To improve the soil quality, the farm began making its own fertilizer from cow manure. The fertilizer complies with organic certification requirements because the manure comes from a neighboring dairy farm that feeds its cows alfalfa and corn silage and has the milk tested for antibiotic residues. With manure from pigs or chickens there would be more reason to worry about toxic traces of antibiotics or heavy metals.
為了改善貧瘠土質，農場自己製作牛糞有機肥，因為附近酪農以苜蓿芽、玉米葉為餵食飼料，而乳牛生產的牛奶也必須進行抗生素殘留檢驗，等於有了嚴格把關，不像豬糞或雞糞可能有抗生素或重金屬殘留的疑慮。