It will be ready in 6 months to a year. Animal manures are excellent. They should be well rotted, applied in the fall and plowed under. Weed seeds are the chief objection to using animal manures. Peatmoss, compost or animal manure should be applied to the soil surface to a depth of about 2 inches, then worked in thoroughly.
Green manures are legumes or small grain crops that are plowed under while still in the green stage.
Winter green manure crops include rye, wheat, barley and winter vetch. Summer green manure crops include Sudan grass, soybeans and cowpeas. An excellent way to handle the organic matter problem on farms is to plant half of the garden to a winter green manure crop in September or early October, then put some well-rotted animal manure on the other half, fall plow it, and plant spring vegetables in this part. The following spring, turn under the green manure crop, and plant your summer vegetables. Rotate these areas each year.