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Small Farmer's Journal
PO Box 1627
Sisters, Oregon 97759
800-876-2893
541-549-2064
agrarian@smallfarmersjournal.com
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Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

Cultivating Questions Concerning the Bioextensive Market Garden

by Anne and Eric Nordell of Trout Run, PA

Tailoring The Cover Crop-Tillage Combination To The Planting Window

Finding just the right cover crop-tillage combination for crops planted the last half of June has always been a real challenge in our location. While surface-tilling mature rye and vetch in May works well for fall crops established in July and August, this cover crop-tillage combo does not allow enough time for decomposition and moisture accumulation for end-of-June plantings. Working the rye and vetch a month earlier would provide a more desirable time frame between tilling and planting, but killing this overwintering cover at an immature stage like this often seems futile using a light-weight, two-horse disc. The knee-high live rye bounces back to life after each discing.

Discing a winterkilled cover of oats and Canadian field peas has proven much easier which is why we routinely use this cover crop mix for early spring crops planted in April and May. However, this winterkilled mix decomposes so quickly that by the beginning of June the oat-and-pea residues no longer provide much moisture conserving mulch.

The last two years we have experimented with winterkilled covers that produce a lot more biomass, such as the sorghum-sudangrass mentioned earlier, in the hopes that the resulting mulch of coarse, rot-resistant materials would create better conditions for planting cash crops around the summer solstice without irrigation. An alternative strategy for preparing a moist fertile seedbed for the late June planting window has been to try to figure out a more effective way to shallowly incorporate the overwintering immature rye the end of April.

An answer appeared in the form of Dan Fisher. He paid us a visit five years ago because he was intrigued with our adaptation of ridge-tillage to early season vegetable production. Part of his interest stemmed from the fact that he had helped to develop a ridge-till system for large-scale field crops during his tenure as a biological crop consultant in the Midwest. By contrast to our use of ridge-till as a planting system relying on winterkilled cover crops (see the Spring 2002 SFJ), Dan’s objective for ridge-tilling was the efficient incorporation and decomposition of a live cover crop, like rye, before a heavy feeding crop of corn.

As we understand it, preparation for Dan’s ingenious ridge-tillage method begins right after the previous fall harvest. The idea is to broadcast rye seed over the chopped corn stalks and then rip the ground deeply using a chisel plow equipped with large twisted shovels. The chiseling breaks up compaction caused during combining and incorporates the rye seed at the same time. The reason for using twisted shovels on the chisel plow is they aggressively churn up the earth, throwing the soil and crop residues into low ridges to encourage aerobic decomposition.

Growing the rye on the rough, chiseled ridges provides two important advantages the next spring in terms of sheet composting this overwintering cover crop. First, the ridged soil is noticeably warmer, drier and better aerated than flat ground, creating better conditions for both tillage and decomposition. Just as importantly, the ridged soil surface makes discing more effective by giving the disc blades more purchase than working a smooth field of rye. Dan claimed that knee-high rye would be ready for planting within 2-3 weeks after the first discing!

After Dan’s visit it occurred to us that ridged rye might also make our two-horse disc more efficient at knocking back an immature live cover. Instead of using a hard pulling chisel plow with twisted shovels, we relied on the modified two-row cultivator we call the “ridger” to incorporate the rye seed and form the low ridges.

Based on three year’s experimentation with this technique, we can say that ridged rye definitely makes our lightweight horsedrawn equipment more effective even if several discings are necessary to completely set back the knee-high rye. Our guess is that growing overwintering cover crops on low ridges would also prove to be a mechanical advantage for the tools pulled by a small Farmall tractor like the Super A.

In the following photos we try to detail the steps involved in establishing ridged rye on our farm for the 2002 growing season. We also compare this method for incorporating an overwintering cover crop in April with a winterkilled cover of waist-high sudex, planted in the same field, just to see which of these cover crop-tillage combinations is best suited for that challenging planting window the last half of June.

Ridged Rye Versus Sudex Before Midsummer Lettuce, Beans And Zucchini

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

1b. Field 3, in the Summer of 2001, was made to order for setting up a comparison between two different cover crop-tillage combinations. Rye on the north and south sides of this fallow field had been incorporated early enough to establish a mix of sudex and Donegal forage soybeans the beginning of August. These heat-loving annuals had already produced a good bit of cover a month later at the time this photo was taken.

