WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Sunday, March 25, 2018


Browse on keywords: legume green manure black medic

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Search results on 03/25/18

2015. Foulds, W.. 1978. Response to soil moisture supply in three leguminous species. I. Growth, reproduction and mortality.. New Phytol. 80:535-545..
The study compared white clover, birdsfoot trefoil, and black medic under conditions of high and low soil moisture. Black medic exhibited the most plasticity to moisture condition. On moist soils, it formed substantial vegetative growth and high numbers of seed. In drought conditions, it was the most tolerant at all growth stages, forming many seeds even when vegetative growth was low. Seeds per plant at high and low moisture were 80,000 and 3000 respectively. Competition by perennials during black medic seedling growth seriously inhibits the colonization of this species. Both the immature and adult stages of black medic show an effective avoidance of desiccation.

4921. Oien, David. no date. Black medic information packet.. Timeless Seeds, RR 3 Box 461, Conrad, MT 59425.
This packet is sent to growers who purchase seed. The seeding rate is recommended at 8-10 lb/ac, planted 1/2" deep into a firm seedbed. Field trials have indicated successful medic establishment with barley, oats, spring wheat, and flax as nurse crops, but a second year of medic growth is then necessary for adequate seed production. On-going experiments in Montana (Jim Sims, MSU) are examining several rotations: medic-cereal, sweetclover-cereal, fallow-ceral, and continuous cereal, with different nitrogen rates. Results indicate that the green manures used 1-3" more soil moisture than the other treatments. Wheat yields after medic and sweetclover (25 bu/ac) were significantly higher than all other treatments. An herbicide screening tested a number of alfalfa herbicides on black medic. Poast, Fusilade, Treflan, and Kerb did not injure medic, while paraquat, Pursuit, and 2,4-DB ester caused minor injury. Solicam provided the best overall weed control with little injury to the medic.

8637. Goldstein, Walter. 1990. personal letter. MFAI, 3293, Main St., E. Troy, WI 53120.
Goldstein suggests that biennial black medic performs better in areas with milder winters (WA, KS, NE) than in North Dakota. The variety Virgo from Denmark seems more vigorous and competitive with weeds than the annual black medic from Montana. Instead of medic, some Midwest farmers are using biennial sweet clover aas a self-seeding legume green manure. They allow it to volunteer in winter wheat in March, grow it out the following year or fallow the clover ground, and then plant milo.

9894. Cramer, C.. 1987. Water saving 'weed' replaces chem-fallow.. The New Farm, Sept/Oct 1987, p. 28-29..
Black medic is successfully being used in Montana as a reseeding annual legume in dryland rotations. The medic is protecting the soil from erosion, improving soil structure and water-holding capacity, disrupting weed and disease cycles, and reducing saline seep. Becauce medic is a shallow-rooted legume, it is supplying the soil with added nitrogen but only drawing water from the top 2 feet of the soil profile. This moisture is replaced by snow melt. The medic can also be a profitable hay crop.

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