Drill 1/4 to 1/2 inch deep (using a double-disk or hoe-type drill) into a firm seed bed as you would for alfalfa. With timely moisture, you can get a hay cutting within nine to 10 weeks after germination, and some species will keep working to produce a second cutting. So which ones are for you? Livestock graze the legume in the “medic years” when the cover crop accumulates biomass and contributes N to the soil. Most upright varieties resemble alfalfa in their seeding year with a single stalk and short taproot. However, beyond seed selection, cover crops are cover crops. N/A when interplanted with standard and semi-dwarf barley in a Minnesota trial. Good stands of medics in well drained soil can contribute sufficient residue to build soil organic matter levels. In California orchards and vineyards where winters are rainy instead of frigid, medics mixed with other grasses and legumes provide a continuous cover that crowds out weeds. Significant annual types include: burr medic (M. polymorpha), which grows up to 14 inches tall, is semi-erect or prostrate, hairless, and offers great seed production and N-fixing ability; barrel medic (M. truncatula), about 16 inches tall, with many mid-season cultivars; and snail medic (M. scutellata), which is a good biomass and N producer. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. Annual Medic Cultivars. In studies in several states, the native medic successfully reseeded for at least two years when growth was terminated two weeks after TIBBEE bloomed. Fall weeds are controlled by medic regrowth after harvest, whether the medic stand is overseeded or interplanted with the grain, or the grain is seeded into an established medic stand. The legume germinated, but didn’t grow well or provide weed suppression until after corn dry-down in mid-September. It can improve soil, reduce diseases, save moisture and boost grain protein when grown in rotations with grains in the Northern Plains. “The yield drop with medic was mostly a weed problem with Persian darnel,” Alger explains, “but I now have that mostly under control.”. USDA is an equal opportunity provider and employer. Once established, few other legumes outperform medics in soil-saving, soil-building and—in some systems—forage, when summer rainfall is less than 15 inches. 1. Further, the long-lived seed bank that black medic establishes may be undesirable for some cash crop rotations (383). It is extremely impor-tant to seed when there is enough light to germinate and establish the cover crop, yet late enough so it will not compete with the corn crop for water, nutrients or light. fail due to droughty conditions (422) if there is at least 12 in. Herbicides found compatible with annual medics include 2,4-DB, Eradicane, Buctril before medic emergence, Basagram and Pursuit on IR corn. Use in any size of garden in the late summer or early fall (after harvest) in northern areas and at any time in the South. There are at least 10 cultivars of barrel medic. It uses less water in the 2- to 4-foot depth than sweetclover, soybeans or hairy vetch seeded at the same time. They grow quickly in response to fall California rains and fix from 55 to 90 lb. Medics in the vegetative stage do not tolerate field traffic. Photo by Bob Bugg. Annual medics include 35 known species that vary widely in plant habit,maturity date and cold tolerance. Selected cultivars include SERENA (an early bloomer), and CIRCLE VALLEY, both of which have fair tolerance to Egyptian alfalfa weevil (435). All the covers were clear (sole-crop) seeded in early May after pre-plant incorporated herbicide treatment, and were plowed down 90 days later. By allowing the cover crop to grow until 40 to 50 days after first bloom and managing the cropping system without tillage that would bury burclover seeds too deeply, Southern spotted burclover should successfully reseed for several years. N/A (141). It is susceptible to pea aphid. It depends on a farmer’s goals. Southern Spotted Burr Medic Offers Reseeding Persistence. Pest Management Under water logged conditions for which they are ill-suited, annual medics are susceptible to diseases like Rhizoctonia, Phytophthora and Fusarium. Regrowth comes from lateral stems, so don’t clip or graze lower than 4 or 5 inches if you want regrowth. Grows well in dryland, alkaline (6.8-9.0 pH) soils, and is often used for over-seeding into existing pasture grass, or cover cropping in orchards, vineyards, or grains. Native medic seed is being increased in cooperation with the USDA -Natural Resources Conservation Service’s Jamie Whitten Plant Materials Center, Coffeeville, Miss., for possible accelerated release to seed growers as a “source-identified” cover crop. Annual medics overseeded into row crops or vegetables can be grazed in fall after cash crop harvest (376). The Cover Crop Chart was generated with input from producers and technicians in the Area IV Soil Conservation Districts of North Dakota and NRCS staff at the Bismarck and Dickinson Field/Area Offices. This mix contains broadleaf and grass species, providing diversity and a balanced diet for livestock. Up to 96 percent of it is hard seed, much of it so hard seeded that it won’t germinate for two years. That’s GEORGE black medic. A local accession collected in northern Mississippi exhibits better cold hardiness and insect resistance than commercially available (Australian) annual medics. He is experimenting successfully with rye instead of summer fallow. On-farm tests showed he got 87 lb. Annual medics (Medicago spp.) Medics can survive in summer drought-prone areas where few other cultivated