Our farm runs on compost.  We source our compost from a local organic vegetable farm that uses cow, horse, and rabbit manure, leaf mulch, straw, chopped cover crop and vegetable scraps as the base.  We apply compost each fall before we plant the garlic bulbs.  In the Spring, compost tea is prepared for an additional boost of nitrogen.  Garlic loves nitrogen.  Without the use of pesticides and herbicides, a crop rotation and green manure program is key to success.  Each plot is planted in garlic once every three years.  During the off years, a succession of green manure crops are planted.  The green manure crops fix nitrogen to the soil and when turned in, add organic matter.  And because there is constant rotation, pests are kept in check.  The result is quality garlic and an ecosystem that continues to improve each year.