In the middle of Field 3 had been our strawberry patch, established the previous spring along with other EARLY planted crops, and surface-tilled right after the last ripe berry was harvested, mid-July of 2001. After shallowly incorporating this heavily mulched perennial crop with the coultervator, disc, ridger and springtooth harrow, this area was now ready for seeding ridged rye.

We have found the best way to establish ridged rye is to incorporate the seed before forming the ridges. We do this the same way we would normally plant a cover crop on a flat field, first broad- casting the rye with a hand cranked cyclone seeder, and then working in the seed with one pass of the springtooth harrow as shown in this photo. Immediately after harrowing in the seed, we…

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

2b. …rolled the harrowed ground with the cultipacker to re-level and settle the soil. Firming the lightly tilled earth with this type of roller greatly improves germination of the broadcast seed by insuring good seed-to-soil contact and by bringing moisture back up to the surface via capillary action. Based on twenty years of dryland market gardening, we think the cultipacker in combination with lots of surface-tilled residues, is probably the most important tool for establishing crops without irrigation.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

3b. We followed the cultipacker with the “ridger.” The three-inch-wide shovels attached to the spring shanks mound the soil and residues into low ridges somewhat approximating the effect of a fast-moving chisel plow with large twisted shovels. No doubt a similar setup could be designed for the Super A by rigging up some kind of toolbar to the back of this small cultivating tractor. We are not sure about the mechanics involved, but we are pretty certain that the horsepower requirements would not be the limiting factor. We say this with confidence because ridging loose soil is one of the earliest jobs for our two-horse team.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

4b. Rye greening up on the ridges a couple of weeks later. A visitor checking out the ridged rye suggested that we might have gone about this all backwards! Instead of going to the trouble of creating a serrated field to make our horsedrawn disc more effective at incorporating the rye, why not put serrated blades on the disc? F.Y.I., the 4-5” high ridges spaced 17” apart give our small disc much more purchase than 2” notched blades!

NOTE: If we had not incorporated the cover crops seed before forming the ridges, the ridger would have concentrated most of the rye on the peaks of the ridges, leaving the valleys relatively unprotected.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

5b. Another three weeks and the ridges have almost filled in with the overwintering rye. Meanwhile, the sorghum-sudangrass on the north and south sides of Field 3 had grown waist-high with the forage soybeans not far behind. In two months’ time, this heat loving, drought hardy cover crop combo had already produced a lot more coarse biomass than our usual winterkilled mix of oats and field peas.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

6b. The sudex mix also died back a lot sooner than our usual oat-pea combination, turning brown with the first hard frost in October. To our surprise, increasing the amount of high lignin biomass with the sudex and soybeans did not prolong the moisture conserving mulch the next spring as we had anticipated. To the contrary, the brittle corn-like stalks allowed a lot more sun and wind to reach the soil than the mat of winterkilled oats and peas. Instead of planting late June crops in the sudex stubble, we ended up using the north and south sides of Field 3 for the early May planting window. That explains why the 2002 Crop Map designates Field 3 as both an EARLY and LATE field, and why we think the sudex-soybean mix might be worth trying in areas with milder winters and wet springs.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

7b. Unfortunately, we did not take any photos of discing the ridged rye in Field 3 during the Spring of 2002. But just to give you an idea of the effectiveness of this low-tech, minimum-tillage method, here are a few photos of discing ridged rye in the Contour Strip during the dry spring of 2001. This shot documents the first time over the field when the disc slices and dices the ridges. Very little of the rye is incorporated with the first pass, as documented here, yet the disc blades are cutting much more deeply into the ridgetops than possible on a flat field of immature rye.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

8b. Making a second pass in the opposite direction moves the sliced-and-diced rye on the ridgetops into the valleys. A little bit of elevation not only improves the undercutting ability of the disc blades, but makes it possible for this slow moving, horsedrawn implement to bury more of the knee-high topgrowth with soil. This is why we think that serrating the field gives our lightweight disc more of an advantage over the live rye than using serrated blades.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

9b. A couple of weeks later we disced the Contour Strip again to kill the remaining rye and more completely incorporate the cover crop residues. We had the opportunity to test out a new disc from the Groffdale Machine Shop for this purpose, thinking this well-engineered implement would make the ultimate minimum-tillage tool for the team. It definitely cut into the soil and residues much better than our modified old disc, but we soon realized it required more weight (such as the bags of rock phosphate temporarily strapped on here) and a hydraulic lift system to really do the job of a primary tillage tool. Otherwise, we were so impressed with the Groffdale disc that we devoted some space at the end of this photo essay to point out the ingenious details of this well-conceived implement.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

10b. Back to Field 3 where you can see the midsummer crops of beans and zucchini thriving after ridged rye in 2002. Due to the wet conditions in May and early June, it did take a little more effort to kill the vigorous rye on the ridges than in the dry Spring of 2001. Nevertheless, the technique worked well enough to get the land ready for late June and early July plantings, holding the moisture until we were saved by some end-of-July rains.