forage legumes would, thanks to their hard-seeded tendency and drought tolerance. “It was already laying over, but the pickup guards on my combine helped to gather in about half the seed.” The other half pumped up the seed bank for years ahead. Green plants, dry plants and burs of burr medic provide good forage, but solid stands can cause bloat in cattle (422). In a replicated cold-hardiness trial spanning several states, spotted burr medic flowered in mid-March, about two weeks after SERENA, CIRCLE VALLEY or SANTIAGO burclover, but two weeks before TIBBEE crimson clover. Working with nature, cover crop seeds, mixes and EnviroPastures.Regenerative Farming New Zealand. Easy-to-manage cover crop. It is well suited to cold winter areas of Hardiness Zone 4, where it can stay green much of the winter (6). Medics can establish and survive better than subterranean clover in times of low rainfall, and are more competitive with grasses. If weed pressure is high, medic fields are grazed closely to prevent weeds from going to seed, then plowed. Annual MOGUL produced the most biomass by fall, but also reduced barley yields. Cover crops have become one of the ag industry’s most exciting and valuable trends in recent years, and for good reason: Covers have been shown to build healthy sustainable soil and contribute to higher crop productivity. All the medics re-established better under permanent pasture than under any rotational system involving tillage (94, 422). Boost organic matter. Cool season legume cover crop. Green manures provide living mulch that protects soils from winter erosion. of rain per year (292). Also called: black medic, burr (or bur) medic, burclover Type: Winter annual or summer annual legume Roles: N source, soil quality builder, weed suppressor, erosion fighter Mix with: Other medics; clovers and grasses; small grains See charts, p. 66 to 72, for ranking and management summary. Spring -planted annual medics produced dry matter yields similar to or greater than alfalfa by July (373, 376). The two legumes in the mix were crimson clover (Trifolium incarnatum) and hairy vetch (Vicia villosa). For a ley pasture in crop-pasture rotation, the emphasis is on snail medics with only a small amount of barrel medic, with a mixture of the early-, mid-, and late-season flowering cultivars to take advantage of different length of seasons. Although annual medics are relatively new in North America, they are an essential component of Australian sheep pastures and small grain cropping systems. 4. GEORGE grows in a prostrate to ascending fashion and overwinters well with snow cover in the Northern Plains. Widely acclimated. You will, of course, use different varieties for best results. Annuals are great if we’re going to till in the cover crop or follow the cover crop with something else. Nitrogen production was 66 lb./A for MOGUL, 46 for SAVA and 22 for SANTIAGO. Up to 90 percent has an outer shell that resists the softening by water and soil chemicals that triggers germination (286). To avoid bloat, manage as you would alfalfa (201). Medics or subterranean clover pastured for several years on Australian dry-lands help to store moisture and build up soil productivity for a year of small grain production before being returned to pasture. As soil concerns vary from farm to farm, cover crops are selected and customised accordingly – often ticking more than one box. Establishment options vary depending on climate and crop system: Killing Medics are easy to control by light tillage or herbicides. The big advantage of spotted burr medic over crimson clover was its ability to reseed for several years from a single seed crop. Pods and viable seeds develop without pollinators because most annual medics have no floral nectaries (120). Seeding as hay or forage crop: Annual medics can be 'clear-seeded' in early spring as a hay or forage crop with a small-grain drill. In a series of trials in Ohio, Michigan, Wisconsin and Minnesota, medic sometimes reduced corn yield and did not provide enough weed control or N to justify its use under current cash grain prices, even when premiums for pesticide- free corn were evaluated (141, 219, 373, 374, 376, 456, 457). Three cover crop categories exist: Grasses like cereal rye and Sudan grass; brassicas like turnips, radishes, and rapeseed; and legumes like hairy vetch and clover. Medics earn a place in dryland crop rotations because they provide N while conserving moisture comparable to bare-ground fallow (230, 380). Only balansa clover (see Up and Coming Cover Crops) reseeded as well as spotted burclover (105). In a California pasture comparison of three annual medics, JEMALONG barrel had the highest level of seed reserves in the soil after six years, but didn’t continue into the seventh year after the initial seeding. Jess continues to fine-tune his system to maximize income and weed management. The above image shows black medic, a self-seeding legume, regenerating under a flax crop. It frequently reduced barley yields, particularly those of a semi-dwarf barley variety, but increased weed suppression and N and biomass production (289). The medic/wheat interplant yielded 29 bushels per acre—six bushels less than the other field. See also Self-Seeding Cover Crops for Late Seas… Our SmartMix calculator creates a custom cover crop mix that’s just right for your field. Black medic has a high percentage of hard seed. No one ought to try to grow mustard as a cover crop in 100ºF weather! Medics are widely adapted to soils that are reasonably fertile, but not distinctly acid or alkaline. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. dry matter/A from a springs own barrel medic (164). mix or the control. He let it mature to its full 12 inches to harvest it for seed. Johnny's offers the convenience of precombined cover crop seed mixtures for both spring and fall planting. GEORGE was the least competitive and fixed 55 to 120 lb. However, in Michigan trials over several years, SANTIAGO (a burr medic with no spines on its burs) failed to establish satisfactorily when it was overseeded into corn and soybeans at layby. serious pest of bur medic. They branch profusely at the base, and send out prostrate stems that grow more erect in dense stands (422). The more prostrate species of annual medic provide better ground cover. GAMMA medic (M. rugosa) had the highest first-year seed production but re-established poorly, apparently due to a low hard seed content. Black medic is palatable to livestock and has fair forage value. Reseeding. This information is for educational purposes only. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Quick germination and maturity can lead to three crops (two reseedings) in a single season from a spring planting in the Midwest (373). One Michigan farmer’s situation is fairly typical. N/A. Establishment Annual medics offer great potential as a substitute for fallow in dry northern regions of the U.S. with longer day length. Producers in Europe, North Dakota, and Canada have already experimented with black medic as a cover crop. Sustainable Agriculture Research and Education. Tolerate regular mowing. Naturalized and imported burr medic proved the best type of burclover for self-reseeding cover crops in several years of trials run from northern California into Mexico in the 1990s. Black medic is a dual-use legume in this adapted “ley” system. Black medic can germinate within three days of planting (286). In the mid-Atlantic at the USDA Beltsville, MD. These insects are easily controlled with pyrethroid insecticides when weevils are in their second instar growth stage. Medics can produce more than 100 lb. April soil N value after black medic in one Montana test was 117 lb./A, about 2.5 times the fallow N level and the best of six cultivars tested, all of which used less water than the fallow treatment (378). Early planting in this window with a late frost could give both forage and N-bearing residue, protecting soil and adding spring fertility. Blogger and seed manager Jenna Langley Blue dives into cover crop varieties and how they relate to soil health . Seeding rate is 8 to 10 lb./A for black medic, 12 to 20 lb./A for larger-seeded (snail, gamma and burr) annual medics. MSU is an affirmative-action, equal-opportunity employer. Although annual medics are relatively new in North America, they are an essential component of Australian sheep pastures and small grain cropping systems. These mixes can be used as a green manure incorporated into the soil or to provide winter erosion control. Cover crops can also help control unwanted plant-parasitic nematodes that damage crop production. In another Michigan comparison, winter canola (Brassica napus) yields were similar after a green manure comparison of two medics, berseem clover and NITRO annual alfalfa. Snail medic produced about the same biomass and N as red clover when both legumes were spring sown with an oats nurse crop into a disked seedbed in Wisconsin. Insect pests such as clover leaf weevil (Hypera punctata Fabricius) and the alfalfa weevil (Hypera postica Gyllenhal) preferentially attack medics over other winter legume cover crops in the Southeast, and could jeopardize seed production. Low, dense vegetation breaks raindrop impact while roots may penetrate 5 feet deep to hold soil in place. The medic put on about 10 inches of growth before winterkilling, enough for effective winter erosion protection (201). Black medic increased spring wheat yield by about 92 percent compared with spring wheat following fallow, and also appreciably raised the grain protein level (379). Livestock graze the legume in the “medic years” when the cover crop accumulates biomass and contributes N to the soil. Reduce soil erosion. Table 1 shows the growth characteristics, use and seeding rates of some annual medics that have been tested. This site is maintained by SARE Outreach for the SARE program and is based upon work supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award No. A month of summer grazing improves the economics of rotation by supplying forage for about one animal unit per acre. He established annual medic at 10 lb./A when his ridge-tilled corn was about knee high. They not only help control erosion; they also provide key nutrients. Researchers suspect the crop canopy shaded the medic too soon after planting, and that earlier overseeding may have allowed the medic to establish. Cover crop mix has legumes, hardy grains, radish, mustards – to help heal your garden from all the growing you are doing! Most cover crop blends contain a mix of N-fixers and non-N-fixers. However, since our Local environmental variations, such as sandy or clay soils with differing soil nutrient availability or drain-CHapter 2 Cover Crop Species and Descriptions Chuck A. Ingels, Robert L. Bugg, and Fred L. Thomas Monocultures versus Mixes, 8 Winter annual Cover Crops for Tilled Vineyards, 13 Legumes, 13 grasses, 16 forbs, 17 This cover crop mixture is a high attraction option to plant after corn or soybeans. This makes medics ideal for long rotations of forages and cash crops in the Northern Plains and in cover crop mixtures in the drier areas of California. In this system, established