Posted by & filed under Land, Plant Systems, Podcasts, Seeds, Soil Conservation, Soil Rehabilitation, Structure, Water Conservation, Water Harvesting.

With the U.S. and other countries caught in unprecedented droughts, and arid areas of the world growing in tandem, this simple method for speeding revegetation at scale offers a lot of promise.


Imprinting roller


Imprinted soil

The barren, arid landscapes of the world are notoriously hard to revegetate. Indeed, the earth in these regions is usually very hard to describe as ‘soil’. As vegetation dies off, the soil gets exposed to intense heat and evaporation, and any seeds that are present, or applied, are then unable to get the moisture they need to germinate and survive. With plant roots, organic matter and microorganisms no longer present in the soil, it rapidly loses any of the structure it once possessed. Soil erosion from rain events and harsh winds then easily undermine nature’s attempts at natural, progressive restoration, by sending any accumulated soil particles elsewhere, or out into the ocean.

Human intervention has been, in many cases, the driving force in starting this destructive cycle, and, as evidenced by the rapid advancement of desertification worldwide, it’s also clear that it will only be through human intervention that we can reverse it.


Before imprinting


During


1 year after

Dr. Robert Dixon has been experimenting and having great success with a simple way to fast-track the revegetation of barren lands since 1976 — with a technique called ‘imprinting’. Found in a forgotten Internet 1.0 styled corner of the interweb, and forwarded to me by Geoff Lawton, this method immediately struck a chord with my biologically minded self, as I’m sure it will for all of you soil afficionados.

Imprinting is a method for instantly adding what permaculturists call the ‘edge effect’ to soils, utilising a heavy and dimpled/wedged roller to ‘imprint’ soils with patterned depressions. The bottom of these depressions then become collection points for all the crucial elements needed for seed germination and soil building: seeds themselves, water, organic matter (including plant debris and animal manure) and wind-blown silt and clay particles.


Before


During


Four months after

Instead of rain running off the land, taking precious organic matter and soil particles along with it, an imprinted surface soaks and sinks the water instead. The lucky seed that finds itself at the bottom of one of these dimples also gets shaded from the harsh sun during the early morning and late afternoon parts of the day.

Bill Mollison actually featured the imprinting technique in the Global Gardener video series. Watch from 23:45 of the Drylands episode of the series to see Bill and Bob taking a look at the machine, how it works, and the amazing results. It’s stunning to watch as the cameraman films the two men walking through a degraded section of land — which had little to no hope of revegetating naturally — before turning 180 degrees as they enter another section of the same land, but which had had the imprinting applied. The scene goes from a bare sandy soil with a few scattered bushes to one of quite dense grassland. This metamorphosis begins a new and positive cycle, where the soil is now protected by plants — from sun, wind and rain and flood events — and so moisture and organic matter can once again begin to accumulate on and in the soil. In this scene you can clearly see that a natural cycle of succession has been kick started into life!

The no-till method for seeding of plants called land imprinting has been under development in Tucson, Arizona since 1976. Through ecological weed control, land imprinting has restored perennial grasses to 20,000 hectares of degraded rangeland in southern Arizona since 1980. — imprinting.org

Most of the arid regions of the world get a reasonable dump of rainfall at least once or twice per year. Can you imagine the potential found in imprinting large areas of arid land just before the Spring rains? I can envision these areas being simultaneously imprinted and seeded — and seeded with a diverse mix of hardy, climate-appropriate pioneer grasses, legumes and other plants, which can themselves be just the beginning of nature’s own series of subsequent successions.


Well-formed imprints in the foreground efficiently establish vegetation on severely
degraded land. The ripping shanks at the rear of the tractor loosen hard soil
spots enough to imprint them.

These transformations, once begun in the uninhabited and uninhabitable areas of our world, can then be left to themselves, to progress on their own. Regeneration can thus still occur at scale in the interim, even while we’re yet figuring out how to transition the intensely farmed, more inhabited parts of our landscapes into a similar, more regenerative cycle.

