[{"question":"What is vetch and what types are available?","answer":"Vetch (Vicia) is a nitrogen-fixing legume used primarily as a cover crop and green manure. Two main types are available: common vetch (Vicia sativa), a spring-planted annual that matures in one season, and hairy vetch (Vicia villosa), a winter-hardy variety that can be fall-planted in zones 4-8 and overwinters to provide spring growth. Both types are vigorous vining plants that fix 80-200 lbs of nitrogen per acre and produce substantial biomass for soil improvement."},{"question":"When is the best time to plant hairy vetch?","answer":"Plant hairy vetch in late summer to early fall (August-September) for winter cover and spring nitrogen production. Fall planting allows 4-6 weeks of establishment before frost, after which hairy vetch goes dormant and resumes vigorous growth in spring. In zones 3-4, plant by mid-August to ensure adequate establishment. Hairy vetch can also be spring-planted (April-May) but produces less biomass and nitrogen when used as a spring annual."},{"question":"How much nitrogen does vetch fix per acre?","answer":"Hairy vetch fixes 80-200 lbs of nitrogen per acre, with typical stands providing 100-150 lbs N. Common vetch fixes slightly less at 60-150 lbs per acre. When terminated and incorporated in spring, vetch provides enough nitrogen to significantly reduce or eliminate nitrogen fertilizer for the following crop. Research shows vetch cover crops can supply 50-80% of corn's nitrogen requirement when properly managed."},{"question":"What is the seeding rate for vetch?","answer":"Seed hairy vetch at 15-25 lbs per acre as a pure stand, or 10-15 lbs per acre when mixed with a cereal grain (winter rye, oats, or wheat). Common vetch is seeded at 30-40 lbs per acre due to its larger seed size. For small areas, use approximately 0.5-1 lb per 1,000 sq ft. Plant 0.5-1 inch deep. Inoculate with Rhizobium leguminosarum inoculant specific to the vetch/pea group."},{"question":"Can vetch be mixed with winter rye as a cover crop?","answer":"Yes—hairy vetch and winter rye is one of the most effective cover crop combinations. Winter rye provides fast fall establishment, winter erosion control, and a physical structure for vetch to climb. Vetch provides nitrogen fixation that winter rye cannot. Together, they produce more biomass and nitrogen than either crop alone. Typical mix rates are 15 lbs vetch + 30-40 lbs winter rye per acre, planted in September-October."},{"question":"Is vetch winter-hardy? Will it survive cold temperatures?","answer":"Hairy vetch is winter-hardy through USDA zones 4-8, surviving temperatures to -15°F once established with adequate fall growth. Common vetch is less cold-tolerant, surviving to about 10-15°F (zones 6-9). In zone 3, hairy vetch survival is inconsistent—adequate fall establishment (6+ weeks before frost) and snow cover are critical. A companion crop of winter rye provides additional cold protection by trapping snow and reducing wind exposure."},{"question":"How do you terminate vetch before planting a crop?","answer":"Terminate vetch by mowing, rolling with a crimper-roller, or tilling at full bloom stage (typically late May to early June). Crimper-rolling is preferred for no-till systems—it kills vetch without soil disturbance and creates a weed-suppressing mulch mat. Herbicide termination with glyphosate is effective when applied at early bloom. Avoid terminating too early (before bloom), as nitrogen fixation peaks during flowering and early termination reduces nitrogen contribution by 30-50%."}]