The Cornell researcher collecting data on a handful of our crops for NEON, was impressed that the midsummer lettuce already harvested on either side of the zucchini (and interseeded with the single row of buckwheat now blooming in the pathways) produced respectable heads despite receiving only .4” of rain. He also noted that our lettuce samples weighed the same as the other farms in the study which were irrigating as much as possible during this hot, dry period. More surprising to us was that his extrapolations indicated that our single-row lettuce (on a 32” row spacing) yielded as much on a per acre basis as the growers planting their lettuce in multiple-row beds.

As for Jeff Canaan’s questions about selecting a winterkilled cover crop suitable for mild winters and a small cultivating tractor, we wonder if hybridizing the cover crop-tillage combinations trialed in Field 3 might be the answer. At least, when we experimented with planting sudex and soybeans on ridges in the Experimental Patch in preparation for a 2002 interplanting of tomatoes and onions, we were impressed with how early we could begin spring tillage. The soil in the raised ridges covered with coarse corn-like stalks dried out sooner than anywhere else in the market garden. More importantly, our two horsepower disc had absolutely no problem incorporating the ridged winterkilled cover crop in time for the early May onion planting window.

Spotlight On: Crops & Soil

Making Sorghum Molasses

Making Sorghum Molasses

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Growing sorghum doesn’t take much work, according to Buhrman. You plant it in the spring, work it a couple of times and that’s about all that’s required until late in the growing season. That is when the work begins. Before it is cut, all the stalks have to be “bladed” – the leaves removed from the stalks. It’s then cut, then the tassles are cut off, and the stalks are fed through a crusher. The crusher forces the juices out of the plant. The sorghum juice is then boiled in a vat for four to five hours until nothing is left but the syrup.

Mullein Indigenous Friend to All

Mullein: Indigenous Friend to All

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Mullein is a hardy native, soft and sturdy requiring no extra effort to thrive on your part. Whether you care to make your own medicines or not, consider mullein’s value to bees, bumblebees, butterflies, moths, dragonflies, who are needing nectar and nourishment that is toxin free and safe to consume. In this case, all you have to do is… nothing. What could be simpler?

Seed Quality from Two Perspectives

Seed Quality from Two Perspectives

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We are approaching this from a seed quality standpoint, not just a seed saving one. Saving seed is fairly simple to do, but the results from planting those seeds can be very mixed; without a basis of understanding of seed quality, people can be disappointed and confused as to why they got the results they did. Both the home gardener and the seed company must understand seed quality to be successful in their respective endeavors.

Cultivating Questions Ridge-Till Revisited

Cultivating Questions: Ridge-Till Revisited

Delay ridge building until early fall so that the cover crop on the ridge does not grow more than 12” tall before winter. The residues from a short cover crop will be much less challenging to cultivate than a tall stand of oats, especially if tangly field peas are mixed in. Waiting for the winterkilled cover crop residues to breakdown as long as possible before ridge-tilling in the spring will also make cultivation much easier until you gain familiarity with the system.

Cultivating Questions

Cultivating Questions: Follow-Up On Phosphorus

We like to think that the bio-extensive approach to market gardening minimizes the risk of overloading the soil with nutrients because the fallow lands make it possible to grow lots of cover crops to maintain soil structure and organic matter rather than relying on large quantities of manure and compost. However, we are now seeing the consequences of ignoring our own farm philosophy when we resorted to off-farm inputs to correct a phosphate deficiency.

Walki Biodegradable Mulching Paper

New Biodegradable Mulching Paper

Views of any and all modern farming stir questions for me. The most common wonder for me has been ‘how come we haven’t come up with a something to replace plastic?’ It’s used for cold frames, hotbeds, greenhouses, silage and haylage bagging and it is used for mulch. That’s why when I read of this new Swedish innovation in specialized paper mulching I got the itch to scratch and learn more. What follows is what we know. We’d like to know more. LRM

Soil, Vegetation, and Acidity

From Dusty Shelves: Audels Gardeners and Growers Guide teaches us about soil acidity.

