paper, they should have introduce and have primary conclusion around the technical data gathering as a novel idea, not draw conclusion from the collected data.
The physics and sensing seems rigorous. Understanding of agricultural taxonomy, farming, is coarse at best. 40 hours of total data during rain is a wee bit short. 2cm depth for the fiber is only going to sense near- or surface. Most crops go deeper than that. Single-site experiment on a single type of soil is very narrow.
To me, plowing (like a chisel plow or moldboard) is to break up soil, and 'folds' old crop like corn stalks back in. It is also the first step for never-used land prep for growing stuff. Usually, beginning of season, compacting, or new site. 8 to 20 inches deep. can flip the soil upside down.
Tilling gets the soil ready for seed, aeration, crumble large lumps and fill larger gaps on the surface, or mix fertilizer/compost into soil. 4 to 12 inches deep.
Discing aka harrowing (disc harrow) usually will cut the remaining roots a few inches deep, often done post plowing. good for putting last years leftovers just a few inches under. 4 to 6 inches.
Note that it seems that as the field size gets smaller, the tilling vs harrowing seems to flip? At least how people consider using them.
(edit: I am all over with this one, but I think the gist comes through.)

by heathrow83829

5 subcomments

to till or not to till, that's the question. one way to look at is check the yields that result from dig vs no dig. Charles dowding did exactly that. for seven years he had two plots, one where he dug and one where he didn't. in each one he added the same amount of compost and grew teh same crops on both sides.
Overall, the nodig plot harvest 10% more. but here's where it gets interesting. those yields were not uniformly spread across the vegetable types. if you dig into the data, you'll see, some did quite worse with dig and some did quite better. guess which ones did better on dig? Potatoes, Rutabagas, carrots and parsnips and cabbage all did better in Dig! roughly to the tune of about Potatoes 21%, carrots 21%, Rutabaga 14%, Cabbage, 11%, broad beans 10% better. it's all published in his books. Everything else did better with no dig. Shallots especially did 33% better with no-dig, ales 21% better, onions 22% better with no dig.

by prewett

4 subcomments

I think the article's theory on why people plow is wrong: it is not to let the soil hold more water, but to get rid of weeds. I know someone who did no-till for a while, and he found that you have to spray with glyphosate to keep the weeds down. Eventually the weeds that had evolved to be glyphosate-resistent spread to his area, and he had to go back to regular plowing. He said that the no-till really improved the soil, though.

by altairprime

2 subcomments

Given the discovered ability of fiberoptics to sense water content, a kind of fiber fabric could be deployed to sense water levels across an entire field at the cubic yard level. The sensing controller would end up resembling an LCD addressing controller in reverse, with row/column/subpixel (sub-terranean-pixels!) breakout. Not that pixel-addressed farm fields are going to be efficient to work yet, lacking both processes and tooling for soil, seed, and harvest — but with sensing- and tool-assisted farming, we ought to be more able to harness the soul that we have without destroying it with the sledgehammer-nail “till the whole field” approach.

by regus

2 subcomments

Overplowing is what created the dust storms of the Great Depression Dust Bowl era.

by CrzyLngPwd

0 subcomment

That heavy clay soil in the main photo looks awful.
I have around 45 acres of heavy clay, poor agricultural land, which would look very similar to that if we allowed heavy machinery, or even an ATV, on it when it is sodden.

by ggm

0 subcomment

Angus Calder "the people's war" about the british home front in WW2 notes older farmworkers in the south downs virtually crying as land which had been unploughed since the norman conquest was put to the plough because of grain shortages from the U boat war.
Maybe they knew a thing or two (low earthquake zone, it has to be said)

by destitude

0 subcomment

Let alone the wind erosion from having exposed soil over winter.

by PunchyHamster

0 subcomment

...isn't loosening the soil the entire point of plowing ? Like, congratulations, you have discovered what farmers already knew.
Also, just plowing is pointless, the point is to grew plants better, ignoring that and just looking at moisure at some level is pointless

by nodesocket

1 subcomments

I admit farming knowledge is not my strong suit, but I thoroughly enjoyed the Amazon series Clarkson’s Farm. If you want to see a country destroy its agriculture industry, look no further than the UK. Their shortsightedness, bureaucracy, and blind acceptance of doomer environmentalists essentially bankrupted farmers in the country side.

by worthless-trash

1 subcomments

Zero / minimal tillage has been a thing for decades, im surprised this is news.

by monkaiju

4 subcomments

I realize this exact data might be novel, but haven't we know that till-reliant farming was detrimental to soil for a long time? The no-till people are a huge part of the permaculture movement, also theres always folks talking about how important fungal networks are and how they're largely destroyed by tilling.
I mean even Karl Marx talked a ton about soil health and while he mostly talked about "metabolic rift" not tilling (that I know about) specifically it seems like a similar focus on short term output vs long term soil health.
I guess I'm just not clear on if there is actually a new serious problem being "revealed" as the title says or just being substantiated further.

by aaron695

0 subcomment

[dead]

by trusted_brother

1 subcomments

Yes this is entirely true and we must ban farming immediately.