key growing information

Spring Green Manure Mix | Key Growing Information

How to grow the spring green manure mix of peas, oats and hairy vetch: benefits, sowing season, soil, inoculation, depth and rates, and managing residue.
By Hensley’s Seed Co.

Spring Green Manure Mix - Key Growing Information

Green manures are specific plants, crop varieties, or mixes that are grown and turned into the soil to improve overall quality, particularly fertility and tilth.
Uses: A quick-growing cover crop for any season that does especially well in spring. Its blend of peas, oats and hairy vetch fixes nitrogen, builds plenty of biomass and smothers weeds.
Culture: Sow any time from spring to late summer, though cool weather is best. It prefers full sun, well-drained soil and a pH of 6.0–7.0, but can still do well in less ideal spots. For the most growth and nitrogen fixation, inoculate with a pea/vetch inoculant. Plant ¾–1" deep and cover the seed fully; on a larger scale, drill it or broadcast and harrow lightly.
Seeding Rate: 5 lb. per 1,000 sq. ft.; 200 lb. per acre.
Height: 24–36"
Termination: For green manure, till it under while still vegetative, since the oats and vetch are harder to work in once they flower. At that point, crimp or mow to leave a surface mulch, or wait 2–3 weeks after mowing before tilling. On a small scale, tarping after mowing or crimping handles the residue well. From a late-summer sowing, the peas and oats winter-kill and the vetch regrows in spring, when it can be mowed and turned under.

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