Starting Seeds

From Dusty Shelves: A WWII era article from Farming For Security

Cultivating Questions

Cultivating Questions: Concerning the Bioextensive Market Garden

One of our goals when we first started farming here was to develop the farm as a self-contained nutrient system. Unlike the almost complete recycling of nutrients which can take place on a livestock operation, we are always amazed – even a little disturbed – to see how many tons of fertility and organic matter leave the market garden each year with so little returned to the good earth.

Asparagus in Holland

Asparagus in Holland

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The asparagus culture in Holland is for the majority white asparagus, grown in ridges. This piece of land used to be the headland of the field. The soil was therefore compact, and a big tractor came with a spader, loosening the soil. After that I used the horse for the lighter harrowing and scuffle work to prevent soil compaction. This land lies high for Dutch standards and has a low ground water level, that is why asparagus can grow there, which can root 3 foot deep over the years.

Purslane, Portahoopies and Plow Planted Peas

Purslane, Portahoopies and Plow Planted Peas

For those not familiar with this tasty, nutritious weed, purslane can be a real challenge to manage in vegetable crops for a number of reasons. The seeds of this weed remain viable for many years in the garden, and generally do not germinate until hot weather — that is, after many of the market garden crops have already been planted. To make matters worse, this succulent plant often reroots after cultivation. Purslane also grows so close to the ground that it is impossible to control by mowing.

Cultivating Questions Winterkilled Cover Crops for a Mild Climate Part 2

Cultivating Questions: Winterkilled Cover Crops For A Mild Climate Part 2

Finding just the right cover crop-tillage combination for crops planted the last half of June has always been a real challenge in our location. While surface-tilling mature rye and vetch in May works well for fall crops established in July and August, this cover crop-tillage combo does not allow enough time for decomposition and moisture accumulation for end-of-June plantings.

Syrup From Oregons Big-Leaf Maple

Syrup From Oregon’s Big Leaf Maple

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There is a great potential in establishment of a seasonal “sugarbush” industry for small farmers of the northwestern states, particularly western Oregon and Washington. Five syrup producing species of maples are found mainly east of the Rocky Mountains. The Box Elder and the Big-leaf Maple are the only syrup producing maples of the Pacific Northwest. Properly made syrup from these two western maples is indistinguishable from the syrup of maples of the midwestern and northeastern states.

Fjordworks: Horse Powered Potatoes

Fjordworks: Horse Powered Potatoes

This is the account of how one farm put more horse power into the planting, cultivation, and harvesting of its potato crop. Ever since we began farming on our own in 1994 one of our principle aims has been the conversion of our farm operation to live horse power wherever feasible. This has meant replacing mechanized tools such as tractors and rototillers and figuring out how to reduce human labor as we expanded upon the labor capacity of our work horses.

Low Tillage Radish Onions

Low Tillage Radish Onions

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The radishes came up quick, filling the garden canopy completely that fall, and the following spring we found the plot was clean of weeds and rows of open holes were left where the radish roots had been growing. Well, we had a few extra onion plants that spring and decided to plant them in these holes, since we already had very clear lines laid out for us and a clean seedbed. What we got were the best looking onions that have ever come out of our gardens.

Apple Cider Autumns Nectar

Apple Cider, Autumn’s Nectar

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While autumn’s beauty is food for our souls, autumn’s harvest provides food for our tables. Along with the many hours and days of canning and freezing our garden produce, harvest time also means apple cider making for our family. We have been making apple cider, or sweet cider as it is commonly called, for six years. Beginning slowly, the demand for our juice has resulted in a production of over six hundred gallons this year.

Marketable Cover Crops

Marketable Cover Crops

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Our cover crops have to provide the benefits of smothering weeds, improving soil structure, and replenishing organic matter. They also have to produce some income. For these purposes, we use turnips, mustard and lettuce within our plant successions. I broadcast these seeds thickly on areas where cover crops are necessary and let them do their work.

Planting Calendar and Other Diagrams

From Dusty Shelves: A 1943 calendar for seeding your vegetable garden.

Small Farmer's Journal

Small Farmer's Journal
PO Box 1627
Sisters, Oregon 97759
800-876-2893
541-549-2064
agrarian@smallfarmersjournal.com
Mon - Thu, 8am - 4pm PDT