Indeed, I can also envision a version of the imprinting roller designed to be pulled by beasts of burden, or even by a few people, in order to better establish gardens and perennial grasslands for humans, livestock and wildlife in inhabited rural areas.

Dr. Dixon has experimented and fine-tuned various imprinting roller types, and for different situations (i.e. flat lands, slopes, etc.). He has, in point of fact, made quite a science out of it. Readers wanting to find out more should thoroughly check out www.imprinting.org, and the following article in particular:

As permaculturists well know, nature always seeks to restore herself, and often will, if left in peace, to her own devices. But we also know that once certain feedback loops have kicked into gear, like desertification, even nature itself is unable to restore itself. In these cases, humans armed with determination and an holistic understanding of the integrated sciences of biology, soil science and hydrology, etc., can give nature a helping hand, and speed her on her way.

If we can do this, then, as John Liu astutely put it, why don’t we?

Imprinting soils may offer an easy, efficient and cost-effective way to stabilise desert soils and create new rangelands (and ultimately perhaps even carefully managed croplands), by putting arid lands and degraded ‘set asides’ back to work — pulling untold tons of CO2 out of the atmosphere, where it currently works to grow deserts, and putting it back into our soils where it builds fertility and climate stability instead.

For good measure, and to hear the man himself, take a listen to this podcast interview with Dr. Robert Dixon, courtesy of agroinnovations.com:

Click play to hear the interview!

Interview with Robert Dixon

11 Responses to “Imprinting Soils – Creating Instant Edge for Large Scale Revegetation of Barren Lands”

  1. Geoff

    I remember seeing this technique in Bills videos. wasn’t it also used to help remediate the dust bowl

    Reply
  2. Nancy

    It is so encouraging to see how quickly positive change can happen. It is so hopeful when such a simple solution is found to such a major problem. I love the daily permaculture emails for sharing this and other positive news.

    Reply
  3. Dean

    I am suddenly thirsty for knowledge about land imprinters. Are they to be found in Oz? Are there examples of people dropping in seed of their own choice?

    Reply
  4. Craig Mackintosh PRI Editor

    Hi Dean. Other readers may be able to correct me, but I personally only know of Mr. Dixon’s work in the US with these imprinting rollers. I hope this article may inspire some others to have a go at this.

    Reply
  5. Chris McLeod

    Hi Craig,

    I’ve never seen these machines at work here in Australia either. Interestingly enough, what the machine is doing is exactly what Yacouba was doing in the article:

    http://permaculturenews.org/2012/08/13/the-man-who-stopped-the-desert-what-yacouba-did-next/

    The only difference was that Yacouba was doing the same task with picks and mattocks and a lot of manual labour.

    I had to laugh, because this was the exact same process I started here a few years back when I began planting fruit trees and breaking up the almost concrete like hardened clay. Honestly, back then 30 good holes for fruit trees would take me an entire day and I felt it. It was back breaking labour. Now the ground is so full of air, water and life it is spongy!

    Without this work, rainfall would simply roll off the top of the dead clay-pan.

    Regards

    Chris

    Reply
  6. Khadijah

    This is so encouraging. So much for people who say that Permaculture won’t work on a large scale! Truly, a hope for those of us who love the idea of “Greening the Desert.”

    Reply
  7. Dean

    I wonder if we here in Oz could go to a local engineering company, one that produces farm equipment and get them to put together a land imprinter? I also wonder if an imprinter could be made that could be hand pushed? Similar to a hand pushed roller of the type that is used to roll cricket pitches. Could be useful in an urban situation.

    Reply
  8. JeniLey

    Wow, never heard of imprinting before and am very impressed. The possibility to convert deserts into croplands would be a mighty achievement.

    Reply
  9. greg espey

    On can also use on sandy soils a sheepsfoot roller which is actually for compaction, but will dimmple the earth on sandy soils.

    Reply

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