If small grain must be planted before frost, consider choosing an alternative small grain. Spray solutions for Gramoxone can be water, nitrogen solution, or clear fertilizer solutions and must contain a nonionic surfactant. A seeding rate of about 20 to 30 pounds of hairy vetch per acre is recommended. SmartMix is the best cover crop decision making tool in the industry. However, do not delay corn planting to allow additional growth of legume cover crops. by Eric Sideman, Ph.D. This extra surface residue accumulation can benefit subsequent crops, but it should be evaluated to determine whether it inhibits crop growth or encourages pests or diseases. Corn yields in the piedmont are lower after small grain silage removal compared to leaving the small grain as mulch. Use 11⁄2 to 21⁄2 pints of Gramoxone Super per acre or 11⁄2 to 2 quarts of Roundup per acre. Growing Organic Hairy Vetch Cover Crop Garden Seeds. For both hairy vetch and Cahaba white vetch, the rates are 20 to 30 pounds per acre broadcast and 15 to 20 pounds drilled. Vetches have the ability to offer substantial improvements in soil fertility, structure and organic matter as well as offering a weed and disease break for cereals in a crop rotation. Hairy vetch has consistently performed well in these trials, and crimson clover is also promising on well-drained sites (Figure 2; Table 3). It is essential that cover crop vegetation be thoroughly and uniformly sprayed for effective control. There are other types of vetch plants, but hairy vetch is most widely used in farming. Cooperative Extension. Higher seeding rates and sowing in nutrient deficient fields can aid Woollypod vetch in weed suppression. Common vetches are an annual pasture/forage/grain legume, extremely palatable at all growth stages, from early green shoots, as dry matter/hay or silage through to seedpods and seeds over summer. The use of a starter fertilizer will ensure faster initial growth. With a small grain cover crop, killing it seven to fourteen days before corn is planted can reduce potential soil water depletion. Due to its low C:N ratio, the plant material readily breaks down after termination. Although crimson clover, hairy vetch, Austrian winter pea, and common vetch are widely adapted to soil and climatic conditions in North Carolina, they do have some limitations. Two or more cover crop species can be combined in a single planting to realize the benefits of each. All of these plants have similar heights, so deleterious shading would be at a minimum compared to using taller rye and shorter crimson clover. Hairy vetch is better adapted to more sandy soils and to more poorly drained soils than crimson clover, although crimson clover provides adequate dry matter production on most well-drained sandy loams. This vetch has been observed to produce more biomass than many other vetches and fixation of N could even start within a week of emergence. Some producers may find the late maturity of WinterKing reduces the potential for undesired seed propagation found in earlier maturing cover crop varieties. This vetch has been observed to produce more biomass than many other vetches and fixation of N could even start within a week of emergence. The ideal temperatures for early root growth range from 20° to 25° C (68° to 77° F). For corn following a small grain cover crop, special consideration must be given to fertilization, especially with regard to the N source, placement, and timing of application. Plowing cover crops under early in the spring will increase the decomposition rate of the cover crop, but this early termination date also limits cover crop growth, which limits nutrient accumulation and the buildup of soil organic matter from the residue. 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