Great thread, and thanks for the heads-up, Rodney.
I would only add a couple of thoughts, as this topic applies to my gardens. The native soil in both my gardens has a lot of red or brown clay, along with varying amounts of alluvial sand. The country garden also has irony siltstone nodules, stream gravel, oilfield "artifacts," and Bermuda grass runners. The first year I had no choice but to till down to 6 inches or so, to break up the clay and iron cement and to remove the grass runners. This also allowed me to mix in plenty of hardwood chips, the benefits of which I've mentioned on these boards several times. (See links below). Also, if one is planting in "mounded" rows, it's necessary to till the first year just to build up the rows. (Essential for good drainage when you have a shallow hardpan substrate.)
In my suburban garden, where the surrounding lawn is primarily easily-managed St. Augustine grass, I have been able to maintain tall "no-till" mounded rows. After plant-out every year I add 3-4 inches of chipped hardwood, which continues to build the soil but also adds an absorbent "water blanket." Below is a photo of my suburban garden about one month after plant-out, in early June. The variety is Aji Umba:
And more recently. The Aji Umba row is in back, obscured by Bonda ma Jacques, and the container row of Yellow 7:
The large garden in the country is surrounded by highly invasive Bermuda grass. So far I have not found a way to completely eliminate it, so I have been forced to re-till every year. Aside from the extra work, I don't really mind, because it gives me a chance to add more hardwood chips, and I still get very large, productive plants. I have tried using weed cloth, and was not satisfied with the results, but that was very early in my gardening career, so probably I was doing something else wrong. In 2013 I will try cloth again. At any rate, this is what the country garden looked like yesterday. The plants in the back right, Thai Birdseed, are seven feet tall (the reason for the stepladder):
My goal is to keep both gardens no-till. I believe I will get there next year.
Here's a link to the original Canadian work on rebuilding exhausted soil with hardwood chips, including Prof. Lemieux's thoughts on the advantages of not tilling:
https://dl.dropbox.c...mieux_Paper.pdf
And another, more practical, paper:
https://dl.dropbox.c..._2007_11_27.pdf
I would only add a couple of thoughts, as this topic applies to my gardens. The native soil in both my gardens has a lot of red or brown clay, along with varying amounts of alluvial sand. The country garden also has irony siltstone nodules, stream gravel, oilfield "artifacts," and Bermuda grass runners. The first year I had no choice but to till down to 6 inches or so, to break up the clay and iron cement and to remove the grass runners. This also allowed me to mix in plenty of hardwood chips, the benefits of which I've mentioned on these boards several times. (See links below). Also, if one is planting in "mounded" rows, it's necessary to till the first year just to build up the rows. (Essential for good drainage when you have a shallow hardpan substrate.)
In my suburban garden, where the surrounding lawn is primarily easily-managed St. Augustine grass, I have been able to maintain tall "no-till" mounded rows. After plant-out every year I add 3-4 inches of chipped hardwood, which continues to build the soil but also adds an absorbent "water blanket." Below is a photo of my suburban garden about one month after plant-out, in early June. The variety is Aji Umba:
And more recently. The Aji Umba row is in back, obscured by Bonda ma Jacques, and the container row of Yellow 7:
The large garden in the country is surrounded by highly invasive Bermuda grass. So far I have not found a way to completely eliminate it, so I have been forced to re-till every year. Aside from the extra work, I don't really mind, because it gives me a chance to add more hardwood chips, and I still get very large, productive plants. I have tried using weed cloth, and was not satisfied with the results, but that was very early in my gardening career, so probably I was doing something else wrong. In 2013 I will try cloth again. At any rate, this is what the country garden looked like yesterday. The plants in the back right, Thai Birdseed, are seven feet tall (the reason for the stepladder):
My goal is to keep both gardens no-till. I believe I will get there next year.
Here's a link to the original Canadian work on rebuilding exhausted soil with hardwood chips, including Prof. Lemieux's thoughts on the advantages of not tilling:
https://dl.dropbox.c...mieux_Paper.pdf
And another, more practical, paper:
https://dl.dropbox.c..._2007_11_27.pdf