Manure can be considered the original fertilizer and an important component for those wishing to practice organic gardening. The most common sources of manure are cows, horses, sheep, pigs, goats, and poultry. By using manure you will be adding important micro and macronutrients to your soil that will be slowly released over time, improve soil aeration and water retention thereby building good soil structure and texture. Having good soil also offers supportive system for beneficial soil organisms and earthworms. Furthermore using manure means you are recycling which removes dependency on chemical fertilizers.