self-reseeding black medic plowed down as green manure in alternate years improved spring wheat yield by about 50 percent compared to fallow (380). in the Northern Plains and in cover crop mixtures in the drier areas of California. Medics may survive where true clovers (Trifolium spp.) Most upright varieties resemble alfalfa in their seeding year with a single stalk and short taproot.Medics can produce more than 100 The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. semi-erect, late maturing, good cold tolerance, prostrate, mid-maturing, some cold tolerance, erect, early maturing, some cold tolerance, semi-prostrate, early maturing, unknown cold tolerance. All cover crops significantly reduced nitrate-N accumulations in Iowa State University (ISU) trials. In the arid Northern Plains, fall germination and winter survival are dependable, although spring planting also has worked. STANFORD, Mon.—Jess Alger can count on 13 inches of rainfall or less on his central Montana farm, occasional hail damage, too few solar units to raise safflower or millet, some bone-chilling winters without snow cover— and George. In a Michigan test of forage legumes for emergency forage use, MOGUL barrel medic produced 1.5 T dry matter/A compared to about 1 T/A for SAVA snail medic and SANTIAGO burr medic (M. polymorpha). Scarified seed will achieve 95 percent germination, and 10-year old raw seed may still be 50 percent viable (422). Reduced Soil Erosion. Winter-annual clovers and medics are key ingredients in … Berseem clover may be a better choice in many situations. He had several inches of growth when frost hit about June 10 and killed the tender grass. In dryland areas, most legumes offer a choice between N production and excessive water use. The plants stayed green until the temperature dipped to the upper teens (201). Their status as a resilient, reseeding forage makes medics the basis for the “ley system” developed in dry areas of Australia. Our expert sales team will work with you to create a custom cover crop mix that is just right for your field and your goals. Using hot weather cover crops is very similar to using cool weather cover crops. The taller barley was more competitive, indicating that taller small grain cultivars should be used to favor grain production over medic stand development (289). As an interseeded crop: Medics can be grown as companion crops or interseeded with corn, sugarbeet and wheat. Dates of first flowering for barrel medics range from 80 to 105 days after germination, and seed count per pound ranges from 110,000 for HANAFORD to 260,000 for SEPHI (422). Rolling is recommended before or after seeding to improve seed-soil contact and moisture in the seed zone. N/A where the plants grow over winter. Contact a Sales Rep today to get started! An early August seeding of the annuals in southern Illinois germinated well, stopped growing during a hot spell, then restarted. A cover crop’s definition is broad. The burr medic cultivar CIRCLE VALLEY successfully reseeded in a Louisiana no-till cotton field for more than 10 years without special management to maintain it (103). site, medics have been difficult to establish by over-seeding at vegetable planting or at final cultivation of sweet corn. GEORGE black medic is prostrate, allowing other grasses and forbs to become the overstory for grazing. Seed of the different medic cultivars are normally mixed. With easy-to-use educational resources, we help you identify the strengths and weaknesses of your selections and craft a mix that will serve you well. In North Dakota, however, unrestricted medic growth depressed yield of a following wheat crop (73). Cover crops provide many benefits, but they’re not do-it-all “wonder crops.” To find a suitable cover crop or mix of covers: Clarify your primary needs; Identify the best time and place for a cover crop in your system; Test a few options; This book makes selection of cover … They germinate and grow quickly when soil moisture is adequate, forming a thick ground cover that holds soil in place. Acid-tolerant rhizobial strains may help some cool-season medics, especially barrel medic, to grow on sites that otherwise would be inhospitable (422). Use of medics for grain production in the upper Midwest has given inconsistent results. Perennial medics are self-reseeding with abundant “hard seed” that can take several years to germinate. Annual medics can achieve their full potential when planted after a short-season spring crop such as processing peas or lettuce. He became certified organic in 1999. Managing Cover Crops Profitably, 3rd edition, Selecting the Best Cover Crops for Your Farm, Building Soil Fertility and Tilth with Cover Crops, Managing Cover Crops in Conservation Tillage Systems. N/A, nearly as much as true clovers (294, 422). SARE Outreach operates under cooperative agreements with the University of Maryland to develop and disseminate information about sustainable agriculture. Sudan grass medic mix L egumes and grasses are fast-growing ground cover crops that provide an alternative to animal manure as fertilizer to amend and improve the soil. Millet and tillage radish will provide early summer feed, while sorghum and rape will provide late summer and autumn feed. To reduce economic risk in fields where you’ve never grown medic, sow a mixture of medics with variable seed size and maturation dates. Otherwise, he no-tills winter wheat into standing medic so he can leave most of the medic in place, bury less seed and allow GEORGE to rest more securely in his field. 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